# Electronics Engineering Mastery Test 15: ECE Pre-Board

(Last Updated On: April 4, 2021) This is 100 items set of Practice Examination 15 in Electronics Engineering composed of previous and/or potential Board Exams Questions. Read each questions and choices carefully! Choose the best answer. In the actual board, you have to answer 100 items in Electronics Engineering within 4 hours. You have to get at least 70% to pass the subject. Electronics Engineering is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Systems and Technology (30%).

#### Start the Test Yourself Exam 15

Choose the letter of the best answer in each questions.

1.  Semiconductor memory matrix storing digital data.

a.  ROM

b.  EPROM

c.  EEPROM

d.  RAM

Solution:

2.  The rate at which computer processes information.

a.  Baud rate

b.  Throughput

c.  Bandwidth

d.  Processing speed

Solution:

3.  Uses laser to change spin of electrons.

a.  Plate

b.  Laser gun

c.  Quantum coupler

d.  Cathode ray tube

Solution:

4.  Uses laser instead of electric current

a.  Optical mouse

b.  Optical fiber

c.  Optical storage

d.  Optical computer

Solution:

5.  Mechanism for read/write on disk.

a.  Access arm

b.  Spinner

d.  Step motor

Solution:

6.  Time to spin within a particular disk sector.

a.  Spin time

b.  Latency time

c.  Period

d.  Spin second

Solution:

7.  Format used for commercial tape recording.

a.  18-track format

b.  12-track format

c.  9-track format

d.  6-track format

Solution:

8.  Forces between atomic moments.

a.  Momentum

b.  Magnetism

c.  Ferromagnetism

d.  Attraction

Solution:

9.  Instrument for measuring oxygenation of blood via the earlobe.

a.  Blood oxymeter

b.  Oxymeter

c.  Oxygen meter

d.  Blood meter

Solution:

10. Coined “robotics” in his novel Runaround, 1942

a.  Karl Capek

b.  George Devol

c.  Joseph Engelberger

d.  Isaac Asimov

Solution:

11. A robot arm is a/an _____.

a.  Manipulator

b.  End effector

c.  Actuator

Solution:

12. A robot hand is a/an _____.

a.  Manipulator

b.  End effector

c.  Actuator

Solution:

13. The terminal voltage first increases then decreases.

a.  Series-wound motor at constant speed

b.  Series-wound generator at constant speed

c.  Parallel-wound motor at constant speed

d.  Parallel-wound generator at constant speed

Solution:

14. Uses multiple saturable-core reactors; low fidelity, time lag, not for high frequencies

a.  Class A amplifier

b.  Class C amplifier

c.  Magnetic amplifier

d.  Class B amplifier

Solution:

15. This results when the counter-torque of a synchronous motor is exceeded.

a.  Stalling

b.  Reverse motion

c.  Forward motion

d.  Overspeeding

Solution:

16. This varies armature resistance, flux/pole, and voltage.

a.  Armature current

b.  Controlling voltage of a DC motor

c.  Armature voltage

d.  Controlling current of an AC motor

Solution:

17. Motor starter with variable speed control.

a.  Brush

b.  Controller

c.  Starting resistor

d.  None of these

Solution:

18. The magnitude of angular momentum vector

a.  Azimuthal quantum number

b.  Angular velocity

c.  Momentary angle

d.  None of these

Solution:

19. This moves while paper/page is fed into the printer.

a.  From feed

b.  Feed form

c.  Feeder

d.  Stepper motor

Solution:

20. A type of device that writes on screen

a.  Pointing device

b.  Screen pen

c.  Light pen

d.  None of these

Solution:

21. A signal that external device wants to send data to computer

a.  Handshake

b.  Token

c.  Interrupt

d.  None of these

Solution:

22. Permanent ROM programming

a.  Firmware

b.  Software

c.  Hardware

d.  Tupperware

Solution:

23. Contains BIOS memory

a.  XPOS memory

b.  WIN memory

c.  RAM

d.  OS memory

Solution:

24. Treatment with electric current.

a.  Current therapy

b.  Voltage therapy

c.  Electrotherapy

d.  Pantotherapy

Solution:

25. Cell used as reference cell in large laboratories.

a.  Laboratory cell

b.  Weston saturated cell

c.  Bridge cell

d.  House cell

Solution:

26. Also known as throw-away factor

a.  Lay-down factor

b.  Waste factor

c.  Sacrifice factor

d.  None of these

Solution:

