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# Electronics Engineering Mastery Test 10: ECE Pre-Board

This is 100 items set of Practice Examination 10 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 10

Choose the letter of the best answer in each questions.

1. What probable effect on the human body if subjected to a current of 40 to 100 mA, 60 Hz, AC or 160 to 300 mA, DC?

A. Respiratory failure

B. Perception

C. Reflex action

D. Mascular inhibition

Solution:

2. What probable effect on the human body if subjected to a current of over 100 mA, 60 Hz, AC or 300 mA, DC?

A. Respiratory failure

B. Fatal

C. Reflex action

D. Mascular inhibition

Solution:

3. What refers to the jarring, shaking sensation you receive from contact with electricity?

A. Respiratory failure

B. Electric shock

C. Fatal

D. Mascular inhibition

Solution:

4. Mechanical rotation frequency is measured using a device called ______.

A. frequency counter

B. frequency meter

C. accelerometer

D. tachometer

Solution:

5. Electrical-output frequencies of ac generators can be measured by ______.

A. vibrating-reed devices or tuned circuits

B. accelerometer

C. frequency meter

D. tachometer

Solution:

6. Audio frequencies can be measured by a process known as ______.

A. frequency counting

B. zero beating

C. beating

D. mixing

Solution:

7. What is another term for zero beating?

A. Frequency counting

B. Heterodyning

C. Beating

D. Mixing

Solution:

8. What wavemeter is used for measuring frequencies in the microwave range?

A. Frequency counter

B. Bolometer

C. Cavity wavemeter.

D. Absorption wavemeter

Solution:

9. What is the process of matching an unknown signal with a locally generated signal of the same frequency obtained from a calibrated high-precision oscillator?

A. Frequency counting

B. Zero beating

C. Beating

D. Mixing

Solution:

10. What device that sweeps over a band of frequencies to determine what frequencies are being produced by a specific circuit under test and the amplitude of each frequency component?

A. Frequency counter

B. Bolometer

C. Cavity wavemeter

D. Spectrum analyzer

Solution:

11. What is commonly used for the analysis of waveforms generated by electronic equipment?

A. Frequency counter

B. Cavity wavemeter

C. Cathode-Ray Oscilloscope (CRO or O-SCOPE)

D. Bolometer

Solution:

12. What is device used to measure frequencies above the audio range?

A. Frequency counter

B. Cavity wavemeter

C. Bolometer

D. Electronic Frequency Counter

Solution:

13. What are calibrated resonant circuits used to measure frequency?

A. Frequency counter

B. Wavemeters

C. Cavity wavemeter

D. Spectrum analyzer

Solution:

14. What is the difference in frequency between the oscillator frequency and the unknown frequency?

A. Beat frequency

B. lF

C. Image frequency

D. Signal frequency

Solution:

15. The rotation frequency of recording devices and teletypewriter motors can be measured by the use of a ______.

A. Tachometer

B. Oscilloscope

C. Frequency counter

D. Stroboscope

Solution:

16. What is an instrument that allows you to view rotating or reciprocating objects intermittently and produces the optical effect of a slowing down or stopping motion?

A. Tachometer

B. Oscilloscope

C. Frequency counter

D. Stroboscope

Solution:

17. What is an electronic flash device in which the flash duration is very short, a few millionths of a second and can measure very rapid motion?

A. Tachometer

B. Strobotac

C. Frequency counter

D. Stroboscope

Solution:

18. What is a combination of watch and revolution counter?

A. Chronometric tachometer

B. Frequency counter

C. Strobotac

D. Stroboscope

Solution:

19. What type of bolometer is characterized by an increase in resistance as the dissipated power rises?

A. Chronometric tachometer

B. Strobotac

C. Barretter

D. Stroboscope

Solution:

20. What type of bolometer is characterized by decrease in resistance as the power increases?

A. Chronometrictachometer

B. Strobotac

C. Barretter

D. Thermistor

Solution:

21. What instrument is used for measuring radio frequency (rf) power?

A. Thermocouple ammeter

B. Strobotac

C. Barretter

D. Thermistor

Solution:

22. When using strobotac, at what speed is “flicker” becomes a problem because the human eye can retain successive images long enough to create the illusion of continuous motion?

