Sample MCQ Question Bank

Material Science

Sample Multiple Objective Questions for Unit I, II, II &IV

1

Iron is

A. Ferromagnetic B. paramagnetic C. ferroelectric D. dielectric

A

2

Dies for wire drawing are now-a-days made of

A. Cast iron B. mild stel C. stainless steels

D. carbides

D

3

A reversible change in the atomic structure of the metal with the corresponding change in the properties of the steel is known as

A. Iscentropic change B. Polytropic change

C. Allotropic change D. Thermodynamic change

C

4

Dies for wire drawing are generally made of

A. Cast iron B. mild steel C. high carbon steel D. carbides

D

5

The ability of a material to resist softening at elevated temperatures is known as

A. Extended hardness B. Hot hardness C. Super heating D. Super hardening

B

6

In iron-iron carbide diagram the abscissa is

A. Time B. Temperature C. Carbon percentage

D. Iron percentage

C

7

The main alloy for corrosion resistance in steel is

A. Carbon B. Chromium C. Sulphur D. Manganese

B

8

Stress concentration occurs when

A. A body is subjected to excessive stress

B. A body is subjected to fluctuating stress

C. A body is subjected to reversing stress

D. A body is subjected to non-uniform stress distribution

D

9

A material which undergoes no deformation till it’s yield point isnot reached and then it flows at constant stress is known as

A. Rigid B. Elastic C. Plastic D. Rigid-plastic

D

10

Which of the following structure of steel has got the maximum hardness ?

A. Pearlite B. Sorbite C. Martensite D. Troosite

C

11

The principal property of a refractory material is it’s

A. High density B. high melting point C. high electrical resistance D. high tensile strength

B

12

The ability of a material to absorb large amount of energy is

A. Ductility B. resilience C. toughness

D. malleability

B

13

Steel having ferrite and pearlite are

A. Soft B. Hard C. Malleable D. Ductile

A

14

Files used for fitting work are made of

A. Cast iron B. Mild steel C. stainless steel

D. High carbon steel

D

15

Cold work is done on metals

A. Below thermal critical range

B. Above thermal critical range

C. At temperature below zero degree centigrade

D. After slightely warming up the metal in furnace

A

16

Dislocations are

A. Line defects B. planer defects C. chemical defects D. Point defects

A

17

Tensile strength of cast iron is approximately

A. 1.5 tonne/cm3 B. 3.5 tonne/cm3 C. 4.5 tonne/cm3 D. 9.0 tonne/cm3

A

18

Stress concentration may be caused by

A. Change in shape B. change in dimensions C. polishing & painting of surface D. a hole or notch in a body

D

19

In brinell hardness tester if a soft ball is used for indentation

A. The indentation will not be circular

B. The surface of deformation will be rough

C. Ball may get deformed

D. Indentation may be uneven

C

20

Fatigue failure of metals results from

A. High stress B. high temperature C. combined stresses

D. fluctuating stresses

D.

21

Vickers hardness number for diamond is

A. 8400 B. 4400 C. 2400 D. 400

A

22

The maximum percentage of any constituent of 18-4-1 high speed steel is

A. Iron B. Carbon C. Chromium D. Vanadium

A

23

Invar contains

A. 64% iron 36%nickel

B. 64 % iron 36% vanadium

C. 64% iron 36 % chromium

D. 64% iron 36& cobalt

A

24

The percentage of carbon for high carbon steel is

A. 0.55 B. 0.5 to 1.2 C. 1.2 to 2.0 D. 2.0 to 4.0

B

25

The loss of strength in compression due to over loading is

A. Iso-stress B. relaxation C. Hysterisis

D. Bauschinger effect

D

26

Pipes for bycycle frames are made of

A. Cols rolled steel C. hot rolled steel

B. Cast steel D. carbon chrome steel

A

27

The percentage of silicon in silicon steel used in electrical quipement is

A. 0.5 % B. 3.4 % C. 8% D. 15.5 %

B

28

The crystal structure of graphite is

A. HCP B. FCC C. BCC D. none of the above

A

29

For cold work tool steels should have

A. Low wear resistance

B. High wear resistance

C. Toughness

D. Low hardenability

B

30

The ability of material to absorb energy when deformed elastically and to return it when it unloaded is known as

A. Hardness B. Creep C. Toughness D. Resilience

D

31

The property of metals when the recovery after unloading is complete but not instantenious, is

A. Elasticity B. Plasticity C. Anelasticity

D. Visco-elasticity

C.

32

Sparks given off by high speed steel during grinder test are

A. Long streaks B. brilliant C. dull red D. No spark is given by high speed steel

D

33

The behavior of visco-elastic material is

A. Time dependant C. temperature dependant

B. Orientation dependant D. age dependant

A

34

Cast iron contains

A. 0.1 % carbon B. 0.7 % carbon C. 1 to 2 % carbon D. 2 % to 5 % carbon

D

35

Iron is

A. Ferromagnetic B. Paramagnetic C. Ferroelectric D. Dielectric

A

36

The balls used for ball bearings are made of

A. Cast iron B. Cast steel C. stainless steel

D. carbon chrome steel

D

37

The hardness of ball used in Brinell hardness test should be less than

A. 100 VHN B. 250 VHN C. 300 VHN D. 850 VHN

D

38

The dominant alloys in shock resisting tool steels are

A. Chromium, tungsten

B. Carbon, iron

C. Cobalt, nickel

D. Aluminium, copper

A

39

Spring steels should have high resistance to

A. Fatigue B. Deformation C. Shocks D. All of the above

D

40

Boiler plates are made of

A. Alloy steel

B. High carbon steel

C. Medium carbon steel

D. Dead mild steel

D

41

Material used for ball bearing is

A. Mild steel

B. Medium carbon steel

C. Carbon chrome steel

D. Stainless steel

C

42

Wear resistance of a material depends upon

A. Tensile strength C. Elasticity

B. Hardness D. Poisson’s ratio

B

43

Charpy test is conduced to measure

A. Elongation C. Brittleness

B. Hardness D. Fracture stress

C

44

Molybdenum is added in stainless steel particularly to strengthen it against

A. Pitting corrosion

B. Galvanic corrosion

C. Crevice corrosion

D. Erosion corrosion

A

45

In ball bearings the hardness of balls and races is as folloes:

A. Balls are soft, races are hard

B. Balls are hard, races are soft

C. Balls are hard races are also equally hard

D. Inner race is soft, outer race is hard and balls are also hard

C

46

The fatigue strength of materials increases

A. With temperature C. by providing scratches on the surface

B. By providing notches D. by under stressing the material

D

47

After cold forming the steel balls are subjected to

A. Solution hardening

B. Normalizing

C. Artificial aging

D. Stress relieving

D

48

In reinforced concrete steel rods are used to increase

A. Tensile strength C. compressive strength

B. Hoop strength D. shear strength

A

49

Railway springs are made of

A. Dead mild steel C. mild steel

B. Medium carbon steel D. high carbon steel

D

50

Railway rails are made of

A. Medium carbon steel C. dead mild steel

B. High carbon steel D. mild steel

B

51

Which of the following is expected to be strongest in tension?

A. Piano wire C. aluminium wire

B. Brass wire D. stainless steel wire

A

52

When P is the number of phases, f is degrees of freedom and c is number of components in the system, then according to phase rule

A. P+f=c-2 C. p+f=f-2

B. P+f=c+2 D. p+c=f+2

B

53

Steel with 0.8% C and 100% pearlite is called

A. Eutectoid C. Hyper-eutectoid

B. Austenite D. Solidus

A

54

High ductility steel wires are generally made of

A. Alloy steel C. high carbon steel

B. Mild steel D. Dead mild steel

D

55

Process used primarily to obtain surface finish is

A. Soldering C. sintering

B. Lapping D. shot peening

C

56

Which of the following material is least prone to oxidation?