27. Double charge; easily stopped wave

a.  Alpha

b.  Beta

c.  Gamma

d.  X-ray

Solution:

28. No change; no ionization; biological damage

a.  Alpha

b.  Beta

c.  Gamma

d.  X-ray

Solution:

29. Selenium Material used for photovoltaic cells

a.  Silicon

b.  Wafer

c.  Selenium

d.  Gallium arsenide

Solution:

30. In volt meter the purpose of series resistor is to _________.

a.  increase speed of meter movement

b.  decrease the current range

c.  decrease the voltage range

d.  increase the voltage range

Solution:

31. What sensor provides a dc voltage approximately 1 V at 10 mW?

a.  Diode sensor

b.  Thermocouple sensor

c.  Thermal sensor

d.  Thermistor sensor

Solution:

32. An oscilloscope provides easy measurement of ________ values.

a.  Instantaneous

b.  Rms

c.  peak to peak

d.  average

Solution:

33. An element in electronics which serves as a protection against overload?

a.  Resistor

b.  Transistor

c.  Semiconductor

d.  Fuse

Solution:

34. Two pn silicon diodes are connected in series opposing. A 5 V voltage is impressed upon them. Find the voltage across each junction at room temperature when nVT = 0.052 V.

a.  0.236 V , 3.2 V

b.  4.764 V , 0.236 V

c.  0.036 V , 4.964 V

d.  3.21 V , 1.79 V

Solution:

35. When a factor of a junction transistor is 0.98, the factor would be equivalent to ________ value of transistor’s beta.

a.  49

b.  60

c.  20

d.  38

Solution:

36. A manufacturer quotes in his specifications that a germanium diode conducts 50 mA at 1 volt. Determine its bulk resistance

a.  100 ohms

b.  60 ohms

c.  14 ohms

d.  20 ohms

Solution:

37. In semiconductor technology, the characteristic of a transistor in cut-off refers to a condition when _________.

a.  the transistor is at its operating point

b.  no current flows from emitter to collector

c.  there is no base current

d.  maximum current flows from emitter to collector

Solution:

38. Which is the principal characteristic of a tunnel diode?

a.  A very high PIV

b.  A high forward current rating

c.  A high forward resistance

d.  A negative resistance region

Solution:

39. A computer language constructed of ones and zeros using binary codes that were stored in the computer memory system as groups of instructions called programs.

a.  assembler language

b.  assembly language

c.  machine language

d.  FORTRAN language

Solution:

40. Probably the easiest programming language to learn

a.  FORTRAN

b.  ALGOL

c.  BASIC

d.  COBOL

Solution:

41. Written and developed by Bill Gates for the Altair 8800 computer.

a.  Basic Language Interpreter

b.  PASCAL

c.  CISC

d.  MS DOS

Solution:

42. If memory is addressed, the address bus contains a memory address, which does not vary in width with the different versions of microprocessors.

a.  True

b.  False

c.  Cannot be determined

d.  None of these

Solution:

a.  True

b.  False

c.  Cannot be determined

d.  None of these

Solution:

44. The first truly successful and widespread programming language for business applications.

a.  DBASE III+

b.  COBOL

c.  FOXPRO

d.  RPG

Solution:

45. Transfers information between the microprocessor and its memory and I/O address space.

b.  Data bus

c.  Control bus

d.  USB

Solution:

46. 1 kilo byte refers to __________.

a.  1000 bits

b.  976 bits

c.  1024 bits

d.  1000 bytes

Solution:

47. A 4-bit wide memory location

a.  Byte

b.  nibble

c.  bit

d.  word

Solution:

48. Generally an 8-bit wide binary number

a.  Byte

b.  nibble

c.  bit

Solution:

49. A  program  that  converts  an instruction  written  in  a  high-level language into machine code.

a.  Assembler

b.  Interpreter

c.  Compiler

d.  Translator

Solution:

50. How  many  pins  that  a  555  timer has?

a.  6

b.  10

c.  8

d.  12

Solution:

51. Pin 1 of 555 timer.

a.  ground

b.  output

c.  trigger

d.  reset

Solution:

52. Pin 2 of 555 timer.

a.  Ground

b.  Output

c.  Trigger

d.  Reset

Solution:

53. Pin 3 of 555 timer.

a.  Ground

b.  Output

c.  Trigger

d.  Reset

Solution:

54. Pin 4 of 555 timer.

a.  Ground

b.  Output

c.  Trigger

d.  Reset

Solution:

