Mock Board Examination in Electronics d

7/27/2019 Mock Board Examination in Electronics d

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MOCK BOARD EXAMINATION IN

ELECTRONICS ENGINEERING (D)June 8, 2009

1. What is the stunt value needed to make a 50 0-1 mA meter into a 0-50 mA meter?

a. 1 b. 1.01 c. 5.55 d. 1.11

2. What are the two methods of expressing theSensitivity of a meter?

a. /Vb. full scale deflectionc. full scale currentd. a and c only

3. What do pointers or underdamped meters do?

a. Oscillate above and below the valueb. Move too fast to indicate valuec. Move to the correct reading rapidly but

does not overshootd. Move slowly and will not indicate rapid

variations adequately

4. What do pointers on overdamped meters do?a. Oscillate above and below the valueb. Move too fast to indicate valuec. Move to the correct reading rapidly but

does not overshootd. Move slowly and will not indicate rapid

variations adequately

5. Indicate which is not a way producing dampingin meters.

a. shunt coilb. multiplierc. aluminum coil formd. air paddle

6. Which is the most sensitive meter from amongthe choices?

a. 0-50 Ab. 0-10 mAc. 0-1 mA

d. 0-100 mA

7. What is the /V sensitivity of a 0-2 mA meter?a. 500 /Vb. 40 k /Vc. 50 /Vd. 5 k /V

8. What is the /V sensitivity of a 0-25 A meter?a. 500 /Vb. 40 k/Vc. 50 /Vd. 5 k/V

9. What would be the value of the multiplier usedwith a 50-A movement, 300-V meter?

a. none of theseb. 20 k

c. 0.015 d. 6 m

10. If a 20 k/V meter with 5k internal resistanceis used in an ohmmeter with 3V battery, whatinternal resistance is required in the meter toproduce proper zeroing?

a. 60 kb. 20 kc. 16.67 d. none of these

11. On most ohmmeters where is the 0-

graduation?a. far leftb. far rightc. both left and rightd. none of these

12. On what range on multirange ohmmeters is themeter most likely to be dangerous to equipmentbeing tested?

a. High Rb. Mid Rc. none of thesed. Low R

13. What does VOM mean?a. Volt-ohm-milliammeterb. Volt-ohm-milliampere meterc. Volt-ohm-meterd. none of these

14. What is required to convent a dc EVM to an ac-reading EVM?

a. DC to AC converterb. AC probec. both AC probe and DC to AC

converterd. none of these

15. The time interval that a waveform is high (or low)is the __________ of the signal.

a. pulse widthb. pulse lengthc. pulse positiond. duty cycle

16. A Wheatstone bridge is balanced ifa. the ratio of resistors on one side

of the bridge is one while theratio of resistors on the otherside is infinity

b. the ratio of resistors on one sideof the bridge is greater than the


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ratio of resistors on the otherside

c. the ratio of resistors on one side

of the bridge equals the ratio ofresistors on the other sided. the bridge uses identical

resistors

17. The pointer of an indicating instrument is in thefinal deflected position, the _________ is zero.

a. deflecting torqueb. controlling torquec. damping torqued. frictional

18. A moving system force in analog instrumentswhich causes the moving system to deflect fromits zero position.

a. Deflecting forceb. Damping forcec. Return-to-zero forced. Controlling force

19. A moving system force in analog instrumentswhich ensures that the deflection of the pointerfor a given value of measured quantity alwayshas the same value.

a. Damping forceb. Controlling forcec. NRZ forced. Deflecting force

20. All voltmeters except one of the following areoperated by the passage of current.

a. Moving-ironb. Dynamometerc. Electrostaticd. Permanent-magnet moving coil

21. Disc is made of what material in eddy currentdamping?

a. Conductor and non-magneticmaterial

b. Conductor and magnetic

materialc. Non-conductor and non-

magnetic materiald. Non-conductor and magnetic

material

22. The time interval between pulses is calleda. pulse frequencyb. pulse delayc. pulse durationd. pulse period

23. An oscilloscope provides easy measurement of

________ values.a. Instantaneousb. Rms

c. peak to peakd. average

24. An element in electronics which serves as aprotection against overload?a. Resistorb. Transistorc. Semiconductord. Fuse

25. How does an ohmmeter behave if its positivelead is connected to the cathode of a diodewhile negative to anode?

a. Has infinite high resistanceb. Has unstable resistancec. Has very low resistanced. Has decreasing resistance