A. Platinum B. steel C. Copper D. cast iron

A

57

Which of the following is expected to have highest percentage of carbon?

A. Structural steel rods

B. Weldable boiler tubes

C. Railway axles

D. Dies for wire drawing

D

58

Steel used for bearing is

A. Mild steel C. carbon steel

B. Carbon-chrome steel D. stainless steel

B

59

Vanadium is added to sttel mainly to increase it’s

A. Fatigue resistance

B. Corrosion resistance

C. Hardenability

D. toughness

A

60

Chiesels are generally made of

A. mild steel C. medium carbon steel

B. mild steel D. high carbon steel

D

61

Which of the following will have least percentage of carbon?

A. High ductility wires

B. Connecting rods

C. Dies and punches

D. Paper knives

A

62

In order to observe the grain size of steel samples under microscope, the magnification should be of the order of

A. 2 B. 10 C. 100 D. 150

C

63

If the structure of a sample consist of pearlite, cement and free carbon, the sample may be

A. Cast iron C. dead mild steel

B. Alloy steel D. eutectoid steel

A

64

Which one of the following is hypo-eutectoid steel

A. 1.75% C steel C. 0.85% C steel

B. 1.2 % C steel D. 0.45 % C steel

D

65

Ferrite is

A. Amorphous and brittle

B. Soft and ductile

C. Hardneable under rapid cooling

D. Present in abundance in high carbon steels

B

66

If steel at room temperature is magnetic, the presence of which constituent can be ruled out?

A. Ferrite B. Pearlite C. Austenite D. Cementite

C

67

The allotropic form of iron not having body centered cubic lattice is

A. Alpha iron B. beta iron C. gamma iron D. delta iron

C

68

Austenite stainless steel contains chromium and nickel in amounts required to assure that even at room temperatures, the steel retain their crystalline structures, which are

A. FCC B. Diamond cubic C. HCP D. partly amorphous

A

69

Which allotropic form of ion is magnetic at room-temperature?

A. Alpha iron B. beta iron C. gamma D. delta iron

A

67

Bauschinger effect is associated with

A. Creep B. austempering C. fatigue D. hardness

C

68

Which of the following is never used as quenching medium?

A. Air B. water C. oil D. petrol

D

69

Above the curie temperature, a magnetic material becomes

A. Ferromagnetic C. diamagnetic

B. Paramagnetic D. none of the above

B

70

Which of the following material will follow Hooke’s law most closely?

A. Mild steel C. cemented tungsten carbide

B. Carbon steel D. soft rubber

C

71

A steel with higher carbon content then the eutectoid composition is known as

A. Hypoeutectoid steel C. super eutectoid steel

B. Hypereutectoid steel D. none of the above

B

72

The ratio of the absolute temperature of a material to its absolute melting temperature , is called

A. Thermal strain C. homologous temperature

B. Absolute strain D. isotropic temperature

C

73

The maximum number of co-exist in a C-component system is

A. C-P+2 B. P(C-1) C. F-C+2 D. C+2

D

74

The degree of freedom when ice, water and vapour co-exist in equilibrium is

A. 1 B. 2 C. 0 D. -1

C

75

The degree of freedom, when FCC iron and BCC iron co-exist in equilibrium are

A. 2 B. 1 C. 0 D. -1

B

76

The phase boundry between alpha and (alpha+beta) regions is called

A. Liquidus C. solvus

B. Solidus D. none of the above

C

77

The reaction that yields two solid phases on cooling a single solid phase is called

A. Eutectoid C. eutectic

B. Peritectoid D. congruent

A

78

If one solid phase splits into two solid phases on heating , the reaction is

A. Eutectic C. eutectoid

B. Peritectic D. peritectoid

D

79

The reaction that, on heating one solid phase , yields another solid phase plus one liquid phase is called

A. Eutectic C. eutectoid

B. Peritectic D. peritectoid

B

80

A Tie-line is used for finding

A. The solubility limit of the solute component of the alloy

B. Melting point of the alloy

C. Composition of the alloy in the two phases in equilibrium

D. Prpportion of the two phases in the alloy

C

81

Gibb’s phase rule is given by the equation

A. F=C+n-p C. F=C+2n-p

B. F=C+n+p D. F=C+2n-2p

A

82

Carbon in an iron is an example of

A. Intermetallic compound C. substitutional solution

B. Interstitial solid solution D. none of the above

B

83

In a solid solutions the two metals are completely soluble in the liquid state and

A. Partially soluble in the solid state

B. Completely soluble in the solid state

C. Completely insoluble in the solid state

B

84

In a eutectic transformation

A. Liquid 1 + liquid 2 → solid

B. Liquid 1 + liquid 2 → solid 1 + solid 2

C. Liquid 1 + liquid 2 → liquid + solid

D. None of the above

B

85

In a peritectic transformation

A. Liquid 1 + liquid 2 → solid 1 + solid 2

B. Liquid 1 + liquid 2 → solid 1 + liquid

C. Liquid + solid → solid 1 + solid 2

D. None of the above

C

86

Lever’s rule is used for calculating

A. The percentage of solid phase present in an alloy

B. The percentage of liquid and solid present in an alloy

C. The percentage of liquids present in an alloy

D. None of the alloy

B

87

Eutectic temperature of a eutectic system

A. Indicate the solidification temperature of pure metals

B. Indicates the solidification temperature of a solid solution

C. Indicates the lowest tepmperature at which a metal will solidify

D. None of the above

B

88

According to Home Rothery’s rule

A. The greater the solubility of two metals, the more restricted is their solubility

B. A metal of high valency can dissolve only a small amount of high valency metal

C. If the ration of the solute and solvent atoms lies between 15 %, then they form solid solution easily

D. All of the above

D

89

Peritectic reactions are related to

A. Congruent melting

B. Incongruent melting

C. None of the above

Check for option D

90

Zone refining will be more efficient if the ratio of impurity in the solid to that in the liquid is

A. 0.01 B. 0.1 C. 0.4 D. 1.0

A

91

In the phase diagram, the curve above which the ally is in the liquid state for all comopositions is called the_________.

Liquidus

92

At the eutectic point in a binary alloy, the number of degree of freedom is ___________.

Zero

93

The eutectic temperature of Pb-Sn binary alloy is ______.

1830C

94

During the pearlitic transformations

A. New phase form

B. Crystal structure chane

C. Composition of phase change

D. There is no diffusion

A, B & C

95

The fraction of pearlite in a 0.55% C steel is

A. 0.55 B. 0.31 C. 0.69 D. 0

C

96

If alpha of 82 % B and liquid of 57 % B are in euillibrium in an alloy of 73 % B, is 0.7, the overall composition is

A. 0.3 B. 74.5 % B C. 64.5 % B D, 25 % B

C

97

The eutectic mixture in a Pb-Sn solder alloy should be 90%. At the eutectic temperature, alpha of 19% Sn, liquid of 62% Sn and beta of 97 % Sn are in euillibrium. The possible compositiona of the solder alloy are

A. 57.7 % Sn B. 61% Sn C. 65.5% Sn D. 66.3% Sn

A

98

When nickel is added to copper, at a temperature of about 10000C

A. The alloy is in the liquid state

B. The alloy has a solubility limit of 40 wt % Ni

C. The alloy is in the FCC solid-solution state upto 50 wt % Ni

D. The alloy is in the FCC solid-solution state for all compositions upto 100 wt % Ni

D

99

In copper-nickel alloy

A. A eutectic point exists for 65 wt % Ni at 12200C

B. There is no eutectic point

C. The solubility limit at 10000C is 60 wt % Ni

D. The alloy is in the solid state below 13000C for all compositions

B

100

Iron carbon alloy is ferromagnetic at room temperature

A. For all compositions

B. For compositions above 0.022 wt % of carbon

C. For compositions below 0.022 wt % of carbon

D. For compositions above 6.7% wt % of carbon

C

101

In steel, pearlite phase is made up of alternate layers of

A. Ferrite and martensite

B. Ferrite and cementite

C. Martensite and cementite

D. Cementite and bainite

E. None of the above

B

102

What is the product of Cupola called?