55. Invented bar codes in 1974.

b.  Magnavox

c.  Ad Hoc Committee of Grocery Industry

d.  Hart and Slob

Solution:

56. Invented the VHS recorder in 1975.

b.  JVC

c.  Ad Hoc Committee of Grocery Industry

d.  IBM

Solution:

57. Invented laser printer in 1975.

b.  JVC

c.  Ad Hoc Committee of Grocery Industry

d.  IBM

Solution:

58. Invented Betamax Video Recorder in 1975.

a.  Sony

b.  JVC

c.  Ad Hoc Committee of Grocery Industry

d.  IBM

Solution:

59. Invented pocket TV receiver in 1977.

a.  Sony

b.  JVC

d.  IBM

Solution:

60. Invented compact disc laser optical recording.

a.  Sony

b.  Philips

d.  IBM

Solution:

61. Invented fiber optics submarine cable in 1981.

a.  Sony

b.  Philips

d.  Standard Telephoned and Cables.

Solution:

62. Type  of  power-line  frequency  meter composed  of  vibrating  iron  reeds placed in alternating magnetic field.

a.  Induction type

b.  Electrodynamic type

c.  Resonant type

d.  Vibrating reed type

Solution:

63. Type of power line frequency meter device  utilizing  a  principle  of balancing  and  indicator  needle  at center  of  a  scale  using  magnetic fields  (resistive  and  inductive) opposing each other.

a.  magnetic type

b.  resistive type

c.  resonant type

d.  electrodynamic type

Solution:

64. It  is  composed  of  a  moving  coil which is free to rotate in reaction the magnetic field generated by passing current  through  2  stationary  field coils.

a.  Ferromagnetic

b.  Electrodynamometer

c.  D’ Arsonval

d.  iron vane

Solution:

65. Electrodynamometer can be used to measure

a.  AC

b.  AC and DC

c.  DC

d.  dynamic resistance

Solution:

66. An  electrodynamic  meter  used  to measure power

a.  hook-on type voltmeter

b.  multi-meter

c.  wattmeter

d.  watt-hour meter

Solution:

67. How do  you measure the current in a circuit without an ammeter?

a.  By  computing  the  values  of resistance

b.  Divide  total  circuit  resistance  by the total circuit load

c.  Measure the voltage drop across the tube

d.  Measure  the  voltage  across known resistor

Solution:

68. The  ideal  internal  resistance  of  an ammeter should be

a.  equal to the circuit’s resistance

b.  higher than the circuit resistance

c.  zero

d.  infinity

Solution:

69. Determine  the  percentage  error  of reading  of  an  ammeter  due  to ammeter  insertion.  Ammeter parameters include 70 ohms internal resistance and a load resistor of 1.4 kilo ohms.

a.  2.0

b.  7.5

c.  3.76

d.  4.76

Solution:

70. The output transformer used in a power amplifier is a transformer.

a)  1:1 ratio

b)  Step-down

c)  Step-up

d)  Auto

Solution:

71. A memory device which holds a fixed set of data in a circuit is called _______.

a.  RAM

b.  ROM

c.  Buffer

d.  Register

Solution:

72. Transformer coupling can be used in amplifiers.

a)  Only power

b)  Only voltage

c)  Either power or voltage

d)  Only current

Solution:

73. When a voltage of 100 volts at 50 Hertz is applied to a choking coil A, the current is 8 amperes and the power is 120 watts. When applied to a coil B, the current is 10 amperes and the power is 500 watts. What power will be taken when 100 volts is applied to the two coils connected in series.

a)  4727 watts

b)  70 watts

c)  140 watts

d)  1454 watts

Solution:

74. The most important consideration in power amplifiers is

a)  Collector Efficiency

b)  Biasing the circuit

c)  To keep the transformer cool

d)  Amplifier Distortion

Solution:

75. The current needed to operate a soldering iron which has a rating of 600 watts at 110 volts is

a)  5.455 amperes

b)  66 amperes

c)  18.2 amperes

d)  0.182 ampere

Solution:

76.  An AF transformer is shielded to

a)  Keep the amplifier cool

b)  Prevent induction due to stray magnetic fields

c)  Protect from rusting

d)  To maintain secrecy

Solution:

77.  An interval required to address and read out memory word is called

a)  Propagation Delay

b)  Setting Time

c)  Transit Time

d)  Access Time

Solution:

78. Amplitude distortion is also called ____ distortion.

a)  Intermodulation

b)  Harmonic

c)  Phase

d)  Resonant

Solution:

79.  _____ is a term applied when a logic circuit rejects an unwanted signal.