26. As you increase the doping level of a crystaldiode its voltage________.

a. destabilizersb. decreasesc. increasesd. stabilizers

27. Which are the three terminals of a bipolartransistor?

a. cathode, plate and gridb. base, collector and emitterc. input, output and ground

d. gate, source and sink

28. How do zener diodes widely used?a. Current limitersb. Variable resistorsc. Voltage regulatorsd. Power collectors

29. The region in an electronic transistor that islightly doped and very thin is referred to the

________.a. collector-baseb. collector

c. based. emitter

30. A transistor acts as ________ when saturated.a. open circuitb. very low resistancec. very high resistanced. variable resistance

31. In semiconductor technology, the characteristicof a transistor in cut-off refers to a conditionwhen _________.

a. the transistor is at its operating

point b. no current flows from emitter tocollector


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c. there is no base currentd. maximum current flows from

emitter to collector

32. Which is the principal characteristic of a tunneldiode?

a. A very high PIVb. A high forward current ratingc. A high forward resistanced. A negative resistance region

33. A type of servo whose goal is to control theposition of the load.

a. Control servob. Position servoc. Load servod. None of these

34. Thermocouple an electrical temperaturesensing device which is composed of a pair ofdifferent kinds of metal wires joined together inthree complete loops.

a. Thermocoupleb. Thermowirec. Thermopaird. Thermodynamics

35. One of the most common mechanicalconfiguration in robotics.a. Hydraulic

b. Hydropneumaticc. Pneumodraulicd. Pneumatic

36. A basic requirement of a closed-loop system(not present in open-loops) that present loadposition to be sensed.a. Groundb. Shortc. Feedbackd. None of these

37. A French scientist in 1852 who first coined the

word gyroscope.a. Leon Gyronelb. Leon Foucaultc. Francois LeFoltd. None of these

38. One advantage of hydraulic actuator in industrialrobots.a. great force capacity handling heavy loadsb. light loadsc. fast reactiond. none of these

39. Two actuator types used in industrial robots.a. Pneumatic and hydraulic armb. Pneumatic and jointed arm

c. Hydraulic and jointed armd. None of these

40. A servo characteristic which is the time it takesbetween input signal and actual movement ofthe load.a. Precision timingb. Resolution periodc. Time lagd. None of these

41. A servo characteristic that is undesirable and isreduced through the use of high gain amplifiers.a. None of theseb. Resolution periodc. Precision timingd. Time lag

42. A type of synchro used in systems requiringlarge amounts of power and a high degree ofaccuracy.a. Tri-speed synchrob. System synchroc. Accurate synchrod. Differential synchro

43. Tri-speed Synchro system a type of synchrosystem that is used to transmit very largequantities of data.a. Tri-speed synchro system

b. System synchro systemc. Accurate synchro systemd. Differential synchro system

44. The special requirement of the pulse-countingaccelerometer is designed for ___.a. Analog datab. Digital datac. Special datad. None of these

45. Open-loop it is a control system that iscontrolled directly, and only, by an input signal.

a. Closed-loopb. Open-loopc. Directly-controlledd. Signal-controlled

46. The heart of any normal computera. Microcontrollerb. electronic heartc. microprocessord. computer heart

47. Powered one of the first portable electroniccalculators

a. 8088b. 4004c. 80386


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d. 80486

48. MIPS is related to ______

a. clock speedb. the process done by themicroprocessor

c. wire velocityd. memory

49. Sends address to memorya. data busb. control busc. address busd. USB

50. The simplest ALUa. 8-bit adderb. 8-bit dividerc. 8-bit multiplierd. 8-bit logic

51. Allows multiple outputs to connect a wire, butonly one of them actually drive a 1 or a 0 onto

the linea. disconnectorb. tri-state bufferc. connectord. register

52. Which is not a function of a control bus?

a. tell the input/outputregisters to latch thevalue currently on thedata bus

b. tell the instructionregister to latch thevalue currently on thedata bus

c. tell the program counterto increment

d. tell the program counterto reset to zero

53. Contains bytes of information, and the

microprocessor can read or write to those bytesdepending on whether the RD or WR line issignaled.