A. Wrought iron C. mild steel

B. Cast iron D. pig iron

D

103

The melting point is lowest for

A. Low carbon steel

B. High carbon steel

C. Cast iron

D. Wrought iron

C

104

Pearlite is a combination of

A. Ferrite and iron graphite

B. Ferrite and cementite

C. Ferrite and austenite

D. Cementite and gamma iron

B

105

Which allotropic form of iron is magnetic at room temperature?

A. α iron B. β iron C. γ iron D. δ iron

A

106

The allotropic form of iron not having BCC lattice is

A. α iron B. β iron C. γ iron D. δ iron

C

107

A material having different properties in different directions is known as

A. amorphous C. anisotropic

B. copolymer D. austenite

C

108

Pearlite is combination of

A. 6.6 % carbon and 93.33 % iron

B. 13 % carbon and 87% cementite

C. 13 % cementite and 87 % ferrite

D. 13 % carbon and 87 % ferrite

C

109

Cementite is a combination of

A. 6.6 % carbon and 93.33 % iron

B. 13 % carbon and 87% cementite

C. 13 % cementite and 87 % ferrite

D. 13 % carbon and 87 % ferrite

A

110

The limit of carbon solubility in austenite on iron-equillibrium diagram is represented by

A. Line A1 C. line A3

B. Line A 2 D. none of the above

B

111

the beginning of transition from austenite to ferrite on iron-carbon equilibrium diagram is represented by

A. line a1 b. line Acm C. line A3 D. none of the above

C

112

The completion of austenite transition to ferrite and pearlite on iron-carbon equilibrium diagram is represented by

A. line a1 b. line Acm C. line A3 D. none of the above

A

113

When a pure iron is cooled from it’s melting temperature of 15380C, it has magnetic properties between the temperature of

A. 14000C and 9120C C. 7700C and room temperature

B. 9120C and 7700C D. 14000C and 7700C

D

114

The hardness of steel primarily depends on

A. Method of manufacture

B. Heat treatement employed

C. Shape of carbides and their distribution in iron

D. Percentage of carbon

C

115

Iron-carbon alloy of composition of carbon between 0.022 wt % and 6.70 wt % at temperature below 7270C exists in the two phase form__________

α+Fe3C

116

Iron-carbon alloy of composition between 0.008 wt % and 2.14 wt % of carbon above 10000C exist in __________ structure and are classified as

FCC & austenite

117

Austenite is a solid solution of carbon in _________ iron

A. Alpha B. beta C.gamma D. delta

C

118

As percentage of carbon increases in steel. Its _____ decreases.

A. Corrosion resistance C. hardness

B. Ultimate strength D. ductility

D

119

Which of the following will have least percentage of carbon?

A)High ductility wires;

B)Connecting rods;

C)Dies and punches;

D)Paper knives.;

A

120

Boiler plates are generally made of,

A)Dead mild steel; B) Mild steel; C) Medium carbon steel;

D) High Carbon Steel;

B

121

Which one of the following is non-ferrous metal ?

A) Iron; B) Zinc; C) Steel; D) Wood

B

122

Which has the lowest Melting Point?

A) Magenesium; B)Silver C) Nickel D) Brass D) Aluminium Bronze.

A

123

Above The curie temperature,a magnetic material becomes,

A) Diamagnetic; B) Paramegnetic;C)Ferromegnetic;D) Dielectric;

E) Non of the above

B

124

The capacity of Material to undergo deformation without rupture is Known as, A) Mechanical strength; B) Stiffness; C) Toughness;

D) Ductility

D

125

Slow and progressive deformation of a material with time under constant stress is called,

A)Creep; B)Erosion; C)Resilience; D)None of the above

A

126

Wrought iron is,

A)High carbon iron;

B) Highly resistance to acid corrosion;

C) Malleable and ductile: hence used for chain links, hooks and couplings;

D) An alloy of iron, chromium and carbon

C

127

Ultimate tensile strength is least in case of,

A)Cast iron;

B) Wrought iron;

C)Mild Steel;

D)Low carbon steel; E)High carbon steel

A

128

Above the curie temperature, a magnetic material becomes,

A)Ferromagnetic; B)Paramagnetic; C)Diamagnetic; D)None of the above

B

129

Chisels are made of ,

A)Dead mild steel; B) Low carbon steel; C)Medium carbon steel; D) High carbon steel

D

130

Eutectoid steel is steel containing carbon,

A)less than 0.8%; B)equal to 0.8%; C)from 0.8 to 2.0%; D)zero percent

B

131

Hypo-eutectoid steel contains carbon,

A)less than 0.8%; B)equal to 0.8%; C)from 0.8 to 2.0%; D)zero percent

132

Mild steel is,

A)a low carbon steel (0.05-0.3%carbon); B)highly resistant to corrosion(as much as stainless steel); C)a high carbon steel(0.5 to 1.5% carbon); D)very poor in strength and ductility

A

133

Hyper-eutectoid steel is steel containing carbon,

A)less than 0.8%; B)equal to 0.8%; C)from 0.8 to 2.0%; D)zero percent

134

The upper critical temperature for steel,

A)is constant; B)depends upon the rate of heating; C)varies according to carbon content in steel; D)none of the above

C

135

In order to improve machinability of stainless steel

A)0.2% selenium is added; B)0.35% selenium is added; C) 0.5% selenium is added; D)A or B above; E)B or C above

D

136

The highest percentages of chromium that can be added to steel usually,

A)12; B)15; C)18; D)25; E)50

C

137

Carbon percentages in cutlery stainless steel is,

A)0.25 to 0.3; B)0.76 to 0.80; C)1; D)1.1 to 1.35; E)1.35 to 1.65

A

138

_______ is chemically represented as Fe3C,

A)Cementite; B)Martensite; C)Ferrite; D)Austenite

A

139

Motorcar crankshafts are mostly made of high _____ steel,

A)silicon; B)chrome; C)nickel; D)speed

B

140

Connecting rods are made of _______ steel,

A)high speed; B)Medium carbon; C)low carbon; D)high chrome

B

141

Ball bearing are normally made from ________ steel,

A) high speed; B) high carbon; C) chrome; D) silicon

C

142

During hardening soft spots can be avoided by,

A)Using more effective cooling medium;

B) Protecting against decarburization in heating;

C) Obtaining more homogeneous structure employing annealing or normalizing before hardening;

D)Any of the above

D

143

If the steel at room temperature is magnetic, the presence of which constituent can be ruled out?

A) Ferro-magnetic materials; B) Ferri-magnetic materials;

C) Diamagnetic materials; D) Paramagnetic materials

C

144

Cementite is a combination of,

A) 6.67% carbon and 93.33% iron; B) 13% carbon and 87% ferrite; C) 13% cementite and 87% ferrite; D) 87% cementite and 13% ferrite

A

145

The limit of carbon solubility in austenite on iron-carbon equilibrium diagram is represented by,

A) Line A1; B) Line Acm; C) Line A3; D) None of the above

B

146

If the structure of sample consist of pearlite, cementite and free carbon the sample may be,

A) Cast iron; B) Alloy steel; C) Dead mild steel; D) Eutectoid steel

A

147

Which of the following is usually made of high carbon steel?