A. 600 rpm

B. 500 rpm

C. 1200 rpm

D. 300 rpm

Solution:

23. What is the approximate life of the strobotron lamp if used at flashing speeds of less than 5,000 rpm?

A. 250 hours

B. 500 hours

C. 1200 hours

D. 300 hours

Solution:

24. What is the approximate life of the strobotron lamp if used at flashing speeds of more than 5,000 rpm?

A. 250 hours

B. 500 hours

C. 100 hours

D. 300 hours

Solution:

25. What are used as filters for the passage or rejection of specific frequencies?

A. Tuned circuits

B. Filter circuits

C. Band pass filter

D. High pass filter

Solution:

26. An elementary, single coil, dc generator will have an output voltage with how many pulsations per revolution?

A. One

B. Two

C. Three

D. Four

Solution:

27. How many commutator segments are required in a two-coil generator?

A. One

B. Two

C. Three

D. Four

Solution:

28. How can field strength be varied in a practical dc generator?

A. By varying the input voltage to the field coils

B. By varying the output voltage to the field coils

C. By increasing the number of field windings

D. By decreasing the number of field windings

Solution:

29. Are dc generators that are designed to act as high-gain amplifier?

A. Amplidynes

C. Dynamos

B. Synchros

D. Servos

Solution:

30. The power output of the amplidynes may be up to _______ times larger than the power input to its control windings.

A. 100,000

B. 10,000

C. 1,000

D. 100

Solution:

31 .What generators have both series field windings and shunt field windings?

A. Universal generator

B. Series-wound dc generator

C. Parallel-wound dc generator

D. Compound-wound dc generators

Solution:

32. The substrate of an N-channel MOSFET is made of what material?

A. P-type material

B. N-type material

C. Intrinsic material

D. Extrinsic material

Solution:

33. In a MOSFET, which element is insulated from the channel material?

A. The source terminal

B. The gate terminal.

C. The substrate terminal.

D. The drain terminal.

Solution:

34. What type of MOSFET can be independently controlled by two separate signals?

A. The single-gate MOSFET.

B. The four-gate MOSFET.

C. The dual-gate MOSFET.

D. The dual-drain MOSFET.

Solution:

35. What is the purpose of the spring or wire around the leads of a new MOSFET?

A. To prevent damage from static electricity.

B. To prevent damage from dynamic electricity.

C. To prevent damage from intense pressure. W

D. To prevent damage from intense temperature.

Solution:

36. What is a typical light-to-dark resistance ratio for a photocell?

A. 1:1000

B. 1:10000

C. 1:2000

D. 1:20000

Solution:

37. What semiconductor device produces electrical energy when exposed to light?

A. Photoelectronic cell

B. Photovoltaic cell

C. Photoelectric cell

D. Optoelectronic device

Solution:

38. The UJT has how many PN junctions?

A. One

B. Two

C. Three

D. Four

Solution:

39. The area between base 1 and base 2 in a UJT acts as what type of common circuit component?

A. Variable inductor

B. Variable capacitor

C. Variable resistor

D. Fixed resistor

Solution:

40. The sequential rise in voltage between the two bases of the UJT is called what?

A. A voltage spike

C. A voltage peak

D. A voltage surge

Solution:

41 .What is the normal current path for a UJT?

A. From base 1 to the emitter.

B. From base 1 to base 2.

C. From base 2 to the emitter.

D. From input to output.

Solution:

42. What is one of the primary advantages of the FET when compared to the bipolar transistor?

A. Low input impedance.

B. High input impedance.

C. Low output impedance.

D. High output impedance.

Solution:

43. The SCR is primarily used for what function?

A. The SCR is primarily used for amplifying.

B. The SCR is for both switching and amplifying.

C. The SCR is primarily used for switching power on or off.

D. The SCR is for any electronic application.

Solution:

44. When an SCR is forward biased, what is needed to cause it to conduct?

A. A drain signal.

B. A source signal.

C. A anode signal.

D. A gate signal.

Solution:

45. What is the only way to cause an SCR to stop conducting?

A. The forward bias must be reduced below the minimum conduction level.

B. The forward bias must be increased above the minimum conduction level.

C. The forward bias must be equal to the minimum conduction level.

D. The reverse bias must be reduced below the minimum conduction level.

Solution:

46. The TRIAC is similar in operation to what device?

A. SCS

B. UJT

C. SCR

D. DIAC

Solution:

47. When used for ac current control, during which alternation of the ac cycle does the TRIAC control current flow?

A. During both alternations.

B. With only one alternation.

C. During positive alternation only.

D. During negative alternation only.

Solution:

48. What type of bias is required to cause an LED to produce light?

A. Forward bias

B. Reverse bias

C. Either A or B

D. Neither A or B

Solution:

49. When compared to incandescent lamps, what is the power requirement of an LED?

A. Very high

B. High

C. Very low

D. Low

Solution:

5O. The varactor displays what useful electrical property?

