# Electronics Engineering Mastery Test 2: ECE Pre-Board

(Last Updated On: April 4, 2021) This is 100 items Practice Examinations set 2 in Electronics Engineering composed of previous 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 2

Choose the letter of the best answer in each questions.

1. ECE Board Exam March 1996

What is a group of circuits that provides timing and signals to all operation in the computer?

A. Output unit

B. Memory unit

C. Control unit

D. Input unit

Solution:

2. ECE Board Exam March 1996

Where does voltage generated in a DC generator depend?

A. Field resistance and flux

B. Field and armature currents

C. Flux and speed

D. Speed and field resistance

Solution:

3. ECE Board Exam March 1996

__________ is the most influential factor in the switching speed of saturated bipolar transistor

A. Charge stored

B. Collector current

C. HFE

D. Base current

Solution:

4. ECE Board Exam March 1996

What is a pi-network?

A. A Power Incidence Network

B. A network consisting of one inductor and two capacitors or two inductors and one capacitor

C. A network consisting entirely of four inductors or four capacitors

D. An antenna matching network that is isolated form ground

Solution:

5. ECE Board Exam March 1996

__________ is the property of a material which opposes creation of magnetic flux?

A. Resistance

B. Permeance

C. Reluctance

D. Conductance

Solution:

6. ECE Board Exam March 1996

The purpose of cells connected in parallel is to

A. increase internal resistance

B. increase voltage output

C. decrease current capacity

D. increase current capacity

Solution:

7. ECE Board Exam March 1996

What does SI magnetic flux refer?

A. Weber

B. Flux

C. Maxwell

D. Lines

Solution:

8. ECE Board Exam March 1996

__________ is a type of linear regulator used in applications requiring efficient utilization of the primary power source.

A. A series regulator

B. A shunt regulator

C. A constant current source

D. A shunt current source

Solution:

9. ECE Board Exam March 1996

When a switch is closed, it has a total resistance of

A. 1000 ohms at room temperature

B. unstable

C. infinity

D. zero

Solution:

10. ECE Board Exam March 1996

How many turns are needed to produce a magnetizing force of 5000 A.t. for a coil of 50 amperes?

A. 1,000 turns

B. 5,000 turns

C. 100 turns

D. 500 turns

Solution:

11. ECE Board Exam March 1996

When an SCR is triggered or on condition, its electrical characteristics are similar to what other solid-state device (as measured between its cathode and anode)?

A. The junction diode

B. The varactor diode

C. The tunnel diode

D. The hot-carrier diode

Solution:

12. ECE Board Exam March 1996

What special type of diode is capable of both amplification and oscillation?

A. Point contact diode

B. Junction diode

C. Zener diode

D. Tunnel diode

Solution:

13. ECE Board Exam March 1996

A static memory generally contains

A. electrons

B. positive ions

C. row decoders

D. holes

Solution:

14. ECE Board Exam March 1996

Which is the majority carrier in an N-type semiconductor?

A. Electrons

B. Positive ions

C. Negative ions

D. Holes

Solution:

15. ECE Board Exam March 1996

Steel is hard to magnetize because of its _______.

A. high retentivity

B. low permeability

C. high permeability

D. high density

Solution:

16. ECE Board Exam March 1996

When you increase the resistance in a circuit, the flows of electrons will ______

A. flow faster

B. be constant

C. be decreased

D. be stopped

Solution:

17. ECE Board Exam March 1996

Current in a chemical cell refers to the movement of ________

A. negative ions only

B. negative and positive ions

C. positive ions only

D. negative hole charge

Solution:

18. ECE Board Exam March 1996

What is the effect of light in a photodiode?

A. Reverse current

B. Limits flow of current

C. Forwards current

D. Renders unstable current

Solution:

19. ECE Board Exam March 1996

What is the effect in terms of bandwidth when the Q of a single-tune stage is doubled?

A. Doubled

B. The same

C. Halved

D. Four times

Solution:

20. ECE Board Exam March 1996

___________ is the dc motor control senses.

A. Resistance

B. Counter emf

C. Field voltage

D. Armature current

Solution:

21. ECE Board Exam March 1996

What is the range of voltage rating available in zener diodes?