a. ROMb. PROMc. RAMd. DRAM

54. When the microprocessor starts, it beginsexecuting instructions it finds in the

a. DOSb. BIOSc. AUTOEXEC.BAT

d. SYSTEM.INI

55. A situation or a term used where instructionexecution overlap.

a. overflow

b. pipelined architecturec. overlapped instructionsd. execution overlap

56. Which of the following is not a basic type ofcircuit?

a. the R-circuitb. the C-circuitc. the L-circuitd. the R-L-C-circuit

57. In each case of the basic type of circuit, currentwill depend upon ___________.I. magnitude of emfII. Multiplying factorsIII. corresponding ohmic valuesIV. Corresponding inductance values

a. I and IIb. III and IVc. II and IIId. I and III

58. What is the unit of inductance?a. Faradb. Ohmc. Henryd. Mho

59. Unit of capacitance.a. Faradb. Ohmc. Henryd. Mho

60. Unit of reactance.a. Faradb. Ohmc. Henryd. Mho

61. Unit of admittance.a. Faradb. Ohmc. Henryd. Mho

62. There are ____ possible series combinations ofR, L, and C.

a. 3b. 5c. 4d. 6

63. The behavior of a pure resistor in an a-c circuitis ___________ to that in d-c circuit.a. not similar


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b. may be similarc. sometimes similard. exactly similar

64. Current and voltage phasors are ________ inresistor circuits.

a. sometimes in phaseb. never in phasec. always in phased. out-of-phase

65. A pure inductor in an a-c circuit takes a currentthat ________.

a. leads the impressed emf by exactly 90electrical degrees.

b. lags behind the impressed emf byexactly 90 electrical degrees.

c. leads the impressed emf by thecomputed electrical degrees.

d. lags behind the impressed emf by thecomputed electrical degrees.

66. In a system with MOS devices, the main busloading factor is likely to be

a. Resistiveb. Currentc. Capacitived. Static charge

67. Which is not true regarding a CMOS inverter?

a. Essentially no current flows for logic 0 orlogic 1 input

b. For devices of similar dimensions pmosis slower than nmos

c. Full logical 0 and 1 levels are presentedat the output

d. Increasing the input frequency,decreases the power dissipation

68. In MOS devices, the oxide is usuallya. MnOb. SiOc. SiO2

d. H2O

69. Material usually used as gate of MOS for IC.a. Monocrystalline siliconb. Goldc. Polysilicond. Platinum

70. A CMOS with parallel pmos and complementaryseries nmos is equivalent to logical

a. nand gateb. nor gatec. and gate

d. or gate

71. A CMOS with series pmos and complementaryparallel nmos is equivalent to logical

a. nand gate

b. nor gatec. and gated. or gate

72. Which of the following is the probable output ifall inputs of a TTL gate are binary 1?

a. Interdeterminateb. Determinablec. Binary 1d. Binary 0

73. Which is not an advantage of CMOS over TTLlogic family?

a. Lower power dissipationb. Greater fan-outc. Lower propagation delayd. Greater packing density

74. A __________ is a junction field effect transistorwith a Schottky barrier instead of a normalsemiconductor junction.

a. biFETb. MOSFETc. MESFETd. JUGFET

75. It is a type of ROM the contents of which can be

erased by exposure to ultraviolet radiation.a. EPROMb. PROMc. EEPROMd. EAPROM

76. It is a data manipulated by a computer program.a. Source programb. Databasec. Object programd. Language

77. It is a program written in a language

understandable by human.a. Source programb. Databasec. Object programd. Language

78. A program written in machine language.a. Source programb. Databasec. Object programd. Language

79. A program that translates instructions written in

assembly language into machine code.a. Assemblerb. Interpreter


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c. Compilerd. Translator

80. Invented computer mouse in 1964.a. Douglas Engelbartb. R G Sweetc. Allen and Gibbonsd. Bryant Rogers

81. Invented fiber optics communications in 1966.a. Douglas Engelbartb. R G Sweetc. Kao and Hockhamd. Bryant Rogers

82. Invented IMPATT diode in 1964.a. Douglas Engelbartb. Johnson and deLoacnc. Kao and Hockhamd. Bryant Rogers

83. Invented TRAPATT diode in 1967.a. Douglas Engelbartb. Johnson and deLoachc. Kao and Hockhamd. Prager, Chang and Weisbrod

84. Invented BARITT diode in 1968.a. G T Wrightb. Johnson and deLoach

c. Kao and Hockhamd. Prager, Chang and Weisbrod

85. Invented IC in 1958.a. G T Wrightb. Johnson and deLoachc. Jack Kilbyd. Prager, Chang and Wesibrod

86. Invented the IC aluminum metallization in 1968.a. G T Wrightb. Robert Noycec. Jack Kilby

d. Prager, Chang and Weisbrod

87. Invented the internet in 1969.a. G T Wrightb. Robert Noycec. Jack Kilbyd. ARPANET

88. Invented the UNIX operating system in 1970.a. Bell Labs, University of Californiab. Robert Noycec. Jack Kilbyd. ARPANET