A) Hammers; B)Angle iron; C)Solid drawn tubes; D)Shafts;E)Boiler plates

A

148

Steel used for bearing is,

A) Mild steel; B)Carbon steel; C)carbon-chrome steel; D)stainless steel

C

149

Vanadium is added to steel mainly to increase its ,

A)Fatigue resistance; B)Corrosion resistance; C)Hardenability; D)Toughness

A

150

Dead mild steel has carbon percentage of ,

A)1%; B)0.87 to 0.95%; C)0.5 to 0.65%;

D)0.1 to 0.15 %; E)0.007 to 0.005%

D

151

The beginning of trasition from austenite to ferrite on iron-carbon equilibrium diagram is respresnted by

A)Line A1 B) Line A cm C) Line A3 D) None of the above

C

152

The colpletion of austenite to ferrite and pearlite on iron carbon equilibrium diagram is respresnted by

A)Line A1 B) Line A cm C) Line A3 D) None of the above

A

153

Which of the folowing is a non-destructive test?

A)Charphy test B) Izod impact test C) Tensile test D) cupping test

E) X-ray test.

E

154

In brinell hardness testing the time of loading is

A)1 seconds B) 15 to 30seconds C) 5 seconds D) 15 Seconds

E) 1 minute

B

155

In brinell hardness testing the minimum thickness of the speciment should be.

A)Less then 5 times the depth impression

B)Less then 10 times the depth impression

C)Thickness of thye specimen ha sno relevance to the depth of impreesion

D)More then 10 times the depth impression

D

156

Pearlite is a combination of

A)6.6% carbon and 93.33% iron B)13% ferrite 87% cementite C)13% cementite and 87% ferrite D)13% carbon and 87% ferrite.

A

157

Which is the hardnest out of the following ?

A)Austenite B)pearlite C)Ferrite D) cementite .

D

158

Fine grains of austenite

A) Increases hardenability in steel B) Decreases hardenability in steel C) Has nop effect on hardenability in steel D) Any of the above

B

159

Approximate brinell hardness number for talc is

A) 1 B)2 C)5-10 D)20-30 E) 50-80

D

160

Vickers hardness number for diamond could be of the order of

A)15000 B)12000 C) 8000 D) 4000

C

161

Percentage of iron in pig iron is approximately

A)99.9% B)95% C)90 D)80% E) 78%

C

162

Which of the following is easiest to bend ?

A) cast-iron B) grey pig iron C)Mottled pig irion D)Wrought iron

D

163

Corrsion rersistance of steel is increased by the addition of,

A) Phosphorous and tungsten B) nickel and chromium C) Lead and vanadium D) Molybdenum and tungsten.

B

164

In brinell hardness tester the load for aluminium is,

A) 3000kg B)1500kg C)1000kg D)500kg E)100kg

D

165

Free cutting steels usually have sulphur content of

A)0.002 percent B) 0.02 percent C)0.21 percent D)2 percent E)10 Percent

C

166

Which of the following is the hardest ?

A)Talc B) Fluorite C)Quartz D) Topaz E) Corundum

C

167

Percentege of carbon in mild steels ?

A) 0.010 to 0.025 B)0.10 to 0.25 C)0.8 to 0.85 D)Gears E)Spades

A

168

Which of the following isn usually made up of dead mild steel ?

A)Flanges B) shafts C) Fish plates D) gears E) spades.

A

169

The recrystallization temperature depends upon

A) grain size B)Type of metals C)Annealing time purity of meatls E)all of above F)None of the above

E

170

Austenitic stainless steels contain chromium and nickel in amounts required to assure that aven at room temperature, the retain their crystalline,which are,

A) Face centred cubic B)Diamond cubic

C) Hexagonal closed-pack D) Partly Amorphous.

A

171

The meting poing of mild steel is approximately,

A) 6000C B) 8000C C)10000C D)15000C

D

172

Railway rails are made of,

A) Medium carbon steel B) High carbon steel C) Ded mild steel

D) Mild steel

B

173

The stainless steel owe their resistance to corrosion to the presence of A)chromium B) Carbon C) Manganese D)sulphur

A

174

On heating a low carbon steel upto lower critical temperature ,the grain size,

A)Is minimum B)Increases very rapidly C)Remains same D)First decreasesand then increases very rapidly.

C

175

Low carbon steel contain carbon form,

A)0.05 to 0.10% B)0.10 to 0.20% C) 0.3 to 0.85% D) 0.85 to1.30%

B

176

Which allotropic form of iron is magnetic at room temperature?

A)α-iron B)β-iron C)γ-iron D)δ-iron

A

177

Which allotropic form of iron not having BCC lattice is

A)α-iron B)β-iron C)γ-iron D)δ-iron

C

178

The carbon content in steel is,

A)Above2% B) upto2% C) below 0.8 % D)above 6.3%

B

179

The carbon content in cast iron is ,

A) Above2% B)upto2% C) below 0.8 % D)above 6.3%

A

180

When a pure iron is cooled from its melting temperature to 15390C, it has magnetic properties between the temperatures of,

A)14000Cand 9100C B)9100C and7680C C) 7680C and room temperature. D) 14000C and 7680C

C

181

Which of the following is expected to have highest percentage of carbon?

A) structural steel Rod B) Weldable boiler tubes C) Railway axels

D) Dies for wire drawing.

D

182

Gamma iron exists

A)Between 9000C&14040C B) Between14040C&15350C C) Below 7680C D) Between 7680C and 9000C

A

183

Delta iron exists,

A)Between 9000C&14040C B) Between14040C&15350C C) Below 7680C D) Between 7680C and 9000C

B

184

Which of the following factors govern the grain size?

A) Nature and extent of deoxidizers

B) Chemical composition of steel

C) Alloying elements

D) Heat-treatment processes

E) All of the above

E) None of the above

E

185

For which tool steel will have highest percentage of carbon?

A)Twist drills B) Turning tools C) Ordinary file D) Saw for steel cutting

A

186

A hardness value of 1400BHN can be expected in case of,

A)Cementite B) Ferrite C) Pearlite D) All of the above E) None of the above

A

187

Iron carbon equilibrium diagram

A) Is constructed by plotting temperature along y-axis and carbon percentage along x-axis

B) Establishes a correlation between the microstructure and properties of steel and cast iron C)Indicates the phase changes that occur during heating and cooling D) All of the above

E) None of the above

D

188

The hardness of steel primarily depends on,

A) Method of manufacture B) Heat treatment employed C) Shape of carbides and their distribution in iron D) Percentage of carbon

C

189

Alpha iron exists,

A)Between 9000C&14040C B) Between14040C&15350C C) Below 7680C D) Between 7680C and 9000C

C

190

Beta iron exists,

A)Between 9000C&14040C B) Between14040C&15350C C)Below 7680C D) Between 7680C and 9000C

D

191

Chisels are usually made of ………steel

A)Low carbon B) Mild C) High carbon D) None of the above

C

192

When a pure iron is cooled from its melting temperature of 15390C,it has non-magnetic properties between the temperature of,

A) 14000C and 9100C B) 9100C and 7680C

C) 7680C and room temperature D) 14000C and 7680C

D

193

The wrought iron is having,

A)Tensile strength minimum and ductility maximum in the longitudinal direction.

B) Tensile strength maximum and ductility minimum in the longitudinal direction.

C)Tensile strength and ductility maximum minimum in the longitudinal direction.

D)Tensile strength and ductility maximum and ductility minimum in the longitudinal direction.