A. 2.4 volts to 200 volts

B. 1.2 volts to 7 volts

C. 3 volts to 2000 volts

D. 1.2 volts to 5.6 volts

Solution:

22. ECE Board Exam March 1996

Find which type of network provides the greatest harmonic suppression.

A. Pi-network

B. Pi-L-network

C. Inverse-Pi-network

D. L-network

Solution:

23. ECE Board Exam March 1996

What type of transformer that is used to protect technicians and operators from deadly electrical shock?

A. Absorber transformer

B. Step-down transformer

C. Step-up transformer

D. Isolation transformer

Solution:

24. ECE Board Exam March 1996

What is residual magnetism?

A. The external magnetic field when the current is flowing through the exciting coil.

B. The flux density, which exist in the iron core when the magnetic field intensity is reduced to zero.

C. The flux density, which exist in the iron core when the magnetic field intensity is at its maximum value.

D. The flux density when the magnetic core is saturated.

Solution:

25. ECE Board Exam March 1996

When batteries have cells connected in series the effect is

A. reduced output voltage

B. increased current supply

C. increased voltage supply

D. reduced internal resistance

Solution:

26. ECE Board Exam March 1996

How many OP-AMPS does window comparator require?

A. 2

B. 4

C. 3

D. 1

Solution:

27. ECE Board Exam March 1996

What is the memory element used in clocked sequential logic circuit?

A. Gates

B. Flip-flop

C. Static-RAM

Solution:

28. ECE Board Exam March 1996

Semiconductors which are considered to be “low power” or “small signal” usually have power dissipation ratings of

A. 1 watt or less

B. 5 watts or less

C. exactly 1 watt

D. 10 watt or less

Solution:

29. ECE Board Exam March 1996

________ for a transistor to be cut-off

A. Maximum current flows from emitter to collector

B. The transistor is at its operating point

C. No current flows from emitter to collector

D. There is no base current

Solution:

30. ECE Board Exam March 1996

A __________ is an instruction in a source language that is to be replaced by a defined sequence of instructions in the same source language

A. statement

B. source code

C. mnemonic

D. macro-instruction

Solution:

31. ECE Board Exam March 1996

Common-base (CB) amplifier has ______ compared to common-emitter and common collector amplifiers.

A. a higher input resistance

B. a larger current gain

C. a lower input resistance

D. a larger voltage gain

Solution:

32. ECE Board Exam March 1996

_________ currents are wasteful currents which flow in cores of transformers and produces heat.

A. Residual

B. Eddy

C. Sneak

D. Magnetizing

Solution:

33. ECE Board Exam March 1996

Which of the following photocell is most sensitive to?

B. Sound waves

C. Light waves

D. Heat waves

Solution:

34. ECE Board Exam March 1996

What is the resonant frequency of a circuit when L of 1 microhenry and C of 10 picofarads are in series?

A. 15.9 MHz

B. 50.3 MHz

C. 15.9 MHz

D. 50.3 kHz

Solution:

35. ECE Board Exam March 1996

What is the law that determines polarity of an induced voltage?

A. Norton’s Law

B. Thevenin’s Law

C. Lenz Law

Solution:

36. ECE Board Exam March 1996

The science of physical phenomena at very low temperatures, approaching absolute zero is called ____________

A. Crytanalysis

B. Cybernetics

C. Temperature inversion

D. Cryogenics

Solution:

37. ECE Board Exam March 1996

If a dry cell has an internal resistance of 0.50 ohm and an emf of 2 volts, find power delivered in a one ohm resistor?

A. 1.33 watts

B. 1.66 watts

C. 3.66 watts

D. 1.77 watts

Solution:

38. ECE Board Exam March 1996

What happens in the resistance of copper wired when its temperature is raised?

