MEASUREMENT IMPORTANT QUESTIONS FUTURE SECURE...

MEASUREMENT IMPORTANT QUESTIONS

FUTURE SECURE INSTITUTE™

05. (Electrical Instruments and

Measurements)

1. (Introduction to Electrical Measuring

Instruments)

(LMRC 2015)

1. Hot wire ammeters are used for measuring:

(a) Only a.c.

(b) Only d.c

(c) Neither a.c nor d.c

(d) Both a.c. and d.c.

(SSC JE 2008)

2. Which of the following meters is an

integrating type instrument?

(a) Ammeter

(b) Voltmeter

(c) Wattmeter

(d) Energy meter

(SSC JE 2007)

3. Which of the following instruments is an

integrating type instrument?

(a) Wattmeter

(b) Energy Meter

(c) Power Factor Meter

(d) None of the above

(MPJE 2015)

4. An electrodynamometer type of instruments

finds its major use as

(a) Standard instrument only

(b) Transfer instrument only

(c) Both as or standard and transfer

instruments

(d) An indicator type of instrument

(UPSSSC 2015)

5. Electrostatic instruments are used for

measuring

(a) AC and DC voltage

(b) Ac voltage and current

(c) Dc voltage and current

(d) AC and DC currents

(DMRC 2014)

7. Electrostatic instruments are suitable for the

measure of:

(a) ac and dc voltages

(b) ac voltage and current

(c) dc voltage and current

(d) ac and dc current

(UPSSSC JE-2016)

8. Rectifier type instrument can b e use in-

(a) a.c.

(b) d.c.

(c) Both (a) and (d)

(d) Pulsating

(UPSSSC JE-2016)

9. Dynamometer type of instrument can use in-

(a) a.c.

(b) d.c.

(c) (b)/(a)

(d) Pulsating

(UTTARAKAHND –I 2013)

10. Which one of the following instruments is equally

accurate on ac as well as dc circuits?

(a) PMMC voltmeter

(b) Dynamometer wattmeter

(c) Moving iron ammeter

(d) Induction wattmeter

2. (Measurement and Errors)

(SSCJE 2012)

1. Which one of the following types of

instruments does suffer from error due to

magnetic hysteresis?

(a) Induction type

(b) Electrodynamics

(c) Moving Iron

(d) PMMC

(JMRC 2012)

2. A generated voltage is equally dependent on

three resistance R1 , R2 , R3 and its value

V= (R1 R2)/ (R3). If tolerance of each

resistor is 0.1%, what will be the maximum

error in voltage?

(a) 0.30%

(b) 0.3%



(c) 0.10%

(d) 0.1%

(MPJE 2015)

3. Which one of the following statements

correctly response the systematic error?

(a) These error can be calculated from the

details of the instrument.

(b) These are the residual errors.

(c) These errors may occur controlled

conditions.

(d) These are the error committed by the

experiments.

(UPSSSC 2014)

4. Swamp resistance and condenser are used

(a) To reduce the error while measuring DC

quantities in a moving iron instrument

(b) To reduce the error while measuring AC

quantities in a moving iron instrument

(c) To reduce the error while measuring DC

quantities in a moving coil instrument

(d) None of these

(UPSSSC JE- 2016)

5. For accuracy of the instrument which is

necessary-

(a) Conformity

(b) Precision

(c) Both


(UTTARAKHAND –I 2013)

6. Energy meter runs slowly even if power is

not used. This error is called

(a) Speed error

(b) Phase error

(c) Creeping error

(d) None of these


7. A null type of instrument as compared to a

deflecting type instrument has]

(a) Higher accuracy

(b) Lower sensitivity

(c) Faster response

(d) All of the above

(MPJE 2016 Evening Shift)

8. The efficiency of electrical machines should

be calculated by measuring-

(a) Output and input

(b) Losses and output

(c) Losses and input

(d) Losses

(DMRC 2014)

10. The ratio error in current transformer is due to:

(a) Power factor of primary

(b) Wattles component of the current in the primary

(c) Exciting currents

(d) Leakage flux

(SSCJE 2013)

11. To minimize the errors due to lead and contact

resistance, low resistance used in electrical

measurement work are provided with

(a) Guard rings

(b) Four terminals

(c) Thick insulation

(d) Metal shields

(SSCJE 2015)

12. A 150 V moving iron voltmeter of accuracy class

1.0 reads 75 V when used in a circuit under standard

condition. The mssimum possible percentage error in

the reading is:

(a) 4.0

(b) 2.0

(c) 1.0

(d) 0.5

(JMRC 2012)

13. In order to achieve accuracy, how should

the slide wire of a potentiometer be?

(a) As long as possible

(b) As short as possible

(c) Very thin

(d) Very thick

(MPJE 2015)

14. Torque/weight ratio of an instrument

indicates:

(a) Selectivity

(b) Sensitivity

(c) Accuracy

(d) Fidelity



FUTURE SECURE INSTITUTE™ 15. A 0-10 A ammeter has a guaranteed accuracy of

1% of full scale deflection, the limiting error

while reading 2.5A will be

(a) 1%

(b) 2%

(c) 4%

(d) None of these

1. (Instruments and their Requirements)

(UPRVUNL 2014)

2.A torque is developed in an electro mechanical

energy conversion device, the value of which

depends upon:

(a) stator field strength and torque angle

(b) stator field and rotor field strength

(c) stator field and rotor field strengths and the

torque angle

(d) stator field strength only

(UPRVUNL 2014)

3………………instrument is from hysteresis and

eddy current errors.

(a) Electrostatics

(b) Moving Iron

(c) Moving coil-Permanent Magnet type

(d) Moving coil dynamometer type

(DMRC 2015)

4. Moving iron instruments can be used:

(a) To measure dc currents only

(b) To measure ac currents only

(c) To measure a.c. voltage only

(d) To measure a.c. and d.c. currents and voltage

(RPHED 2015)

5.Moving coil instrument, having coil resistance of

4.5Ω gives a full scale deflection of 30 mA. The

resistance connected in parallel with this instrument

to read up to 2.5A is:

(a) 6.46Ω

(b) 0.0346Ω

(c) 0.0546Ω

(d) 0.0625Ω

(SSCJE 2014, Morning Shift)

6. In a particular meter, the operating torque is

directly proportional to the current passing

through it, then the type of meter is:

(a) Moving iron

(b) Moving coil

(c) Electrostatic

(d) Induction

(SSCJE 2013)

7. In inducting instruments the springs are

mainly used to

(a) Conduct the current to the coils

(b) Hold the pivot in position

(c) Control the pointer movement

(d) Reduce the vibration of the pointer

(SSCJE 2013)

8. To maximize the driving torque in an

induction type instrument, flux produced by

shunt coil and series coil should be

(a) In phase with each other

(b) In quadrature with each other

(c) Displaced by 45º with respect to each

other

(d) Out of phase with respect to each other

(JMRC 2013)

9. What is a Weston frequency meter?

(a) Moving coil instrument

(b) Moving iron instrument

(c) Dynamometer type instrument

(UTTARAKHAND –II 2013)

10. Indicating instruments should be

(a) Undamped

(b) Critical damped

(c) Over damped

(d) Under damped

(MPJE 2016) Evening Shift

11. The effect of stray magnetic fields on the

actuating torque of a portable instrument is

the maximum when the operating field of the

instrument and the stray fields are

(a) Perpendicular

(b) Parallel

(c) Inclined at 60º

(d) Inclined at 30º

(MPJE 2015)

12. A moving iron instrument can be used for

current and voltage measurements?