C

194

The process which occurs with heating in excess of that used for recovery is called,

A)Grain groth B)Recrystallization C) Cold working D) Hot working

B

195

Iron which contains little or no carbon is called……………

ferrite

196

Cementite contains carbon to the tune of……………

6.67%

197

………………….Is the name given to a mixture of about 87.5% feeite and 12.5%Cementite

pearlite

198

Pearlite is eutectoid of………….

steel

199

…………….Steels are mixtures of pearlite and and cementite.

hard

200

Austenitic steels are……….

Non magnetic

201

…………..stees contain upto 0.8percent carbon.

hypoeutectoid

202

The ferrite and cementite comine in layers and the resultant structure is termed…………..

Pearlite

203

The hardening capacity of steel ……….with increase in carbon content.

Increases

204

…………………Power refers to the maximum hardness obtainable with steel of given composition.

Hardening

205

…………….are primarily alloys of copper and zinc.

Brass

206

……………..metals is a white bearing alloy.

Babbit

207

……………..bearings are applicable to non-accessible ,slow-running machinery both marine and stationary.

Graphite

208

………………Bearings are produced by powder metallurgy.

`pourous

209

The melting point of duralumin is………………

6500C

210

…………….is extensively used for such components as piston cylinder heads and crankcases of internal combustion engines.

Y-alloy

211

Structure of thorium is ……………..

FCC

212

Steel having ferrite and pearlite are

B. Soft B. Hard C. Malleable D. Ductile

A

213

When P is the number of phases, f is degrees of freedom and c is number of components in the system, then according to phase rule

A.P+f=c-2 C. p+f=f-2

B.P+f=c+2 D. p+c=f+2

B

214

Steel with 100% pearlite is called

A.Eutectoid C. Hyper-eutectoid

BAustenite D. Solidus

A

215

High ductility steel wires are generally made of

A.Alloy steel C. high carbon steel

B.Mild steel D. Dead mild steel

D

216

Ferrite is

A.Amorphous and brittle

B.Soft and ductile

C.Hardneable under rapid cooling

D.Present in abundance in high carbon steels

B

217

The degree of freedom, when FCC iron and BCC iron co-exist in equilibrium are

A.2 B. 1 C. 0 D. -1

B

218

The reaction that, on heating one solid phase , yields another solid phase plus one liquid phase is called

A.Eutectic C. eutectoid

B.Peritectic D. peritectoid

B

219

In a peritectic transformation

A.Liquid 1 + liquid 2 → solid 1 + solid 2

B.Liquid 1 + liquid 2 → solid 1 + liquid

C.Liquid + solid → solid 1 + solid 2

D.None of the above

C

220

Lever’s rule is used for calculating

A.The percentage of solid phase present in an alloy

B.The percentage of liquid and solid present in an alloy

C.The percentage of liquids present in an alloy

D.None of the alloy

B

221

The fraction of pearlite in a 0.55% C steel is

A.0.55 B. 0.31 C. 0.69 D. 0

C

222

In steel, pearlite phase is made up of alternate layers of

A.Ferrite and martensite

B.Ferrite and cementite

C.Martensite and cementite

D.Cementite and bainite

E.None of the above

B

223

The limit of carbon solubility in austenite on iron-equillibrium diagram is represented by

A.Line A1 C. line A3

B.Line A2 D. none of the above

D

224

The beginning of transition from austenite to ferrite on iron-carbon equilibrium diagram is represented by

A.line a1 b. line Acm C. line A3 D. none of the above

C

225

When a pure iron is cooled from it’s melting temperature of 15380C, it has magnetic properties between the temperature of

A.14000C and 9120C C. 7700C and room temperature

B.9120C and 7700C D. 14000C and 7700C

D

226

As percentage of carbon increases in steel. Its _____ decreases.

A.Corrosion resistance C. hardness

B.Ultimate strength D. ductility

D

227

Chisels are made of ,

A)Dead mild steel; B) Low carbon steel; C)Medium carbon steel; D) High carbon steel

D

228

The upper critical temperature for steel,

A)is constant; B)depends upon the rate of heating;

C) varies according to carbon content in steel; D)none of the above

C

229

Dead mild steel has carbon percentage of ,

A)1%; B)0.87 to 0.95%; C)0.5 to 0.65%;

D)0.1 to 0.15 %;

D

230

In brinell hardness tester the load for aluminium is,

A) 3000kg B)1500kg C)1000kg D)500kg E)100kg

D

231

Free cutting steels usually have sulphur content of

A)0.002 percent B) 0.02 percent C)0.3 percent D)2 percent E)10 Percent

C

232

Low carbon steel contain carbon form,

A)0.05 to 0.10% B)0.10 to 0.20% C) 0.3 to 0.85% D) 0.85 to1.30%

B

233

Which of the following is expected to have highest percentage of carbon?

B) structural steel Rod B) Weldable boiler tubes C) Railway axels

D) Dies for wire drawing.

D

234

Given microstructure is of

A. High carbon steel

B. low carbon steel

C. dead steel

D. medium carbon steel

B

235

Combined carbon in iron makes the metal

A. Soft and gives coarse grained crystalline structure

B. Soft and gives a fine grained crystalline structure

C. Hard and gives a coarse grained crystalline structure

D.Hard and gives a fine grained crystalline structure

D

236

Which one of the following sets of constituents is expected in equllibrium cooling of a hyper-eutectoid steel from austenitic state?

A.Ferrite and pearlite C. cementite and pearlite

B.Ferrite and bainite D. cementite and martensite

C

237

The portion of the phase diagram indicates

A. Peritectoid reaction C. eutectoid reaction

B. Peritectic reaction D. eutectic reaction

B

238

For alloys between 0.18 and 0.50 percent c , the allotropic change begins and end at a

A. Constant Temp. C. Constant Composition

B. Constant Pressure D. All of the above

A

239

The ……. Mixture is not usually seen in the microstructure , since austenite is not stable at room temp. and must undergo another reaction during cooling .

A Eutectoid C. Eutectic

B Peritectoid D.Peritectic

C

240

Crystal structure of iron carbide is …..

A HCP C.BCC

B Diamond Cubic D. Onthortombic

D

241

…….. is the lowest temp. at which F.C.C. iron can exist under equillibriam condition

A Acm line C.A4 line

B A1 line D.A0 line

B

242

Since….. are stable structure , the microstructure remains substantially the same down to the room temp.

A Ferrite and Letebunite C. Austenite and Ferite

B Pearlite and Cementite D.Ferrite And Pearlite

D

243

Ferrite is relatively soft with ….strength , cementite is hard with very ……. Strength .

A Low tensile , high compressive C. Low compressive , high tensile

B Low tensile , low tensile D. High tensile , high Compressive

B

244

For hypoeutectoid steel ……… ….. will increase up to the eutectoid composition of 0.80 percent carbon .

A Impact strength and Brinell hardness

B. Tensile strength and Brinell hardness test

C Tensile strength and ductility

D Impact strength and ductility

B

245

In large quantity …………..reduces ductility , thereby increasing the tendency of the steel to crack when cold worked , making it cold short .

A Silicon C. Manganese

B Sulphur D. phosphorus

D

246

………. promotes the soundness of steel casting through its deoxidizing action on liquid steel

A Manganese C. Phosphorus

B Silicon D. Sulphur

C

247

Without greatly decreasing the ductility , to improve the strength of the steel ………….. is added to plain carbon steel .

A Sulphur C. Mangances

B silicon D. phosphorus

B

248

…. ……………..Steel will have reduced pipe with increasing yield .