89. Invented the CCD in 1970.a. Bell Labs, University of California

b. Robert Noycec. W S Boyle and G E Smithd. ARPANET

90. Invented the video games in 1972.a. Bell Labs, University of Californiab. Magnavoxc. W S Boyle and G E Smithd. ARPANET

91. Invented the I2L integrated circuit in 1972.

a. Bell Labs, University of Californiab. Magnavoxc. W S Boyle and G E Smithd. Hart and Slob

92. Invented CATT in 1974.a. Yu, Cady and Tantrapornb. Magnavoxc. W S Boyle and G E Smithd. Hart and Slob

93. Meters with moving coil are normally used formeasuring _________.a. dc onlyb. ac onlyc. both ac and dcd. % of value of dc

94. Another name of PMMC instrument.

a. ferromagneticb. electrodynamometerc. D Arsonvald. iron vane

95. Find the voltage drop developed across DAarsonval meter movement having an internalresistance of 1 k ohm and full deflection currentof 150 micro amp.a. 150 micro Vb. 150 kVc. 150 Vd. 150 mV

96. It consists of a permanent magnet, moving coil,and spring and the deflection of the pointerdepends upon the interaction of the magneticfields of the current carrying coil and permanentmagnet.a. ferromagneticb. electrodynamometerc. D Arsonvald. iron vane

97. What is the common type of meter movement?A. Fixed coil

b. Digitalc. Faradd. D Arsonval


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98. With no added gadget, D Arsonval meter can beused to measure.

a. ACb. AC and DCc. DCd. dynamic resistance

99. An instrument used to measure the voltagegenerated by human body parts in relation to theaction of the human heart.

a. ECGb. EEGc. ESC

d. ETX

100. How many decibels gain does an amplifier if itproduces 40-W output with an input of 0.016 W?

a. 3.398 dBb. 33.9 dBc. 67.959 dBd. 33.9 dB


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Answer:1. B

Solution: The meter must handle 1% of the desiredfull-scale reading.

0.0005 + 0.0495 = 0.05AE= IR = (1mA) (50) = 0.05V

For a full-scale reading of 0.05A, The shuntresistance will have to carry a current of 0.0495 A.

RSH = 0.05 / 0.0495 = 1.01 or

50 x 1/100 = 0.5 meter must handle50 x 99/100 = 49.5 shunt must handle50 = 1.01

49.5

2. D3. A

4. D5. B6. A7. A Sensitivity = 1/2mA = 500 /V8. B9. D10. A RT = 3V / 50 A = 60 k11. B12. D13. B14. B15. A pulse width16. C the ratio of resistors on one side of

the bridge equals the ratio of resistors on the otherside

17. C Damping torque18. A Deflecting force19. B Controlling force20. C Electrostatic21. A Conductor and non-magnetic

material22. B pulse delay23. C peak to peak24. D Fuse25. A has infinite high resistance26. B decreases27. B base, collector and emitter28. C Voltage regulators29. C base30. B very low resistance

31. B no current flows from emitter to collector32. D A negative resistance region33. B34. A35. D36. C37. B38. A39. B40. C41. D42. D43. A44. B45. B46. C47. B

48. A49. C50. A51. B52. A53. C54. B55. B56. D57. D58. C59. A60. B61. D62. C63. D64. C

65. B66. C capacitive67. D increasing the input frequency, decreases the

power dissipation68. C SiO269. C polysilicon70. A nand gate71. B nor gate72. D binary 073. C lower propagation delay74. C MESFET75. A EPROM76. B database77. A source program78. C object program

79. A assembler80. A Douglas Engelbart81. C Kao and Hockham82. B Johnson and deLoach83. D Prager, Chang and Weisbrod84. A G T Wright85. C Jack Kilby86. B Robert Noyce87. D ARPANET88. A Bell Labs, University of California89. C W S Boyle and G E Smith90. B Magnavox91. D Hart and Slob92. A Yu, Cady and Tantraporn93. A dc only

94. C D Arsonval95. D 150 mV96. C D Arsonval97. D D Arsonval98. C DC99. A ECG100. B 33.9 dB

Mock Board Examination in Electronics d

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