(a) In AC circuit only

(b) In DC circuits only

(c) In both AC and DC circuit

(d) None of these

(MPJE 2015)



13. The controlling torque in power factor meter

is given by

(a) Spring control

(b) Sensor control

(c) Gravity control

(d) None of these

(MPJE 2015)

14. A 0-1 mA PMMC ammeter reads 4 mA in

circuits. Its bottom control spring snaps

suddenly. The meter will now read nearly:

(a) Zero

(b) 10 mA

(c) 2 mA

(d) 8 mA

(UPSSSC 2015)

15. Following is not an advantage of a permanent

magnet moving coil instrument

(a) It has a uniform scale

(b) It can be used without error for a

long period of time

(c) It has good damping torque

(d) Its range can be easily extended

(MPJE 2016 Morning Shift)

16. Energy savings potential of variable torque

application compared to constant torque

application is-

(a) Higher

(b) Minor

(c) Equivalent



17. Determine the absolute error of measurement

if measured value of a resistance = 20.65Ω

and true value = 20.55Ω.

(a) 0.1Ω

(b) 0.2Ω

(c) 0.3Ω

(d) 0.4Ω


20. The most efficient form of damping

employed in electric instruments is

(a) Air friction damping

(b) Fluid friction damping

(c) Eddy current daming



21. The moving system of an indicating type of

electrical instrument is subjected to

(a) a deflecting torque

(b) a controlling torque

(c) a damping torque



22. The type of instruments used mainly for

standardizing instruments in laboratories is

(a) Indicating instrument

(b) Integrating instrument

(c) Absolute instrument

(d) Recording instrument

( UPSSSC JE-2016)

23. Which torque is essential for indicating

instruments-?

(a) Deflecting

(b) Controlling

(c) Damping



24. Moving coil instruments have which one of the

following scales?

(a) Logarithmic scale

(b) Uniform scale

(c) Non-uniform scale

(d) Squared scale


25. The material of hair spring used in measuring

instruments is made of which of material of the

following:

(a) Copper

(b) Bronze

(c) Alnico

(d) None of these

(UPPCL 2016)

26. If a galvanometer is sensitive, it will provide

large deflection on providing-

(a) No current

(b) Large power

(c) Small current

(d) large voltage



(SSCJE 2010)

27. Swamping resistance is used to compensate error

due to-

(a) Stray magnetic field

(b) Large supply voltage

(c) Large supply frequency

(d) Temperature variations


1. Integration of unit ramp function gives

(a) Unit parabolic function

(b) Unit ramp function

(c) Unit doublet function

(d) None of these


2. If current through the operating coil of a

moving iron instrument is doubled, the

operating force becomes.

(a) One and a half times

(b) 2 times

(c) 3 times

(d) 4 times


3. In moving iron instruments, the iron moves

in a direction to cause

(a) Coil inductance to be constant

(b) Mutual inductance to be constant

(c) Minimum reluctance path

(d) Decrease in the flux passing through it


4. A moving coil instrument has a resistance of

10Ω and gives full scale deflection at 0.5 V

potential difference across it. How can it be

adopted to measure a current up to 100 A

(a) By connecting shunt resistance of

0.005Ω across the meter

(b) By connecting shunt resistance of

0.05Ω across the meter

(c) By connecting shunt resistance of 5Ω

across the meter

(d) By connecting shunt resistance of 10Ω

across the meter

(UPRVUNL 2015)

37. Which of the following statements is not an

advantage of electrodynamics instruments?

(a) Free from hysteresis errors

(b) Low power consumption

(c) Low accuracy

(d) Low sensitivity

(DMRC 2014)

38. The deflection torque can be produced by:

(a) Gravity control

(b) Spring control

(c) Air Friction

(d) Magnetically


39. Which of the following instruments has the

highest torque/weight ratio among the given

instruments?

(a) Attraction type MI instrument

(b) Repulsion type MI instrument

(c) Permanent magnet moving coil instrument

(d) Electrodynamometer instrument

(SSCJE 2014, EveningShift)

40. Moving coil (PNMC) and moving iron

instruments can be distinguished by observing its.

(a) range

(b) scale

(c) size of terminals

(d) pointer

(SSCJE 2013)

41. In reference to the figure, the voltage waveform

v(t) is measured by a PMMC, a PMMC combined

with bridge rectifier and a moving iron (MI)

instrument. Two lists are prepared thereafter:

Instrument list List of

instrument reading

A. PMMC i. 5

V

B. PMMC rectifier ii 2.75

V

C. M.I. iii 2.5

V

The correct option relating the instruments and

their reading is

(a) A – i, B – ii, C – iii

(b) A – iii, B – ii, C – i

(c) A – ii, B – iii, C – i

(d) A –iii, B-I, C – ii

(SSCJE 2008)

42. The scale of moving iron (M.I) instrument

ius-

(a) uniform

(b) Cramped

(c) Linear

(d) All the above

(SSCJE 2010)

43. The controlling torque in gravity controlled


FUTURE SECURE INSTITUTE™ meter is proportional to-

(a) cos θ

(b) sin θ

(c) tan θ

(d) θ

(UPSSSC 2015)

44. Damping torque is essential to

(a) Increase oscillate

(b) Reduce oscillation

(c) Maintain oscillation

(d) None of these

(UPSSSC 2015)

45. In an attraction type moving Iron instruments, the

damping torque is usually provide by

(a) Air friction damping

(b) Eddy current damping

(c) Fluid friction damping

(d) Capacitive damping

(UPSSSC JE -2016)

48. Which instruments have uniform scale-?

(a) Spring control instruments

(b) Gravity control instruments

(c) Both (a) and (b)


(UPSSSC JE -2016)

49. Watt-hour instrument is the type of-

(a) Indicting

(b) Integrating

(c) Recording


(UPSSSC JE -2016)

50. Induction type instruments are used in

(a) AC

(b) Dc

(c) Both


(UPSSSC JE -2016)

51. Which damping is most efficient-?

(a) Air friction

(b) Fluid friction

(c) Eddy current


4. (Ammeters and Voltmeters)

(UPRVUNL 2014)

2. Current in a circuit is measured using a

simple slide using. What will be voltage

drop per unit length? If the standard cell

is of emf 2.38 V balanced a length of 35

cm?