A Semi-killed C. Killed

B Rimmed D. Capped

B

249

……… show more pipe because of absence of blow holes

A Rimmed C.killed

B Semi-killed D.Capped

C

250

…………………… is used when the final product is to be made to exacting specification , when subsequent mechanical working is limited and when uniform properties throughout the structure are required

A Rimmed C. killed

B Semi-killed D. Capped

C

251

Because of less depth of hardening ………….. are of shallow hardening type . A Dead-mild steel C. Medium carbon steel

B Mild steel D. Low carbon steel

C

252

High Carbon steel are best suited for ……..

A Music wire C. Small Forging

B Hammers D. Crank Shafts

A

253

Low Carbon steel are best suited for ……..

A Turbine rotors C. Fan blades

B shear blades D. Music Wire

C

254

For hypoeuteoid steel unless the distbutions of phase is known correctly prediction of … …………….can not be done accurately

A Hardness and Ductility C. Tensile strength and ductility

B Impact strength and ductility D. All of the Above

B

255

For hypereutectoid steels morphology strongly affects to the mechanical properties except……………….

A Tensile strength C. malleability

B Ductility D.Hardness

D

256

For good corrosion resistance ….. steel is best suited .

A Medium carbon low alloy C. Low carbon high alloy

B High carbon low alloy D. High carbon high alloy .

C

257

Deep Hardening steel are……

A LCS B.HCS C MCS D. Dead Mild Steel

B

258

Tensile strength of 0.4% C steel is

A 66 Kg/mm2 C. 56 Kg/mm2

B 46 Kg/mm2 D. 36 kg/mm2

C

259

Hardness of 0.4%C steel is

A 145 BHN C. 155 BHN

B 135 BHN D.165 BHN

C

260

Medium carbon steel are also called as ………..

A Machinery Steel C. Tool steel

B Structural Steel D. Mild Steel

A

261

Under non-equillibrium cooling widmanstatten structures are observed in steel………….

A Less than 0.6% C and more than 1% C

B Less than 1% C and more than 0.6% C

C More than 0.6% C and more than 1% C

D More than 1% C and less than 0.6% C D.

A

262

The detorioration in properties of hypoeuteoid steel due to widmanstatten structure can be reduced by addition of ……………

A Sulphur B. Phosphorus C Manganese D. Silicon

D

263

Given microstructure is of

A. 1.2% C Steel C.0.6% C steel

B widmanstatten D. Cored

B

264

Free carbon in iron makes the metal

A. Soft and gives a coarse grained crystalline structure

B. Soft and gives a fine grained crystalline structure

C. Hard and gives a coarse grained crystalline structure

D. Hard and gives a fine grained crystalline structure

A

265

For the allotropic forms of iron, the points of arrest are

A. The points where no further change occurs

B. Constant for all metals

C. The points where there is no further flow of metals

D. The points of discontinuity

D

266

Killed steels are those steels

A. Which are destroyed by burning

B. Which after there destruction are recycled to new material

C. Which are deoxidized in the ladle with silicon and aluminium

D. In which carbon is completely burned

C

267

Hardness of steel depends on

A. Amount of carbon it contains

B. The shape and dictribution of the carbides in iron

C. Method of fabrication

D. Contents of alloying elements

B

268

Tensile strength of the steel can be safely increased by

A. Adding carbon upto 2.8% C. Adding carbon upto 6.67%

B. Adding carbon upto 0.8% D. Adding small quantities of copper

B

269

Hardenability of steel

A. Is the depth of penetration obtained by vicker’s test

B. Is the ability of steel to resist abrasion, wear and penetration

C. Is the property which determines the depth of hardened zone induced by quenching

D. Is it’s ability to withstand shocks

C

270

Which of the following is most ductile material

A. Mild steel C. Copper

B. Zinc D. Aluminium

A

271

The relation between tensile strength and hardness for steel can be expressed by the curve

A. A B. B C. C D. D

A

272

The alloying elements that could make steel austenitic at room temperature are

A. Chromium & titanium C. Carbon & sulphur

B. Nickel & manganese D. Molybdenum & titanium

B

273

Silicon is added in low carbon steels to

A. Make the steel tougher and harder

B. raise the yield point

C. make the steel ductile and of good bending qualities

D. all of these

A

274

In low carbon steels, presence of small quantities of sulphur improves

A. Weldability C.Formability

B. Machinability D. Hardenability

B

275

Killed steels

A. Have minimum impurity level C. Have maximum impurity

B. Are free from oxygen

DHave almost zero percentage of phosphrous and sulphur

EHave almost zero percentage of phosphrous and sulphur

B

276

The lower critical temperature

A. Decreases as the carbon content in steel increases

B. Increases as the carbon content in steel increases

C. Is same for all steels

D. Depends upon the rate of heating

C

277

When a steel containing less than 0.8% carbon is cooled slowly from temperature above or below the critical range, it consist of

A. Mainly ferrite C. Mainly pearlite

B. Ferrite and pearlite D. cementite and pearlite

C

278

1. Match the correct percentage of carbon given in Group B for the type of material given in Group

Group A(material)

Group B (carbon percentage)

(a)hypo-eutectoid steel

(A) 4.3-6.67

(b)hyper-eutectoid steel

(B) 2.0-4.3

(c)hypo-eutectic cast iron

(C) 0.8-2.0

(d)hyper-eutectic cast iron

(D) 0.008-0.8

D,C,B.A

279

Austenite to pearlite transformation is greatly affected by

A. Composition of transformation

B. Pressure of transfrormation

C. Temperature of transformation

D. All of the above

C

280

Pearlite becomes finer due to…….

A. Increase in heating rate C. Increase in nucleation rate

B. Increase in cooling rate D. Decrease in cooling rate

C

281

……………steels are used for components which have to be forged, carburized, or heat trated.

A. Rimmed C.Killed

B. Semi-killed D.Semi-rimmed

C

282

………….. is the only element which neither forms carbides nor causes graphitization.

A. Copper C. Cobalt

B. Chromium D. Carbon

C

283

Hypoeutectoid steels with widmanstatten structure are characterized by

A. High ductility & toughness

B. Low toughness & hardness

C. High toughness & hardness

D. Low toughness & ductility

D

284

Iron carbon alloy is ferromagnetic at room temperature

A. For all compositions

B. For compositions above 0.025 wt % C

C. For compositions below 0.025 wt % C

D. For compositions above 6.7% wt % C

C

285

Fine grains of austenite

A. Increases hardenability in steel

B. Decreases hardenability in steel

C. Has no effect on hardenability in steel

D. Any of the above

B

286

…………..line involves the allotropic change

A. A3 line C. Acm line

B. Both D. A0

A

287

-------------line involves only change in chemical composition

A. A3 line C. A4 line

B. Acm lin D. A0 line

B

288

Given sketch shows ingot of

A. Rimmed steel C.Killed steel

B. Semi-killed steel D. Capped steel

B

289

Tool shown in the given sketch is made up of

A. 0.6% C

B. 1.2% C

C. 0.2%C

D. 0.8%C

D

290

Tools shown in the given sketch are made up of

A. 0.8% C C. 0.4% C

B. 1.4% C D.1.8% C

B

291

The given microstructure is of

A. 0.2% c

B. 0.6% c

C. 0.8%c

D. 1.6%c

C

292

Which of the following property is desirable for materials used in tools and machines?

(a) Elasticity (b) Plasticity (c) Ductility (d) Malleability

a

293

The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is

(a) Elasticity (b) plasticity (c) ductility (d) malleability

b

294

Which of the following material has maximum malleability?