A. Decreased

C. Increase

D. Zero

Solution:

39. ECE Board Exam March 1996

Refers to the part of computer that performs mathematical operations

A. CPU

B. Flip-flop

C. Assembly Language

D. ALU

Solution:

40. ECE Board Exam March 1996

________ is called a memory device which holds fixed set of data in a circuit.

A. RAM

B. Register

C. Logic

D. ROM

Solution:

41. ECE Board Exam March 1996

When a voltage of 100 V at 50 Hz is applied to a choking coil A, the current taken is 8A and the power is 120 W, when applied to a coil B, the current is 10 A and the power is 120 W. What power will be taken when 100 V is applied to the two coils connected in series?

A. 4737 W

B. 140 W

C. 70 W

D. 1454 W

Solution:

42. ECE Board Exam March 1996

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

A. 5.455 A

B. 66,000 A

C. 18,200 A

D. 182 A

Solution:

43. ECE Board Exam March 1996

A. Propagation delay

B. Pulse duration

C. Settling time

D. Access time

Solution:

44. ECE Board Exam March 1996

When a logic circuit rejects an unwanted signal, this is termed as ________

A. logic levels

B. noise margin

C. power consumption

D. propagation delay

Solution:

45. ECE Board Exam March 1996

What 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:

46. ECE Board Exam March 1996

How many symbols do hexadecimal digital number system used?

A. 16

B. 4

C. 8

D. 32

Solution:

47. ECE Board Exam March 1996

What is the equivalent of decimal 47 in binary?

A. 111011

B. 111101

C. 110111

D. 101111

Solution:

48. ECE Board Exam March 1996

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 output only when all inputs are low?

A. AND gate

B. OR gate

C. NOR gate

D. NAND gate

Solution:

49. ECE Board Exam March 1996

Determine which is not a dynamic test instrument

A. Oscilloscope

B. Logic monitor

C. Logic

D. Logic

Solution:

50. ECE Board Exam March 1996

How much voltage regulation does commercial power supply have?

A. 10% and above

B. Within 1%

C. 15% and above

D. 10%

Solution:

51. ECE Board Exam March 1996

________ is called an electronic transfer from one stage to the next.

A. Coupling

B. Swamping

C. Doping

D. Mixing

Solution:

52. ECE Board Exam March 1996

_______ capability is analogous to permeance.

B. Conductance

C. Reluctance

D. Resistance

Solution:

53. ECE Board Exam March 1996

Which is a common use for point-contact diode?

A. As a constant current source

B. As a constant voltage source

C. As an RF detector

D. As a high voltage rectifier

Solution:

54. ECE Board Exam March 1996

Which of the following is not a secondary type cell?

A. Lithium

D. Silver-zinc

Solution:

55. ECE Board Exam March 1996

What do you call the piece of equipment in an oscilloscope used to indicate pulse condition in a digital logic circuit?

A. Logic probe

B. Probe

C. Electroscope

D. Galvanometer

Solution:

56. ECE Board Exam March 1996

How many bits, binary pattern represent the decimal numbers 0 to 9 in binary coded decimal?

A. 4

B. 1

C. 2

D. 8

Solution:

57. ECE Board Exam March 1996

Which is the principal characteristic of a varactor diode?

A. It has a very high PIV

B. It has a negative resistance region

C. Its internal capacitance varies with the applied voltage

D. It has a constant voltage under conditions of varying current

Solution:

58. ECE Board Exam March 1996

What is the law whereby the attraction or repulsion between two magnetic poles is directly proportional to their strength?

A. Coulomb’s law

B. Newton’s law

C. Coulomb’s first law

D. Norton’s law

Solution:

59. ECE Board Exam March 1996

Efficient oscillators are those that are class ________.

A. AB

B. B

C. C

D. A

Solution:

60. ECE Board Exam March 1996

_______ refers to a circuit that stores pulses and produces an output pulse when specified number of pulses is stored.

A. Counter

B. Register

C. Flip-flop

D. Buffer

Solution:

61. ECE Board Exam March 1996

How many lithium cells in series are needed for a 12 V battery?