(a) 0.68 V/cm

(b) 0.068 V/cm

(c) 68 V/cm

(d) 6.8 V/cm

(DMRC 2015)

3. The measurement range of an ammeter

can be increased by using a:

(a) High resistance in shunt

(b) Low resistance in shunt

(c) High resistance in series

(d) Low resistance in series

(DMRC 2015)

4. For increasing the range of voltmeter,

one should connect a”

(a) High value resistance in series

with voltmeter

(b) Low value resistance in series with

voltmeter

(c) High value resistance in parallel

with voltmeter

(d) Low value resistance in parallel

with voltmeter

(SSCJE 2014, Evening Shift)

5. To increasing the range of an a.c.

ammeter you would use:

(a) A potential transformer

(b) An inductance across the motor

(c) A condenser across the meter

(d) Current transformer

(UPSSSC JE -2016)

6. An instrument which electric current is

known as-

(a) Voltmeter

(b) Rheostat

(c) Wattmeter

(d) Galvanometer




7. A d.c. voltmeter has a sensitivity of

1000Ω/watt. When it measure half full

scale in 100 V range, the current through

the voltmeter will be:

(a) 1 mA

(b) 0.5 mA

(c) 50 mA

(d) 100 mA


8. Two voltmeter of (0-300 V) range are

connected in parallel to a.c. circuits. One

voltmeter is moving iron type reads 200

V. If the other is PMMC instrument, its

riding will be:

(a) Zero

(b) 222 V

(c) 127.4 V

(d) Slightly less 200 V

(SSCJE 2013)

9. If a 110 V, Hz is applied across a PMMC

voltmeter of full-scale range 0-220 V and

internal resistance of 10 kΩ, reading of

the voltmeter will be

(a) 0 V

(b) 110√2 V

(c) 78 V

(d) 55 V

(SSCJE 2013)

10. A current of i = 6+10 sin(100θ πt) + 20

sin(200 πt) is flowing through a series

combination of a PMMC and moving

iron instrument. Ratio of the two currents

as registered by the M.I. and PMMC

meter is

(a) 1.81

(b) 3.11

(c) 2.82

(d) 2.63

(SSCJE 2012)

11. A potentiometer is used to measure the

voltage between to points of a D.C.

circuit, which is found to be 1.2 V. This

is also measured by a voltmeters, which

is found to be 0.9 V. The resistance of

the voltmeter is 60 kΩ. The input

resistance between two points.

(a) 60 kΩ

(b) 20 kΩ

(c) 45 kΩ

(d) 80 kΩ

(SSCJE 2012)

12. During the measurement of a low

resistance using a potentiometer, the

following readings were obtained:

Voltage drop across unknown

Resistance = 0.531 Volt.

Voltage drop across a 0.1 Ohm standard

resistance connected in series with the

unknown = 1.083 Volt. Value of the

unknown resistor is

(a) 49.03 milliohm

(b) 108.3 milliohm

(c) 20.4 milliohm

(d) 53.1 milliohm

SSCJE 2010)

13. An ammeter is obtained by shunting a

30 Ω Galvanometer with 30 Ω

resistance. What additional shunt should

be connected across it to double the

range?

(a) 15 Ω

(b) 10 Ω

(c) 5 Ω

(d) 30 Ω

(SSCJE 2010)

14. To increase the range of a voltmeter-

(a) A low resistance is connected in

series

(b) A low resistance is connected in

parallel

(c) A high resistance is connected in

series

(d) A high resistance is connected in

parallel

(JMRC 2012)

15. What is the main purpose of

potentiometer as device for?

(a) Comparing two voltages



(b) Comparing two currents

(c) Measuring a voltage

(d) Measuring a current

(JMRC 2012)

16. What are the main criteria to select

resistance of coils and slide wire in

Crompton potentiometer?

(a) 14 coil and slide wire all having

the same resistance

(b) 14 coils and slide wire but they

resistance of slide wire is half of that

of each coil

(c) 14 coils and slide wire all having

the different resistance

(d) 14 coils out of which 7 coils have

resistance which is twice that of

remaining 7 coils

(JMRC 2012)

17. A standard cell of 1.0185 V is used with

a slide wire potentiometer. The balance

was obtained at 60 cm. When an

unknown emf was connected, the

balance was obtained at 82 cm. What is

the magnitude of unknown emf?

(a) 1.39 V

(b) 0.79 V

(c) 13.9 V

(d) 7.45 V

(MPJE 2015)

18. A 0-15 V voltmeter has a resistance of

1000Ω, if it is desired to expand its range

0-15 V a resistance of………………….

Is connected in series with it.

(a) 3 k Ω

(b) 5 k Ω

(c) 9 k Ω

(d) 2 k Ω

(IOF 2014)

19. For increasing the range of voltmeter,

connect a

(a) Low value resistance in series with

voltmeter

(b) High value resistance in parallel

with voltmeter

(c) High value resistance in series

with voltmeter

(d) Low value resistance in parallel

with voltmeter

(UPSSSC 2014)

20. The internal resistance of a voltmeter is

20,000 ohms. If this voltmeter is

connected in series with a resistance and

a 220 volt supply is connected across the

combination, the voltmeter reads 200

volts. The value of the resistance is

(a) 200 Ω

(b) 4000 Ω

(c) 2000 Ω

(d) 20,000 Ω

(MPJE 2016, Evening Shift)

21. Which type of potentiometer consists of

two separate potentiometer circuits

enclosed in a common case?

(a) Gall Tinsley AC potentiometer

(b) Dry dale Tinsley AC potentiometer

(c) Campbell Larsen potentiometer

(d) Crompton potentiometer


25. Internal resistance of a micro-ammeter is 500

ohm. Resistance required to increase its range from

0-100 μA to 0-10 A will be approximately

(a) 0.05 Ω

(b) 0.005 Ω

(c) 0.5 Ω

(d) 5.0 Ω

(UPSSSCJE – 2016)

26. Range of ammeter can extend by connecting-

(a) a Shunt parallel to ammeter

(b) a Shunt in series to ammeter

(c) a Multiplier parallel to ammeter

(d) a Multiplier in series to ammeter

(DMRC 2016)

27. Clamp on ammeter is used for measurement of:

(a) Large alternating currents

(b) Small direct currents

(c) Small alternating currents

(d) Large direct currents

(DMRC 2016)


FUTURE SECURE INSTITUTE™ 28. An ammeter has a current range of 0-5 A, and its

internal resistance is 0.2Ω. In order to change the

range to 0-25 A, what should be the value of

resistance added and how it would connect with

meter (i.e. series/parallel)?

(a) (0.05Ω/series)

(b) (0.05Ω/parallel)

(c) (0.20Ω/parallel)

(d) (0.20Ω/Series)

(DMRC 2016)

29. The measurement range of an ammeter can be

increased by using a:

(a) High resistance in shunt

(b) Low resistance in shunt

(c) High resistance in series

(d) Low resistance in series

(DMRC 2016)

30. A permanent magnet moving coil ammeter has a

coil resistance of 99 ohm and Full scale deflection

(FSD) current of 0.1 mA. Shunt resistance is 1 ohm.

Current through the meter at 0.5 F.S.D. is:

(a) 0.007 mA

(b) 0.05 mA

(c) 0.023 mA

(d) None of these


31. The multiplying power of the shunt of a

millimeter is 8. If the circuit current is 200 mA. Then

current through the meter us

(a) 25 mA

(b) 200 mA

(c) 1600 mA

(d) 3200 mA

(UPRVUNL 2014)

34. What should be the properties and mode of

connection of the shunts and multipliers used to

increase the ranges of voltmeters and ammeters?