A. Variable resistance

B. Variable capacitance

C. Variable inductance

D. Variable frequency

Solution:

51. When a PN junction is forward biased, what happens to the depletion region?

A. The depletion region decreases.

B. The depletion region increases.

C. The depletion region disappears.

D. The depletion region remains the same.

Solution:

52. When the reverse bias on a varactor is increased, what happens to the effective capacitance?

A. Capacitance increases.

B. Capacitance decreases.

C. Capacitance remains the same.

D. Temperature coefficient increases.

Solution:

53. In a reverse biased PN-junction, which current carriers cause leakage current?

A. The majority carriers.

B. The minority carriers.

C. The majority and minority carriers.

D. Either the majority or minority carriers.

Solution:

54. The action of a PN-junction during breakdown can be explained by what two theories?

A. Zener effect and avalanche effect.

B. Zener and flywheel effects.

C. Avalanche and flywheel effects

D. Zener and Miller effects.

Solution:

55. Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?

A. Miller effect

B. Avalanche effect

C. Zener effect

D. Flywheel effect

Solution:

56. The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?

A. 32

B. 42

C. 52

D. 62

Solution:

57. lf the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?

A. 340 V

B. 120 V

C. 240 V

D. 220 V

Solution:

58. The suppressor grid is added to a tetrode to reduce what undesirable characteristic of tetrode operation?

A. Primary emission

B. Secondary emission

C. Tertiary emission

D. Quaternary emission

Solution:

59. What type of bias requires constant current flow through the cathode circuit of a triode?

A. Anode biasing

B. Fixed biasing

C. Cathode biasing

D. Self biasing

Solution:

6O. How are computers classified?

A. Technology

B. Data they handle

C. Purpose

D. All of the choices

Solution:

61. Mechanical computers are considered to be of what type?

A. Analog

B. Digital

C. Special

D. General

Solution:

62. In a general-purpose computer, the ability to perform a wide variety of operations is achieved at the expense of what capabilities?

A. Speed and accuracy

B. Speed and memory capacity

C. Speed and efficiency

D. Speed and versatility

Solution:

63. All analog computers are what type of computers?

A. Special-purpose

B. Electromechanical

C. Mechanical

D. First generation

Solution:

64. What are analog computers designed to measure?

A. Electrical quantities

B. Physical quantities

C. Natural quantities

D. Continuous electrical or physical conditions.

Solution:

65. Early analog computers were what type of devices?

A. Mechanical or electromechanical

B. Solid state type

C. Vacuum type

D. Electrical

Solution:

66. What are computers called that combine the functions of both analog and digital computers?

A. Versatile computers

B. Hybrid computers

D. Mainframe computers

Solution:

67. What is the temperature range within which a disk will operate?

A. 10 to 50 degrees Celsius

B. 10 to 15 degrees Celsius

C. 20 to 60 degrees Celsius

D. 50 to 100 degrees Celsius

Solution:

68. What is the most basic type of filter?

A. The capacitor filter

B. Inductor filter

C. LC filter

D. Mechanical filter

Solution:

69. What is the range of values usually chosen for a choke?

A. From 20 to 100 H

B. From 1 to 20 H

C. From 1 to 10 H

D. From 10 to 20 H

Solution:

7O. What is the ripple frequency of a full-wave rectifier with an input frequency of 60 Hz?

A. 120 Hz

B. 240 Hz

C. 60 Hz

D. 360 Hz

Solution:

71. A standard programming language of the U.S. defense department similar to Pascal.

B. BASlC

C. C + +

D. RPG

Solution:

72. The electron tube replaces what component in an electron tube voltage regulator?

A. Variable inductor

B. Variable capacitor

C. Variable resistor

D. Transistor

Solution:

73. Which of the following is referred to as organized data?

A. Source

B. Information

C. Input

D. Output

Solution:

74. What is the common mode rejection ratio of an ideal differential amplifier?

A. Infinity

B. Unity

C. Less than unity

D. Zero

Solution:

75. The type of feedback used to improve the fidelity of an amplifier and to increase its frequency response.

A. Fidelity feedback

B. Positive feedback

B. Unwanted feedback

D. Negative feedback

Solution:

76. A negatively charge atom is sometimes called ______.

A. electron

B. cation

C. anion

D. ion

Solution:

77. If the magnitude of the potential difference is generated by a single conductor passing through a magnetic field, which of the following statements is false?