A. 12 cells

B. 4 cells

C. 8 cells

D. 10 cells

Solution:

62. ECE Board Exam March 1996

_________ is a linear electronic voltage regulator

A. A regulator that has a ramp voltage at its output

B. A regulator in which the control device is switched on or off, with the duty cycle proportional to the line or load conditions

C. A regulator in which the pass transistor switches from the “off” state to the “on” state

D. A regulator in which the conduction of a control element is varied in direct proportion to the voltage or load current.

Solution:

63. ECE Board Exam March 1996

The particles that make up the lattice in ionic crystal

A. Molecules

B. Ions

C. Electrons

D. Neutron

Solution:

64. ECE Board Exam March 1996

Parallel cells have the same voltage as one cell but have _______.

A. unstable resistance

B. less current capacity

C. fluctuating power output

D. more current capacity

Solution:

65. ECE Board Exam March 1996

A digital word consisting of only four bits is called a

A. dibit

C. pixel

D. nibble

Solution:

66. ECE Board Exam March 1996

The reason for the thin layer of varnish over the copper coil pattern is to prevent

A. oxidizing

B. flux

C. corrosion

D. dioxide

Solution:

67. ECE Board Exam March 1996

_________ is the output voltage of a carbon-zinc cell.

A. 3.5 V

B. 2.5 V

C. 1.5 V

D. 0.5 V

Solution:

68. ECE Board Exam March 1996

Speed of a logic circuit is normally expressed as ________

A. logic levels

B. speed immunity

C. propagation delay

D. power consumption

Solution:

69. ECE Board Exam March 1996

_______ is the term used to express the ratio of the change in the dc collector current to a change in base current in a bipolar transistor.

A. Gamma

B. Beta

C. Alpha

D. Delta

Solution:

70. ECE Board Exam March 1996

_______ refers to a program that translates and then immediately executes statements in a high level language.

A. Interpreter

B. Synchronous

C. Interface

D. Operating system

Solution:

71. ECE Board Exam March 1996

__________ is the property of magnetic materials which retain magnetism after magnetizing force is withdrawn.

A. Reluctivity

B. Resistivity

C. Retentivity

D. Conductivity

Solution:

72. ECE Board Exam March 1996

A ________ is a junction field effect transistor with a Schottky barrier instead of a normal semiconductor junction.

A. biFET

B. MOSFET

C. MESFET

D. JUGFET

Solution:

73. ECE Board Exam March 1996

Term used for response in an electrical circuit.

A. The frequency at which power factor is at a minimum

B. The highest frequency that will pass current

C. The frequency at which capacitive reactance equals inductive reactance

D. The lowest frequency that will pass current

Solution:

74. ECE Board Exam March 1996

_________ is the progressive decay with time in the amplitude of the free oscillation in a circuit.

A. Decrement

B. Pulse decay time

C. Damping

D. Dancing

Solution:

75. ECE Board Exam March 1996

What do you call a circuit that changes pure binary code into ASCII?

A. Decoder

B. Encoder

C. Demultiplexer

D. Code converter

Solution:

76. ECE Board Exam March 1996

Which of the following statement is incorrect?

A. Open transistor has three (3) terminals

B. Transistors have three (3) terminals

C. Potentiometer has three (3) terminals

D. Typical power rating of carbon-composition resistors ranged from 0.001 W to 0.1 W

Solution:

77. ECE Board Exam March 1996

Which statement is not true?

A. The internal resistance of a cell limits the amount of output current

B. Two electrodes of the same metal provide the highest voltage output

C. Secondary cell can be recharged

D. The negative terminal of a chemical cell has a charge of excess electrons

Solution:

78. ECE Board Exam March 1996

What type of circuit whose parameters are constant which do not change with voltage of current?

A. Lumped circuit

B. Tuned circuit

C. Reactive circuit

D. Linear circuit

Solution:

79. ECE Board Exam March 1996

__________ is gaseous tube which uses a pool of liquid mercury as its cathode.

A. Thyratron

B. Phanotron

C. Klystron

D. Ignition

Solution:

80. ECE Board Exam March 1996

What do you call an electromagnet with its core in a form of magnetic ring?