(a) Lead (b) soft steel (c) wrought iron (d) copper

a

295

The carbon in the pig iron varies from

(a) 0.1 to 0.5% (b) 0.5 to 1% (c) 1 to 5% (d) 5 to 10%

c

296

Free carbon in iron makes the metal

E. Soft and gives a coarse grained crystalline structure

F. Soft and gives a fine grained crystalline structure

G. Hard and gives a coarse grained crystalline structure

H. Hard and gives a fine grained crystalline structure

a

297

Combined carbon in iron makes the metal

D. Soft and gives coarse grained crystalline structure

E. Soft and gives a fine grained crystalline structure

F. Hard and gives a coarse grained crystalline structure

(d)Hard and gives a fine grained crystalline structure

d

298

The percentage of carbon in cast iron varies from

(a) 0.1 to 0.5 (b) 0.5 to 1 (c) 1 to 1.7 (d) 1.7 to 4.5

d

299

Wrought iron

(a) Is a ductile material

(b) Can be easily forged or welded

(c) Cannot stand sudden and excessive shocks

(d) All of these

d

300

Steel containing upto 0.15% carbon, is known as

(a) Mild steel (c) dead mild steel

(b) Medium carbon steel (d) high carbon steel

c

301

Steel containing 0.8 to 1.5% carbon, is known as

(a) Mild steel (c) dead mild steel

(b) Medium carbon steel (d) high carbon steel

d

302

According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is

(a) 0.04% (b) 0.35 to 0.45% (d) 0.4 to 0.6%

(c) 0.6 to 0.8%

b

303

Silicon is added in low carbon steels to

(a) Make the steel tougher and harder

(b)raise the yield point

(c) make the steel ductile and of good bending qualities

(d) all of these

a

304

Which of the following is added in low carbon steels to prevent them from becoming porous?

(a) Sulphur (b) phosphorus (c) manganese (d) silicon

d

305

In low carbon steel,.......raises the yield point and improves the resistance to atmospheric corrosion.

(a)sulphur (b) phosphors (c) manganese (d) silicon

B

306

Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

(a) Sulphur (b) phosphrous (c)Manganese (d) silicon

c

307

In low carbon steels, presence of small quantities of sulphur improves

(a) Weldability (b) formability (c) machinability (d) hardenability

c

308

A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to

(a) 100N/mm2 (b) 200N/mm2 (c) 350N/mm2 (d) 1000N/mm2

c

309

A steel alloy containing 36% nickel is called

(a) Stainless steel (c) invar

(b) High speed steel (d) heat resisting steel

c

310

The material widely used for making pendulums of clocks is

(a) Stainless steel (c) high resisting steel

(b) High speed steel (d) nickel steel

d

311

In high speed steels, manganese is used to tougher the metal and to increase its

(a) Yield point (c) critical temperature

(b) Melting point (d) hardness

c

312

The steel widely used for making precision measuring instruments is

(a) Nickel steel (c) nickel-chrome steel

(b)high speed steel (d) chrome-vanadium steel

a

313

A small percentage of boron is added to steel in order to

(a) increase hardenability (c) reduce machinabilty

(b) increase wear resistance (d) increase endurance strength

a

314

Which of the following material has nearly zero coefficient of expansion?

(a) Stainless steel (c) invar

(b) High speed steel (d) high resisting steel

c

315

Chromium when added to steel........the tensile strength

(a) Does not effect (b) decrease (c) raises

c

316

Vanadium when added to steel and chromium

(a)increase tensile strength (b) decrease tensile strength

(c) raises critical temperature (d) lowers critical temprature

a

317

Tungsten when added to steel.......the critical temperature

(a) Does not effect (b) lowers (c) raises

c

318

The machinabilty of steel is improved by adding

(a) Nickel (b) chromium (c) nickel and chromium (d) sulphur, lead and phosphrous

d

319

The presence of hydrogen in steel causes

(a) Reduced neutron absorption cross-section

(b) Improved weldability (d) embrittlement

(c) Corrosion resistance

d

320

Corrosion resistance of steel is increased by adding nickel and chromium

(a) Agree (b) disagree

a

321

Hardness of steel is increased by adding sulphur, lead and phosphrous.

(a) Yes (b) no

b

322

Shock resistance of steel is increased by adding

(a) Nickel (c) nickel and chromium

(b) Chromium (d) sulphur, lead and phosphrous

c

323

The steel widely used for motor car crankshaft is

(a) Nickel steel (c) nickel-chrome steel

(b) Silicon steel (d) chrome steel

d

324

The silicon steel is widely used for

(a) Connecting rod (c) cutting rod

(b)generators and transformers in the form of laminated cores

(d) motor car crankshaft

b

325

The cutting tools are made from

(a) Nickel steel (c) chrome steel

(b) Nickel-chrome steel (d) high speed steel

d

326

Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

(a) Diamond, carbide, high speed steel

(b) Carbide, diamond, high speed steel

(c) High speed steel, diamond, carbide

(d)high speed steel, carbide, diamond

d

327

Killed steels

(a) Have minimum impurity level

(b) Are produced by L-D process

(c) Are free from oxygen

(d) Have almost zero percentage of phosphrous and sulphur

c

328

An alloy steel which is work hardeable aand which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

(a) Chromium (b) silicon (c) manganese (d) magnesium

c

329

Connecting rod is, usually, made from

(a) Low carbon steel (c) medium carbon steel

(b) High carbon steel (d) high speed steel

c

330

The alloying element which can replace tungsten in high speed steels is

(a) Nickel (b) vanadium (c) cobalt (d) molybdenum

d

331

Free cutting steels

(a) Contain carbon in free form

(b) Require minimum cutting force

(c)is used where rapid machining is the price requirement

(d) can be cut freely

c

332

Ball bearings are usually, made from

(a) Low carbon steel (c) chrome steel

(b) High carbon steel (d) medium carbon steel

c

333

Shock resisting steels should have

(a) Low wear resistance (c) low hardness

(b) Low tensile strength (d) toughness

d

334

The alloy, mainly used for corrosion resistance in stainless steel is

(a) Chromium (c) silicon

(b) Manganese (d) carbon

a

335

The nuts and bolts are made from silicon steel

(a) Right (b) wrong

b

336

The alloying element which reduces the formation of iron sulphide in steel is

(a) Chromium (c) nickel

(b) Vanadium (d) manganese

d

337

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

(a) Chromium (c) cobalt

(b) Nickel (d) vanadium

c

338

The main alloying elements for high speed steel in order of increasing proportion are

(a) Vanadium, chromium, tungsten

(b)tungsten, titanium, vanadium

(c) chromium, titanium, vanadium

(d) tungsten, chromium,titanium

a

339

The blade of a power saw is made of

(a) Boron steel (c) high speed steel

(b) Stainless steel (d) malleable cast iron

c

340

In high speed steel, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance

(a) True (b) false

a

341

The high speed steel has........percentage of tungsten.

(a) Maximum (b) minimum

a

342

A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel

(a) True (b) false

a

343

A steel containing 16 to 18% nickel and about 0.12% carbon is called

(a) Ferritic stainless steel

(b)austenitic stainless steel

(c) martensitic stainless steel

(d) nickel steel

a

344

The austenitic stainless steel contains

(a) 18% chromium and 8% nickel

(b) 8% chromium and 18% nickel

(c) 14% chromium and 0.35% carbon

(d) 145 nickel and 0.35% carbon

a

345

The type of steel is given in group A. Match the correct product given in Group B.