(a) Shunts- low resistance connected in parallel

with ammeters

(b) Shunt- high resistance, connected in series with

ammeters

(c) Multipliers- low resistance, connected in series

with voltmeters

(d) Multipliers- high resistance, connected in parallel

with voltmeters

(DMRC 2016)

35. By mistake voltmeter and ammeter are connected

as shown in the figure below:

(a) Only voltmeter will burn away

(b) Only ammeter will burn away

(c) Both voltmeter and ammeter will burn away

(d) None will burn away


36. In electrodynamometer ammeter, the deflection

of the pointer is proportional to

(a) mean of currents in fixed coil and moving coil

(b) square of the current in moving coil

(c) RMS value of current in fixed coil

(d) Mean -square of currents in fixed coil and

moving coil

(SSCJE 2013)

37. When a multiplier is added to an existing

voltmeter for extending its range, its electromagnetic

damping

(a) remains unaffected

(b) Increase

(c) Decreases

(d) Changes by an amount depending on the

controlling torque

(SSCJE 2013)

38. A voltmeter when connected across a D.C.

supply, reads 124 V. When a series combination of

the voltmeter and an unknown resistance X is

connected across the supply, the meter reads 4 V. If

the resistance of the voltmeter is 50 kΩ, the value of

X is

(a) 1550 kΩ

(b) 1600 kΩ

(c) 1.6 kΩ

(d) 1.5kΩ

(SSCJE 2009)

39. A DC ammeter ha resistance of 0.1Ω and current

range is 0 – 100A. If the range is to be extended to 0-

500A, then meter enquires shunt resistance of:

(a) 0.010Ω

(b) 0.011Ω

(c) 0.025Ω

(d) 1.0Ω

(SSCJE 2009)


FUTURE SECURE INSTITUTE™ 40. Which instrument has the lowest resistance?

(a) Ammeter

(b) Voltmeter

(c) Megger

(d) Frequency meter

(MPJE 2015)

41. A 0-300 V voltmeter has a guaranteed accuracy

of 1% on full scale reading. The voltage measured by

the instrument is 83 V. The percent limiting error is:

(a) 3.62

(b) 1.81

(c) 0.95

(d) 14.85


44. What will happen if a voltmeter is connected like

an ammeter in series of the load?

(a) The meter will burn out.

(b) The measurement will be too high.

(c) The same current will flow as would have been

with ammeter in circuit.

(d) There will be almost no current in the circuit.


45. The sensitivity of voltmeter using 0-5 mA meter

movement is

(a) 200 Ω/V

(b) 150 Ω/V

(c) 100 Ω/V

(d) 50 Ω/V

(UPSSSCJE –2016)

48. Internal resistance of an ideal ammeter is-

(a) Zero

(b) Infinite

(c) Small

(d) Big

(DMRC Electronic 2015)

49. A voltmeter is used.

(a) To measure current

(b) In series with the circuit

(c) In parallel with the circuit

(d) To measure coulombs

(LMRCSC/TO 2015)

50. A voltmeter gives 120 oscillations per minute,

when connected to the rotor of an induction motor.

The stator frequency is 50 Hz. The slope of the motor

is:

(a) 2%

(b) 5%

(c) 2.5%

(d) 4%

(LMRCSC/TO 2015)

51. A 10 mA ammeter has a resistance of 50 ohms. It

is to be converted to a 1 A ammeter. The value of

shunt resistance should be:

(a) 5 ohms

(b) 0.1 ohms

(c) 0.505 ohms

(d) 0.05 ohms


52. Series resistance required to read 0-250 V with a

moving coil instrument of internal resistance 2 ohm

and full scale deflection of 50 mA is

(a) 49998 Ω

(b) 4998 Ω

(c) 498 Ω

(d) 49.8 Ω

5. (Wattmeter and Maximum Demand Indicator)

(UPRVUNL 2013)

1. According to Blondel’s theorem, if a

network is supplied using ‘n’ conductor’ the

total power is the of the reading of n

wattmeter so arranged that a current coil of

each line and the corresponding pressure

coil is connected between that line and a

common point

(a) Sum

(b) Product

(c) Sum of product of two wattmeter

reading taken together

(d) Difference

(DMRC 2014)

2. The pressure coil of a wattmeter consists of:

(a) More number of turns of fine wire

(b) Less number of turns of fine wire

(c) Less number of turns of thick wire

(d) More number of turns of thick wire

(SSCJE 2014) Evening Shift

3. The least number of 1- ɸ wattmeter required

to measure total power consumed by an

unbalanced load fed from a 3ɸ, m 4 wire

system is:

(a) 2

(b) 3

(c) 4

(d) 1

(SSCJE 2013)



4. In a balanced 3-phases circuit, the line

current is 12 A. When the power is

measured by two wattmeter method, one

meter reads 11 kW while the other reads

zero. Power factor of the load is

(a) 0

(b) 0.5

(c) 0.866

(d) 1.0

(SSCJE 2012)

5. In a balanced 3-phases system, the current

coil of a wattmeter is inserted in line 1 and

the potential coil across 2 and 3. If the

wattmeter reads 100 W, the reactive power

drawn by the 3-phases load is

(a) 173.2 VAR

(b) 50 VAR

(c) 100 VAR

(d) 141.4 VAR

(SSCJE 2012)

6. In phantom loading arrangement, energy

consumption in the calibration test of

wattmeter is reduced because of

(a) The separate application of low voltage

supply across current coil

(b) No common point between the two

coils

(c) The reduced loss in current coil and

pressure

(d) The absence of load in the test set

(SSCJE 2007)

7. A dynamometer type wattmeter can be used

on-

(a) d.c.only

(b) a.c.only

(c) rectified a c only

(d) a.c. as well as d.c

(SSCJE 2015)

8. A dc voltmeter has a sensitivity of 100Ω/

volt when it measures half full scale in 100V

range, the current through the voltmeter will

be?

(a) 50 mA

(b) 1 mA

(c) 0.5 mA

(d) 100 mA

(SSCJE 2015)

9. If a dynamometer type wattmeter is

connected in an ac circuit, the power

indicated by the wattmeter will be:

(a) Instant Peak power

(b) Peak power

(c) Volt ampere product

(d) Average power

(JMRC 2012)

10. The resistance of a 125 W strain gauge

changes by 1 W for 400 micro strain. How

much is the gauge factor?

(a) 1.5

(b) 2

(c) 2.5

(d) 3

(UTTARAKHAND-II 2013)

11. An automatic power factor controller cannot

achieve

(a) Voltage control

(b) K VAR control

(c) kW control

(d) Pf control

(MPJE 2015)

12. In an electrodynamometer type wattmeter:

(a) The current coil is made fixed

(b) The pressure coil is fixed

(c) Both the coil are fixed

(d) Both the coil are movable

(MPJE 2015)

13. The power in a 3 phase four wire circuit can

be measured by using:

(a) 1 wattmeter

(b) 2 wattmeter

(c) 3 wattmeter

(d) 4 wattmeter

(MPJE 2015)

14. In a single phase induction type wattmeter, a

meter can be reversed by

(a) Reversing either the potential coil

terminal

(b) Reversing connections of both current

and potential coil circuits

(c) Reversing the supply terminals



(d) Reversing the load terminals

(MPJE 2015

15. One single phase wattmeter operating on

230 V and 5A for hours makes 1940

revolutions. Meter constant in revolution is

400. The power factor of the load will be:

(a) 1

(b) 0.8

(c) 0.7

(d) 0.6

(UPSSSC 2015)

16. In an electro dynamometer type Watt meter

if the voltage and current measured are

given by V = 100 sin 314t and i = 10 sin (

314 t - 60º) respectively, the reading (in

watts) will be

(a) 1000

(b) 500

(c) 250

(d) 433

(UPSSSC 2015)

17. In the measurement of 3 phase power by two

watt meter method, for an unbalanced load,

the power factor of the load is

(a) Cos[tan


18. Which of the following provide deflecting

force for voltmeters only?