A. Polarization

C. Toroid

D. Doping

Solution:

81. ECE Board Exam March 1996

_________ is the procedure by which an atom is given a net charge by adding or taking away of electron.

A. Polarization

C. Ionization

D. Doping

Solution:

82. ECE Board Exam March 1996

What do you call an electronic component that is a non-linear resistor and its resistance is function of the voltage across it?

A. Triac

B. IC

C. Varistor

D. Thyristor

Solution:

83. ECE Board Exam March 1996

Find the half-power bandwidth of a resonant circuit which has a resonant frequency of 1.8 MHz and a Q of 95.

A. 189 Hz

B. 1.89 kHz

C. 58.7 kHz

D. 18.9 kHz

Solution:

84. ECE Board Exam March 1996

A dynamic memory will store information

A. as long as power is applied to the memory

B. as long as power is applied and the memory is refreshed periodically

C. even when power is not applied to the memory

D. when power is applied at regular intervals

Solution:

85. ECE Board Exam March 1996

The energy of an oscillator can be source by _________

A. coupling a small coil close to the tube

B. capacitance of inductive coupling from tuned circuit

C. inserting resistor in the grid circuit

D. connecting capacitor across the supply

Solution:

86. ECE Board Exam March 1996

Refers to that part of computer that interprets and executes instructions

A. ACC

B. ALU

C. CPU

D. Compiler

Solution:

87. ECE Board Exam March 1996

What is the gain of a vacuum tube having the following parameter amplification factor is 80, external plate-load resistance of 30,000 ohms and the tubes internal plate resistance is 10,000 ohms?

A. 60

B. 20

C. 30

D. 40

Solution:

88. ECE Board Exam March 1996

__________is the region in a transistor that is heavily doped

A. Collector

B. Ground

C. Base

D. Emitter

Solution:

89. ECE Board Exam March 1996

Which class of amplifier has the highest linearity and least distortion

A. Class A

B. Class AB

C. Class C

D. Class B

Solution:

90. ECE Board Exam March 1996

_________ is the unit of reluctance.

A. Gauss

B. Weber

C. Maxwells

D. At/Wb

Solution:

91. ECE Board Exam March 1996

Find the value of voltage regulation having a dc voltage of 67 V without load and with full load current drawn the output voltage drops to 42 V.

A. 59.5 %

B. 15.9 %

C. 62.6 %

D. 32.5 %

Solution:

92. ECE Board Exam March 1996

What is the reason why more cells can be stored in a given area with dynamic cells?

A. They consume less power

B. They are smaller

C. They are larger

D. They travel faster

Solution:

93. ECE Board Exam March 1996

Which of the following is a characteristic of cascaded amplifier?

A. Double each amplifier’s gain

B. Each amplifiers gain is increased

C. Increased overall gain

D. Total gain is decreased

Solution:

94. ECE Board Exam March 1996

How do you determine if diode is defective?

A. Diode resistance is either very low or very high on either direction

B. High current

C. Very low current

D. High voltage

Solution:

95. ECE Board Exam March 1996

Avalanche breakdown is primarily dependent on the phenomenon of

A. doping

B. collision

C. recombination

D. ionization

Solution:

96. ECE Board Exam March 1996

What network facility is used to interconnect distinct networks physically?

A. Relays

B. Routers

C. Repeaters

D. Bridges

Solution:

97. ECE Board Exam March 1996

Diagram showing procedures which are followed and actions taken is called

A. functional block diagram

B. circuit diagram

C. flow chart

D. schematic diagram

Solution:

98. ECE Board Exam March 1996

Find the dielectric constant of air

A. Approximately 1

B. Approximately 0

C. Approximately 2

D. Approximately 4

Solution:

99. ECE Board Exam March 1996

__________ refers to the term remote sensing with regard to a linear voltage regulator.

A. The feedback connection to the error amplifier is made directly to the load

C. The error amplifier compares the input voltage to the reference voltage

D. Sensing is accomplished by wireless inductive loops

Solution:

100. ECE Board Exam March 1996

Transition region refers to ________ with regard to transistor.

A. the area of maximum N-type charge

B. the area maximum P-type

C. the point where wire leads are connected to the P or N type material

D. an area of low charge density around P-N junction

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

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