Group A (type of steel)

Group B (product)

(a) Mild steel

(A) Screw driver

(b) Tool steel

(B) Commercial beams

(c) Medium carbon steel

(C) Crane hooks

(d) High carbon steel

(D) Blanking dies

(B),(D),(A),(C)

346

18/8 stainless steel consist of

(a) 18%nickel and 8% chromium

(b) 18% chromium and 8% nickel

(c) 18% nickel and 18% chromium

(d) 8% nickel and 8% chromium

b

347

Dye penetrant method is generally used to locate

(a) Core defect (c) surface defect

(b) Superficial defect (d) temporary defect

c

348

Macro-structure of a material is, generally, examined by

(a) Naked eye (c) optical microscope

(b) X-ray techniques (d) none of these

d

349

Crystal structure of material is, generally, examined by

(a) Naked eye (c) optical microscope

(b) Metallurgical microscope (d) X-ray techniques

d

350

When a low carbon steel is heated upto upper critical temperature

(a) There is no change in grain size

(b) The average grain size is a minimum

(c) The grain size increases very rapidly

(d) The grain size first increases and then decreases very rapidly

b

351

When a medium carbon steel is heated to coarsening temperature,

(a) There is no change in grain size

(b) The average grain size is a minimum

(c) The grain size increase very rapidly

(d) The grain size first increases and then decreases very rapidly

c

352

When low carbon steel is heated upto lower critical temperature

(a) There is no change in grain size

(b) The average grain size is a minimum

(c)The grain size increase very rapidly

(d)The grain size first increases and then decreases very rapidly

a

353

The quenching of steel from upper critical point results in a fine grained structure.

(a) Agree (b) disagree

a

354

The slow cooling of steel from the........result in a coarse grained structure.

(a) Lower critical point (b) upper critical point

355

A material is saind to be allotropic, if it has

(a) Fixed structure at all temperature

(b) Atoms distributed in random pattern

(c)Different crystal structure at different temperatures

(d) any one of the above

c

356

A fine grained steel

(a) A less tough and has a greater tendency to distort during heat treatement

(b) Is more ductile and has less tendency to distort during heat treatement

(c) Is less tough and has a less tendency to distort during heat treatement

(d) Is more ductile and has a greater tendency to distort during heat treatement

b

357

A coarse grain steel

(a) A less tough and has a greater tendency to distort during heat treatement

(b)Is more ductile and has less tendency to distort during heat treatement

(c) Is less tough and has a less tendency to distort during heat treatement

(d)Is more ductile and has a greater tendency to distort during heat treatement

a

358

Which of the following iron exists at 910°c?

(a) α-iron (b) β-iron (c) γ-iron (d) δ-iron

a

359

Which of the following iron exit in between 910°c and 1403°c?

(a) α-iron (b) β-iron (c) γ-iron (d) δ-iron

c

360

The delta-iron is posses a body centred cubic space lattice.

(a) Correct (b) incorrect

361

Pearlite is combination of 87% of ferrite and 13% cementite.

(a) Yes (b) no

a

362

The hardness of the steel depends upon the

(a) Amount of cementite is contain

(b) Amount of carbon is contained

(c) Contents of allying elements

(d) Method of manufacture of steel

a

363

The hardness of the steel increases if it contains

(a) Pearlite (b) ferrite (c) cementite (d) martensite

c

364

A steel with 0.8% of carbon is known as

(a) Eutectoid steel (c) hyper-eutectoid steel

(b) Hypo-eutectoid steel (d) none of these

a

365

Eutectoid reaction occurs at

(a) 600°c (b) 723°c (c) 1147°c (d) 1493°c

b

366

A steel with carbon......is known as hypo-eutectoid steel.

(a) 0.85 % (b) below 0.8% (c) above 0.8%

367

A steel with carbon above 0.8% is known as hyper-eutectoid steel.

(a) Agree (b) disagree

a

368

The lower critical temperature

(a) Decreases as the carbon content in steel increases

(b) Increases as the carbon content in steel increases

(c) Is same for all steels

(d) Depends upon the rate of heating

c

369

Gamma-iron occurs between the temperature range of

(a) 400°c to 600°c (c) 900°c to 1400°c

(b) 600°c to 900°c (d) 1400°c to 1530°c

c

370

Delta-iron occurs between the temperature range of

(a) 400°c to 600°c (c) 600°c to 900°c

(b) 900°c to 1400°c (d) 1400°c to 1530°c

d

371

The temperature point at which the change starts on heating the steel is called

(a) Lower critical point (c) upper critical point

(b) Point of recalscene (d) point of decalescence

a

372

The temperature point at which the change ends on heating the steel is called

(a) Lower critical point (c) upper critical temepature

(b) Point of recalscene (d) point of declaescene

b

373

The lower critical point for all steels is

(a) 600°c (b) 700°c (c) 723°c (d) 913°c

c

374

The upper critical point varies according to the carbon content in steel

(a) True (b) false

a

375

For a steel containing 0.8% carbon

(a) There is no critical point

(b) Upper ctritical point

(c) Point of recalscene

(d) point of declaescene

b

376

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

(a) eutectic cast iron (c) hypo-eutectic cast iron

(b) hyper-eutectic cast iron (d) none of these

c

377

Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast iron.

(a) Right (b) wrong

b

378

Iron-carbon alloys containing carbon........4.3% are known as hyper-eutectic cast iron.

(a) Equal to (b) less than (c) more than

c

379

A steel with 0.8% carbon and 100% pearlite is called

(a) Eutectoid steel (b) hypo-eutectic steel

(b)hyper-eutectoid steel (d) none of these

a

380

An eutectoid steel consist of

(a) Wholly pearlite (c) wholly austentite

(b) Pearlite and ferrite (d) pearlite and cementite

a

381

Pearlite consist of

(a) 13% carbon and 87% ferrite

(b) 13% cementite and 87% ferrite

(c) 13% ferrite and 87% cementite

(d) 6.67% carbon and 93.33% iron

b

382

Cemetite consist of

(a) 13% carbon and 87% ferrite

(b)13% cementite and 87% ferrite

(c) 13% ferrite and 87% cementite

(d) 6.67% carbon and 93.33% iron

d

383

Which one of the following sets of constituents is expected in equllibrium cooling of a hyper-eutectoid steel from austenitic state?

(a) Ferrite and pearlite (c) cementite and pearlite

(b) Ferrite and bainite (d) cementite and martensite

c

384

When a steel containing less than 0.8% carbon is cooled slowly from temperature above or below the critical range, it consist of

(a) Mainly ferrite (c) mainly pearlite

(b) Ferrite and pearlite (d) cementite and pearlite

b

385

When a steel containing......0.8% carbon is cooled slowly below the lower critical point, it consist of ferrite and pearlite

(a) Equal to (b) less than (c) more than

b

386

When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consist of

(a) Mainly ferrite (c) mainly pearlite

(b) Ferrite and pearlite (d) cementite and pearlite

d

387

The austenite is a solid solution of carbon or iron carbide in gamma-iron.

(a) Correct (b) incorrect

a

388

The maximum solubility of carbon in austenite is 1.7% at 1130°c.

(a) Yes (b) no

a

388

Which of the following statement is wrong?

(a) A steel with 0.8% carbon is wholly pearlite.

(b) The amount of cementite is increases with the increase in percentage of carbon

(c) A mechanical mixture of 87% cementite and 13% ferrite is called pearlite.

(d) The cementite is identified as round particles in the structure.

c

389

A steel containing ferrite and pearlite is

(a) Hard (b) soft (c) tough (d) hard and tough

b

390

Ferrite and pearlite makes the steel soft and ductile.

(a) Agree (b) disagree

a

391

An alloy steel which is work hardneable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron,carbon and

(a) Chromium (b) silicon (c) manganese (d) magnesium

c

392

Phosphrous is added in low carbon steels to raise its yield point.

(a) True (b) false

a

393

Manganese is added in low carbon steel to

(a) Make the steel tougher and hardner

(b) Raise the yield point

(c)make the steel ductile and of good bending qualities

(d) all of these

c

Prof D.H.Darekar

Department of Mechanical Engineering

SNJB COE Chandwad