(a) Electromagnetic effect

(b) Electrodynamics effect

(c) Magnetic effect

(d) Electrostatic effect


19. How many coils are there in a wattmeter?

(a) 2

(b) 3

(c) 4

(d) 1


20. A dynamometer wattmeter is rated at 10 A

and 100 V with a full scale reading of 1000

W. The inductance of the voltage circuit is

5mH and its resistance 3000 ohm. Voltage

across the current coil is negligible. At 50

Hz and zero power factors, the error in the

wattmeter at the VA reading will be-

(a) 0.325 W

(b) 0.523 VA

(c) 0.575 VA

(d) 0.604 W


21. If a dynamometer wattmeter is connected in

an ac circuit, the power indicated by the

wattmeter will be

(a) Volt-ampere product

(b) Average power

(c) Peak power

(d) Instantaneous power


22. A compensated wattmeter has its reading

corrected for error due to

(a) Frequency

(b) Friction

(c) Power consumed in current coil

(d) Power consumed in pressure coil

(DMRC 2016)

23. Power consumed by a balanced 3-phase, 3-

wire load is measured by two wattmeter

method. The first wattmeter reads twice that

of the second. Then what will be the load

impedance angle in radian?

(a) (π/6)

(b) (π/3)

(c) (π/2)

(d) (π/4)

(DMRC 2016)

24. For power measurement of three phase

circuit by two wattmeter method, when the

value of power factor is less than 0.5

lagging:

(a) One of the wattmeter will read zero.

(b) Both give the same readings

(c) One of the wattmeter connections

will have to be reversed

(d) Pressure coil of the wattmeter will

become ineffective

(SSCJE 2010)

25. Laboratory wattmeter’s are-

(a) Induction type

(b) Moving type



(c) Electrostatic type

(d) Electro- dynamometer type

(UPRVUNL 2014)

29. Single or one Wattmeter method can only be

used for

(a) Balanced three-phase load

(b) Imbalanced two-phase load

(c) Balanced one-phase load

(d) Imbalanced one-phase load

(UPRVUNL 2014)

30. In a single phase Dynamometer, the

instantaneous torque has a component of

power which varies as

(a) Twice

(b) Half

(c) Four times

(d) Three times

(UPRVUNL 2014)

31. Calculate the percentage error for a

wattmeter which is so connected that the

current coil is no the load side. The

wattmeter has a current coil of 0.03Ω

resistance and a pressure coil of 6000Ω

resistance. It is also known that the load

takes 20 A at a voltage of 220 V and 0.6

power factor.

(a) 0.45%

(b) 45%

(c) 5.5%

(d) 6.5%

(DMRC 2015)

32. The power in an unbalance 3-phase 4-wire

circuit can be measured by using a

……….method.

(a) 4 wattmeter

(b) 3 wattmeter

(c) 2 wattmeter

(d) 1 wattmeter

(SSCJE 2013)

33. Pharos diagram of load voltage (V), current

in pressure coil (Ip) and current in current

coil (Ic) is shown in the figure when an

electrodynamics wattmeter is used to the

wattmeter will be proportional to:

(SSCJE 2013)

34. A wattmeter is marked 15A/30A,

300V/600V and its scale is marked up to

4500 watts. When the meter is connected for

30 A, 600V, the point indicated 2000 watts.

The actual power in the circuit is

(a) 200 watts

(b) 400 watts

(c) 6000 watts

(d) 8000 watts

(SSCJE 2013)

35. In the measurement of power in a balanced

3-phase circuit by two-wattmeter method if

the two wattmeter show equal readings.

Then the power factor of the circuit is

(a) Zero

(b) Unit

(c) O.8 lagging

(d) 0.8 leading

(SSCJE 2013)

36. Two meters X and Y required 40 mA and 50

mA respectively for full scale deflection.

Then

(a) Both are equally sensitive

(b) Data are insufficient to comment

(c) X is more sensitive than y

(d) Y is more sensitive than X

(SSCJE 2008)

37. A dynamometer type watt meter responds

to the

(a) Average value of active power

(b) Average value of reactive power

(c) Peak value of active power

(d) Peak value of reactive power

(SSCJE 2009)

38. The moving coil in a dynamometer

wattmeter is connected

(a) In series with the fixed coil

(b) Across the supply

(c) In series with the load

(d) Any one of the above

(SSCJE 2015)

39. Three wattmeter method of power

measurement can be used to measure power

in:

(a) Both balanced and unbalanced

circuits

(b) Balanced circuits



(c) None of these

(d) Unbalanced circuits

(UTTARAKHAND-I 2013)

40. Which of the following is not a method of

resistance measurement?

(a) Ammeter- Voltmeter method

(b) Post- office box method

(c) Ohm- Meter method

(d) Two wattmeter method


41. While measuring power in a three phase

load by two wattmeter method, the reading

of two wattmeter are equal and opposite,

when

(a) Load is balanced

(b) Power factor is unity

(c) Phase angle is between 60º to 90º

(d) The load is purely inductive

(UPSSSCJE – 2016)

42. A which angle in two wattmeter method,

one wattmeter show zero readings-

(a) ɸ=0

(b) ɸ=60

(c) ɸ=90

(d) ɸ=45

(UPSSSCJE – 2016)

43. Which power factor results equal reading of

both wattmeter in 2 wattmeter method-

(a) Unit

(b) Half

(c) Zero


(UPSSSCJE – 2016)

44. While measuring power in a 3-phase load by

2 wattmeter method the readings of two

wattmeter are equal and opposite when

(a) Pf is unity

(b) Load is balanced

(c) Phase angle is between 60º and 90º

(d) The load is pure inductive

(DMRC 2014)

45. In dynamometer wattmeter the

compensation coil

(a) Has equal number of turnoff voltage

coil and is connected in series with

current coil

(b) Has equal number of turns of

current coil and is connected in

series with voltage coil

(c) Has equal number of turns of current


current coil

(d) Has equal number of turns of voltage


voltage coil

(SSCJE 2011)

46. A wattmeter is being tested under phantom

loading condition. If the wattmeter reading

is 60 W, the actual power consumed from

the supply, is

(a) Much higher than 60 W

(b) 60 W

(c) Much less than 60 W

(d) 30W

(LMRC SC/TO 2015)

47. A dynamometer type of wattmeter responds

to:

(a) R.m.s value of active power

(b) Average value of active power

(c) Average value of reactive power

(d) R.m.s value of reactive power

(UPSSSCJE 2016)

48. While measuring power in a 3-phase load by

2 wattmeter method the reading of two

wattmeter are equal and opposite when

(a) Pf is unity

(b) Load is balanced

(c) Phase angle is between 60º and 90º

(d) The load is pure inductive

1. (Energy Meter)

(DMRC 2014)

2. The major cause for creeping in energy-

meter is:

(a) Over compensation for friction

(b) Vibrations

(c) Stray magnetic fields

(d) Excessive voltage across the potential

coil

(UPSSSC 2014)



1. In which of the following instruments, a

disc is present?