a)  Logic Levels

b)  Noise Margin

c)  Power Consumption

d)  Propagation Delay

Solution:

80.  Transformer coupling introduces _____ distortion.

a)  Amplitude

b)  Intermodulation

c)  Frequency

d)  Jitter

Solution:

81. ______ is responsible for the phenomenon when voltages across reactances in series can often be larger than the voltage applied to them.

a)  Capacitance

b)  Resistance

c)  Conductance

d)  Resonance

Solution:

82.  A pulsating DC applied to power amplifiers causes ______.

a)  Burning of Transistors

b)  Hum in the Circuit

c)  Excessive Forward Voltage

d)  Both (a) and (c)

Solution:

83.  A hexadecimal digital number systems has______ symbols.

a)  16

b)  8

c)  2

d)  32

e)  60

Solution:

84. The disadvantage of impedance matching is that it _____.

a.  Gives Distorted Output

b.  Requires a Transformer

c.  Gives Low Power Output

d.  Both (b) and (c)

Solution:

85.  The binary equivalent of decimal number 47 is

a.  11011

b.  110111

c.  111101

d.  101111

Solution:

86. If the gain versus frequency curve of a transistor is not flat, then there is ______ distortion.

a)  Amplitude

b)  Frequency

c)  Intermodulation

d)  Both (a) and (c)

Solution:

87. What is the logic circuit having two or more inputs but only one output, with high output if any or all inputs are high, with low input only when all inputs are low?

a.  AND Gate

b.  OR Gate

c.  NOR Gate

d.  NAND Gate

Solution:

88.  The most costly method of coupling

a.  RC coupling

b.  Direct

c.  Transformer

d.  Impedance

Solution:

89.  Which of the following is NOT a dynamic test instrument?

a.  Oscilloscope

b.  Logic Monitor

c.  Logic Analyzer

d.  Logic Probe

Solution:

90.  The signal generator generally used in laboratories is _____ oscillator.

a.  Crystal

b.  Wien Bridge

c.  Hartley

d.  Phase Shift

Solution:

91. A commercial power supply has ____ voltage regulation.

a)  10% and above

b)  Within 1%

c)  15% and above

d)  10%

Solution:

92.  _____ is a fixed frequency oscillator.

a.  Phase Shift

b.  Colpitts

c.  Hartley

d.  Crystal

Solution:

93. An electronic transfer from one stage to the next is called _____.

a.  Coupling

b.  Swamping

c.  Doping

d.  Mixing

Solution:

94. An important limitation of crystal oscillator is

a)  Its low output

b)  Its high Q

c)  Less availability of quartz crystal

d)  Its high output

Solution:

95.  _____ is analogous to permeance.

b.  Elastance

c.  Conductance

d.  Resistance

Solution:

96.  For microwave frequencies, a _____ oscillator is required.

a.  Klystron

b.  Wien Bridge

c.  Hartley

d.  Colpitts

Solution:

97.  A point contact diode is commonly used

a)  As a constant current source

b)  As a constant voltage source

c)  As an RF detector

d)  As a high voltage rectifier

Solution:

98. In an LC oscillator, if the value of L is increased four times, then frequency of oscillation is

a)  Halved

b)  Decreased 4 times

c)  Doubled

Solution:

99.  Which of the following is NOT a secondary type cell?

a.  Lithium

d.   All of these

Solution:

100.  When shock-excited, a crystal will produce alternating EMF longer than an LC circuit because crystal

a. Has greater mechanical strength

b. Has lesser losses

c.  Is small-sized

d. Is lightweight

Solution:

### Complete List of Electronics Engineering Pre-Board Exams

Electronics Engineering Pre-Board Exams
Module 1: Electronics Engineering Exam 1                   Answer key: EXAM 1
Module 2: Electronics Engineering Exam 2                   Answer key: EXAM 2
Module 3: Electronics Engineering Exam 3                   Answer key: EXAM 3
Module 4: Electronics Engineering Exam 4                   Answer key: EXAM 4
Module 5: Electronics Engineering Exam 5                   Answer key: EXAM 5
Module 6: Electronics Engineering Exam 6                   Answer key: EXAM 6
Module 7: Electronics Engineering Exam 7                   Answer key: EXAM 7
Module 8: Electronics Engineering Exam 8                   Answer key: EXAM 8
Module 9: Electronics Engineering Exam 9                   Answer key: EXAM 9
Module 10: Electronics Engineering Exam 10                   Answer key: EXAM 10