A. The potential difference depends on the speed with which the conductor cuts the magnetic field.

B. The potential difference depends on the length of the conductor that cuts the magnetic field.

C. The potential difference depends on the magnetic field density that is present.

D. The potential difference depends on the diameter of the conductor that cuts the magnetic field.

Solution:

78. What is the internal resistance of a 9 V battery that delivers 100 A when its terminals are shorted?

A. 0.09 โฆ

B. 11 โฆ

C. 1.0 โฆ

D. 90 โฆ

Solution:

79. Which of the following statements is true?

A. An ideal current source cannot be in parallel with a short circuit.

B. An ideal voltage source can be in parallel with an open circuit.

C. An ideal current source can be in series with an open circuit.

D. An ideal voltage source cannot be in series with an ideal current source.

Solution:

80. What is the average power dissipated by an electric heater with resistance of 50 โฆ drawing a current of 20sin (30t) A?

A. 0 kW

B. 10 kW

C. 14.14 kW

D. 20 kW

Solution:

81. What measurements are required to determine the phase angle of a single-phase circuit?

A. The power in watts consumed by the circuit.

B. The frequency, capacitance and inductance.

C. The power in watts, voltage and current

D. The resistance, current and voltage.

Solution:

82. The conductance and inductive susceptance of a circuit have the same magnitude. What is the power factor of the circuit?

A. 1

B. 0.707

C. 0.5

D. 0.866

Solution:

83. A circuit has a resonant frequency of 455 kHz and a bandwidth of 57.2 kHz. Find the Q of the circuit.

A. 795

B. 79.5

C. 0.795

D. 7.95

Solution:

84. A semiconductor logic output which pulls neither to a high nor a low voltage state.

A. Logic 1

B. Floating state

C. Logic 0

D. Limbo

Solution:

85 An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

A. Doping process

B. ionization

C. Thermal energy

Solution:

86. Refers to a field surrounding electrons and protons at stationary period indicating a stored energy.

A. Magnetic field

B. Electron field

C. Electrostatic field

D. Electrodynamic Held

Solution:

87. The time required to complete one cycle of a waveform.

A. Wavetime

B. Wavelength

C. Frequency

D. Period

Solution:

88. Lines of flux that do not follow the intended path.

A. Flux loss

B. Leakage flux

C. lnductance leakage

D. Hysteresis loss

Solution:

89. What consists of elements inseparably associated and formed on a single substrate?

A. Micro-circuit

B. Integrated circuit

C. Module

D. PCB

Solution:

90. What determines whether a substance is an insulator or a conductor?

A. Number of protons

B. Number of photons

C. Number of valence electrons

D. Number of neutrons

Solution:

91. What do you call the space between and around charged bodies?

A. Magnetic field

B. Electromagnetic field

C. Electromotive field

D. Electrostatic field

Solution:

92. What electrical quantity is measured by a watt-hour meter?

A. Current

B. Energy

C. Voltage

D. Power

Solution:

93. What do you call the process of converting chemical energy into electrical energy in a cell?

A. Electron flow

B. Polarization

C. Electrolysis

D. Electrochemical action

Solution:

94. A transformer has 500 turns in the primary and 1500 in the secondary. Assuming no losses, if 45 V is applied to the primary what is the voltage developed in the secondary?

A. 13.5 V

B. 180 V

C. 135 V

D. 90 V

Solution:

95. What do you call the maintenance of oscillation in a circuit in the intervals between pulses of excitation energy?

A. Auto-oscillation

B. Damping

C. Flywheel effect

D. Feedback

Solution:

96. A 15 ยตC point charge is located on the y-axis at (0, 0.25). A second charge of 10 ยตC is located on the x-axis at (0.25, 0). lf the two charges are separated by air, what is the force between them?

A. 0.0982 N

B. 0.341 N

C. 10.79 N

D. 33.93 N

Solution:

97. What is energy of motion called?

A. Potential energy

B. Kinematics

C. Pneumatics

D. Kinetic energy

Solution:

98. A fully charged lead-acid battery will indicate a specific gravity reading between.

A. 1.175 to 1.200

B. 1.200 to 1.225

C. 1.225 to 1.250

D. 1.275 to 1.300

Solution:

99. An effect about microwave oscillation that occurs in a small block of N-type gallium arsenide when a constant DC voltage above a critical value is applied to contact on opposite faces.

A. Gunn effect

B. Mossbauer effect

C. Edison effect

D. Miller effect

Solution:

100. What is the most influential factor in the switching speed of saturated bipolar transistor?

A. Charge storage

C. hfe

B. Collector current

D. hie

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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