(a) Ammeter

(b) Voltmeter

(c) Wattmeter

(d) Energy meter

(JMRC 2012)

2. The loss of charge method can be used

to measure which of the following?

(a) Resistance of shunt

(b) Resistance of shunt winding

(c) Insulation resistance of cable

(d) Resistance of transformer winding

(JMRC 2012)

3. In a single phase power meter what is

the phase difference between current in

the two pressure coils?

(a) Exactly 0º

(b) Exactly 90º

(c) Approximately 0º

(d) Approximately 90º

(UTTARAKHAND- II 2013)

4. A single [phase energy meter has a

constant of 1200 revolution/k Wh.

When a load of 200 W is connected, the

disc rotates at 4.2 revolutions per min.

If the load is on for 10 hours, the meter

records an excess of

(a) 0.1 kWh

(b) 0.2 kWh

(c) 1.0 kWh

(d) 2.0 kWh

(UPSSSC 2014)

5. The household energy meter is

(a) An indicating instrument

(b) A recording instrument

(c) An integrating instrument


(MPJE 2015)

6. The pressure coil of an energy meter

is……………..

(a) Purely resistive

(b) Purely inductive

(c) Highly resistive

(d) Highly inductive

(UPSSSC 2014)

7. The creeping is observed in

(a) Ammeter meter

(b) Wattmeter

(c) Energy meter

(d) Volt meter

(UTTARAKHAND- I 2013)

8. The meter constant of a single phase

energy meter is 500 rev/kwh the meter

takes 86 seconds to make 50 revolutions

while measuring a full load of 4.4

kilowatt. The percentage error in the

meter is

(a) -2.43%

(b) 2.43%

(c) -4.86%

(d) 4.86%

(SSCJE 2011)

12.In an induction type energy meter,

everything else remaining same, if the

radial distance of the brake magnet

poles from the spindle is decreased by

10%, the rotational speed of the disc

will……………………...approximately

.

(a) Increased by 23.5%

(b) Decrease by 10.6%

(c) Decrease by 19.4%

(d) Increase by 11%

(UTTATRAKHAND – I 2013)

13.The disc of domestic supply energy meter is made

of which material?

(a) Zinc

(b) Copper

(c) Aluminum

(d) Silver

(UPPCL 2016)

1. The energy meter used in homes is an

example of-

(a) Indicating instrument

(b) Comparison instrument

(c) Recording instrument

(d) Integrating instrument

(SSCJE 2017)

2. The household energy meter is

(a) Recording instrument



(b) None of these

(c) Indicating instrument

(d) Integrating instrument

(UPRVUNL 2014)

17. In a single phase induction type energy meter, the

deflecting torque is the true power in the circuit.

(a) Proportional to

(b) Equal to

(c) Greater than

(d) Less than

(DMRC 2015)

18. If an induction type energy meter runs fast, it

can be slowed down by:

(a) Lag adjustment

(b) Light load adjustment

(c) Adjusting the position of braking

magnet and making it come closer to

the centre of the disc

(d) Adjusting the position of braking

magnet and making move away from

the centre of the disc.


19. Two holes are drilled in the disc on a

diameter of energy-meter to

(a) Increase ventilation

(b) Reduce the weight of disc

(c) Eliminate creeping on no-load

(d) Increase deflecting torque

7.(Miscellaneous Measuring Instruments)

(UPRVUNL 2015)

1. In a megger, controlling torque is

provided by:

(a) Spring

(b) Gravity

(c) Coil

(d) Eddy current

(DMRC 2015)

2. When testing an electric iron on

megger, the reading of the megger

is infinity. This indicates:

(a) Short circuit of heating

element

(b) Short circuit of supply

terminals

(c) Open circuit of heating

element

(d) Loose terminal connection

(DMRC 2015)

3. When external circuit is open, on

moving the handle, the pointer of

megger indicates:

(a) Zero

(b) Very low resistance

(c) Very high resistance

(d) Infinity

(SSSCJE 2014, Evening Shift)

4. Speed of the megger is kept at:

(a) 120 rpm

(b) 140 rpm

(c) 160 rpm

(d) 100 rpm

(SSCJE 2012)

5. Which of the following does not

employ a null method of

measurement?

(a) Megger

(b) Dc potentiometer

(c) Kelvin double bridge

(d) AC potentiometer

(SSCJE 2011)

6. Megger is an instrument by which

we can measure

(a) High resistance

(b) Low resistance

(c) High current

(d) High voltage

(SSCJE 2011)



7. With the decrees in the strength of

the permanent magnet in an

insulation Megger due to ageing,

Megger reading will

(a) Be lowest than actual

(b) Be higher than actual

(c) Remain unaffected

(d) Fluctuate rapidly

(SSCJE 2015)

8. Which instrument is used to

measure the high resistance?

(a) Kelvin’s Double bridge

(b) Carey-Foster bridge

(c) Megger

(d) Wheat stone bridge

(JMRC 2012)

9. When a capacitor is connected to

the terminal of a ohm meter, the

pointer indicated a low resistance

initially and finally came to infinity

position. What does this slowly

about the capacitor?

(a) Short circuit

(b) All right

(c) Faculty

(d) Open

(JMRC 2012)

10. The dead zone in pyrometer is

0.125% of span. The calibration is

400ºC to 100ºC. What temperature

change might occur before it is

detected?

(a) 0.0125ºC

(b) 0.75ºC

(c) 0.4ºC

(d) 1ºC

(JMRC 2012)

11. In measuring a resistance by

voltmeter-ammeter method, the

voltmeter can be connected either

across supply or across the

resistance. If the resistance is low,

then where the voltmeter should be

connected?

(a) Across the supply

(b) Across the resistance

(c) Either in two position

(d) Preferably across the supply


12. To measure insulating resistance of

equipments of voltage rating up to

440 V the megger generator must

generate

(a) 220 V

(b) 440 V

(c) 500 V

(d) None of these


13. A megger is to measure insulation

resistance of a cable. The cable

should be connected to

(a) Battery

(b) DC supply

(c) AC supply

(d) No supply


14. A megger is basically a/an

(a) Moving iron type instrument

(b) Moving coil type instrument

(c) Hot wire instrument

(d) Electrolytic instrument

15. Piezo meter is used to measure

(a) Very high pressure

(b) Very low pressure

(c) Displacement

(d) None of these


16. Which of the following device is

used to measure flow in an open

channel?

(a) Venturimeter

(b) Rota meter

(c) Orifice

(d) Pitot tube

(MPJE 2015)

17. A megger is usually:

(a) Moving iron type instrument

(b) Electro-static type instrument

(c) Hot-wire type instrument

(d) Moving coil type instrument

(MPJE 2015)



18. A meggar is used for measurement

of:

(a) Low valued resistance

(b) Medium valued resistance

(c) High valued resistance,

particularly insulation

resistances


(IOF 2014)

19. The limitation of the voltage

multiplying circuit is that

(a) The output has high ripple

content

(b) High output voltage is difficult

to obtain

(c) High output current is

difficult to obtain

(d) The size of the captors

becomes very large

(UPSSSC 2015)

20. In which type of frequency meter,

the frequency is found when the

torque in the moving coil becomes

zero?

(a) Vibrating reed type

(b) Permanent Magnet moving

coil type

(c) Moving iron type type

(d) Electrical resonance type


21. Which of the following method

used for measuring high resistance?

(Given: above 100kΩ).

(a) Megger Method

(b) Ohmeter Method

(c) Potentiometer Method

(d) Wheat stone bridge Method


28. Megger is used for measure

(a) Very high resistance or

insulation resistance

(b) Low resistance

(c) High resistance

(d) Very low resistance

(UPPCL 2016)

29. Resistance can be measured by-

(a) Ohmmeters

(b) Resistance bridge

(c) Wattmeters

(d) Ampere-hour meters

(UPPCL 2016)

30. In a meggar, the deflection of moving coil

depends on-

(a) Applied voltage

(b) Inverse of applied voltage

(c) The ration of currents in the coil

(d) The product of currents in the coils

(SSCJE 2008)

5. Megger is an instrument to measure:

(a) A very low resistance

(b) Insulation resistance

(c) Q of coil

(d) Inductance of coil


6. The insulation resistance test in performed

on power lines with

(a) Ohm meter

(b) Earth tester

(c) Megger

(d) Any of these

(UPSSSC JE- 2016)

7. If an ohm meter reading immediately goes

practically to zero and stays there while

checking a capacitor, the capacitor is

(a) Leaky

(b) Short circuited

(c) Open circuited

(d) satisfactory

(UPVUNL 2014)

36.The insulation resistance of an

installation is measured by a

(a) Multimeter

(b) Wheat stone bridge

(c) earth tester

(d) Megger

(UPVUNL 2014)

37. Which among the following is not a method for

measurement of high resistance?

(a) Direct deflection method

(b) Megohm bridge

(c) Megger

(d) Loss of current method

(SSCJE 2011)

39. Megger is an instrument used for measurement

of:

(a) High resistance

(b) Medium resistance

(c) Low resistance


FUTURE SECURE INSTITUTE™ (d) Leakage current

(IOF 2014)

40. The pressure coil consist of

(a) More number of turns of fine wire

(b) More number of turns of thick wire

(c) Less number of turns of fine wire

(d) Less number of turns of thick wire

8. (Electronic Instruments)


4. In a Cathode Ray Tube, the focusing anode is

located

(a) After accelerating anode

(b) Between pre-accelerating and accelerating

anodes

(c) Before pre-accelerating anode

(d) Just after electron-gun

(SSCJE 2015) 5. Modern electronic multimeters measure resistance

by?

(a) Using an electronic bridge compensator for

nulling

(b) Using a bridge circuit

(c) Using a electrical bridge circuit

(d) Forcing a constant current and measuring the

voltage across the unknown resistance

(SSCJE 2015)

2. A CRO screen has ten divisions on the

horizontal scale. If a voltage signal 5 sin

(314t + 45º) is examined with a line base

setting of 5 msec/dic, the number of cycle of

signal displayed on the screen will be?

(a) 0.5 cycle

(b) 10 cycle

(c) 2.5 cycle

(d) 5 cycle

(UTTARAKHAND – II 2013)

3. Which meter is suitable for the measurement

of 10 m V at 50 MHz?

(a) Moving iron voltmeter

(b) CRO

(c) Electrostatic voltmeter

(d) VTVM


4. A CRO cannot be used for direct

measurement of

(a) Voltage

(b) Current

(c) Frequency

(d) Power


5. Horizontal deflection plates of CRO are

placed generally:

(a) Horizontal

(b) Vertical

(c) Diagonal

(d) (a) or (b)


6. Lissajous pattern obtained on a CRO screen

is a circle. Frequency of two signals are

(a) Equal

(b) Unequal

(c) Zero

(d) Infinity


7. In the case of PMMC rectifier type

instruments, the deflecting torque is

proportional to:

(a) Average value of AC current

(b) RMS of AC

(c) Instantaneous value

(d) Peak value

(MPJE 2015)

8. Which meter is suitable of the measurement

of 10 mV at 50 MHz?

(a) Moving iron voltmeter

(b) VTVM

(c) Moving coil voltmeter

(d) CRO

(MPJE 2015)

9. The high torque to weight ratio in an analog indicating instrument indicates: (a) High friction loss (b) Low friction loss (c) Not related to friction loss (d) None of the above


10. What is the resolution of 4-digit digital instrument? (a) 0.002% (b) 0.005% (c) 0.1% (d) 0.01%


17. A VTVM can be used to measure

(a) Dc voltage only


FUTURE SECURE INSTITUTE™ (b) Ac voltage only

(c) Both (a) and (b)


(IOF 2014)

18. The essential condition for the Paschen’s law to

be valid is that

(a) Voltage must be D.C

(b) Voltage must be A.C.

(c) Temperature must be constant

(d) Humidity must be low

(UPRVUNL 2015)

19. Which of the following cannot be measured by

multimeters?

(a) Frequency

(b) Current

(c) Resistance

(d) Voltage

(DMRC 2014)

20. LVDT is a:

(a) Displacement transducer

(b) Velocity transducer

(c) Acceleration transducer

(d) Pressure transducer


21. In a CRO, a sinusoidal waveform of a certain

frequency is displayed. The value of the

quantity that can be made out by observation

is

(a) RMS value of the sine wave

(b) Average value of the sine wave

(c) Form factor of the sine wave

(d) Peak-peak value of the sine wave


22. The technique of adding a precise amount of

time between the trigger point the beginning

of the scope sweep in a CRO is known as

(a) Free running sweep

(b) Delayed sweep

(c) Triggered swap

(d) Non-sawtooth sweep

4


23. Optical pyrometer is used to measure

(a) Light intensity

(b) Low temperature

(c) High temperature

(d) Light intensity & High temperature

(MPJE 2015)

24. An LVDT is used to measure displacement.

The LVDT feeds a voltmeter of 0.5V range

through a 250 gain amplifier. For a

displacement 0.5 mm the output of LVDT is

2 mV. The sensitivity of instrument is:

(a) 0.1 V/mm

(b) 0.5 V/mm

(c) 1 V/mm

(d) 5V/mm

(UPSSSCJE – 2016)

28. Cathode of CRO is coated with-

(a) Alkali material

(b) Thorium oxide

(c) Copper oxide

(d) Barium oxide

(UPSSSCJE – 2016)

29. A CRO can be used to measure-

(a) a.c. voltage

(b) d.c. voltage

(c) Frequency



30. In a 3 ½ digit voltmeter, the largest number that

can be read is:

(a) 1999

(b) 5999

(c) 9999

(d) 0999


31. A digital voltmeter has a read-out range from 0 to

9999 counts. When full scale reading is 9.999 V, the

resolution of the instrument will be

(a) 100 mV

(b) 99 mV

(c) 9 mV

(d) 1 mV


32. Match of the Lists L-I and L-II.

List-I

List-II


FUTURE SECURE INSTITUTE™ 1. Bolometer

A. Flow

2. H- Bridge

B. Dispalcement

3. LVDT

C. Radiation

4. Anemometer

D. DC Motor

1 2 3 4

(a) C D B A

(b) D C A B

(c) A C B D

(d) D C B A


33.In a CRO which of the following is not a part of

election gun.

(a) Cathode

(b) Grid

(c) accelerating anode

(d) X-Y plates

(IOF Electronic 2014)

34.An oscilloscope is basically designed to convert

(a) Visual signals to electrical signals

(b) Sound signals to electrical signals

(c) Electrical signets to visual signals

(d) Sound signals to visual signal

9. (Measurement of Resistance, Inductance and

capacitance)

(UPRVUNL 2014)

1. In order to measure the dielectric losses of a

capacitor, which one of the following AC

bridges is used?

(a) Anderson Bridge

(b) Hay’s bridge

(c) Schering bridge

(d) Wien’s bridge

(UPRVUNL 2014)

2. Which expression depicts the sensitivity (S)

of a Wheatstone Bridge?

(a) S = D/I

(b) S = DI

(c) S = D + I

(d) S = D – 1

(DMRC 2014)

3. Schering bridge is used to measure:

(a) Dielectric loss

(b) The inductance

(c) Low resistance

(d) Mutual inductance

(JMRC 2012)

4. To measure the resistance of about 8 Ω

which instrument should be used?

(a) Kelvin’s double bridge

(b) Wheatston’s bridge

(c) Meggar

(d) Wattmeter

(IOF 2014)

5. Low resistance is measured by

(a) De sauty’s bridge

(b) Maxwell’s bridge

(c) Kelvin’s bridge

(d) Wien bridge


6. Schering bridge is used to measure

(a) Frequency

(b) Inductance

(c) Capacitance

(d) Mutual inductance


7. Which method requires a standard capacitor

in terms of which the self-

(a) Anderson Bridge

(b) Hays Bridge

(c) Heaviside-Campbell Bridge

(d) Owens Bridge


8. Which method is especially suitable for the

measurement of small inductance?

(a) Kuriyama method

(b) Butterworths method

(c) Felicia method

(d) Campbell’s method


9. In which type of instrument the moving coil

consists of a single loop of fine bronze or

platinum silver wire?

(a) Schering and Schmidt galvanometer

(b) Darsonval galvanometer

(c) Campbell galvanometer

(d) Duddell moving coil galvanometer




10. ………………..circuit is used to make

precise measurement of a resistors value

using resistors, voltage source and a

galvanometer

(a) Wheatstone bridge

(b) Wien bridge

(c) Carey Foster bridge

(d) Kelvin bridge


13.Hay bridge is suitable for measuring following

type of inductance

(a) having Q greater than 10

(b) having Q less than 10

(c) having any value of Q

(d) having phase angle of reactance very large.


14.The dielectric loss of a capacitance can be

measured by

(a) Hay bridge

(b) Maxwell bridge

(c) Anderson bridge

(d) Schering bridge


11. For measurement of low resistance, the

bridge used is

(a) Wheatstone

(b) Kelvin

(c) Maxwell

(d) Anderson


12. The Maxwell bridge is used for measuring

(a) Capacitance

(b) Dielectric loss

(c) Inductance

(d) Phase angle

(UPPCL 2016)

13. The unknown inductance is measured in

terms of……………………..in the case of

Anderson bridge.

(a) Known resistance and capacitance

(b) Known inductance

(c) Known resistance

(d) Known capacitance and inductance

(DMRC 2016)

14. In a galvanometer, the deflection becomes

one half when the galvanometer is shunted

by a 20 ohm resistor. The galvanometer

resistance is:

(a) 50 ohm

(b) 10 ohm

(c) 40 ohm

(d) 20 ohm


19. The AC bridge used for measurement of

dielectric loss of capacitor is

(a) Anderson bridge

(b) Schering bridge

(c) Wien bridge

(d) Hay’s bridge

(DMRC 2014)

20. A Q-meter measure:

(a) Loss in a capacitor

(b) Schering bridge

(c) Wien bridge

(d) Hay’s bridge


21. Which one of the following bridge is

generally used for measurement of

frequency and also capacitance?

(a) Owen’s bridge

(b) Schering bridge

(c) Wien bridge

(d) Hay’s bridge


22. A wheat stone bridge has ratio arm of 1000Ω and

100Ω resistances, the standard resistance arm consist

of 4 decades resistance boxes of 1000, 100, 10, 1Ω

steps. The maximum and minimum values of

unknown resistance that can be determined with this

setup are:

(a) 11110 Ω

(b) 10000 Ω, 10 Ω

(c) 111100 Ω, 10 Ω

(d) 111100 Ω,1 Ω

(SSCJE 2017)

22. Which of the following a.c. bridges is

preferred fot the measurement of

inductance having high Q-factor?

(a) Hay bridge

(b) Maxwell bridge

(c) Desauty bridge

(d) Wien bridge



(UPSSSC 2014)

23. Relative permittivity can be measured

by…………………Bridge

(a) Wheat stone

(b) Hays

(c) Schering

(d) Density’s

(SSCJE 2015)

24. In the Maxwell as shown in the figure

below the value of resistance Rx and

inductance Lx of a xoil are to be

calculated after balancing the bridge. The

component values are shown in the fig at

balance. The values of Rx and Lx will

respectively be:

(a) 75 ohm, 150 mH

(b) 75 ohm, 75 mH

(c) 37.5 ohm, 75 mH

(d) 375 ohm, 75 mH

(UPSSSCJE- 2016)

25. Maxwell bridge is used to measure

(a) Inductance

(b) Capacitance

(c) Frequency


(UPSSSCJE- 2016)

26. The bridge used for the measurement of

the value of the capacitance is

(a) Wien’ bridge

(b) Wheatstone bridge

(c) Schering bridge

(d) Hay’s bridge

10. (Elements of process

Instrumentation)


1. An inverse transducer converts (a) Electrical energy to any other form of

energy (b) Electrical energy to light energy (c) Mechanical displacement into

electrical signal (d) Electrical energy to mechanical form


2. A strain gauge is a passive transducer and is employed for converting (a) Pressure into change in resistance (b) Force into displacement (c) Mechanical displacement into a

change of resistance (d) None of the above

(UPSSSC 2014)

3. Synchro is (a) Parabolic transducer (b) An angular position transducer (c) A synchronizing transducer (d) A variable transducer

(MPJE 2015)

4. The thermocouple instruments do not have:

(a) High sensitivity

(b) Absence of frequency error

(c) Independence of ambient temperature

(d) High degree of measuring accuracy


5. What is the order of minimum displacement

that can be measured with capacitive

transducers?

(a) 1 mm

(b) 1 μm

(c) 1 X 10ˉˡ²

(d) 1 cm


6. The dynamic characteristics of capacitive

transducer are similar to those of

(a) Low-pass filter

(b) High-pass filter

(c) Notch filter

(d) Band-stop filter

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