Top 100 MCQS Series ECE/EE/EEE/ECT

1. ECE Board Exam November 1995

What is an electronic measuring equipment used in navigation operating in 1GHz band which provides bearing and distance indication?

• A. TACAN
• B. ODR
• C. ILS
• D. DME

2. ECE Board Exam November 1995

Find the output of four (4) lead acid cells.

• A. 3.2 V
• B. 8.4 V
• C. 5.8 V
• D. 1.6 V

3. ECE Board Exam November 1995

The reciprocal of capacitance is called

• A. elastance
• B. permittivity
• C. conductance
• D. permeability

4. ECE Board Exam November 1995

An advantage of full-wave rectifier over half-wave rectifier.

• A. Each diode can cool-off during half of each input cycle.
• B. The ripple frequency is lower.
• C. The tube will conduct during both halves of the cycle.
• D. Output voltage is lower with more ripples.

5. ECE Board Exam November 1995

What composes all matter whether a liquid, solid or gas?

• A. Atoms
• B. Electrons
• C. Protons
• D. Neutrons

6. ECE Board Exam November 1995

What is the majority carrier in an N material?

• A. Holes
• B. Neutrons
• C. Electrons
• D. Protons

7. ECE Board Exam November 1995

A very high resistance connected in parallel with smoothing capacitors in a high voltage DC system is called a

• A. dropping resistor
• B. shunt
• C. divider
• D. bleeder

8. ECE Board Exam November 1995

What is the smallest part of a computer language?

• A. Binary
• B. Byte
• C. Bit
• D. Word

9. ECE Board Exam November 1995

A user-program that has the ability to move a robot axis to any position within its range

• A. Point-to-point
• B. Continuous path
• C. Positive stop
• D. Pick-and-place

10. ECE Board Exam November 1995

What level is used to represent logic-1 in a negative logic circuit?

• A. Negative transition level
• B. Low level
• C. Positive transmission level
• D. High level

11. ECE Board Exam November 1995

What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same?

• A. Electromagnetic law
• B. Nortons law
• C. Lenz law
• D. Maxwells law

12. ECE Board Exam November 1995

What is the reason why robot actuators have lesser capabilities than electric or hydraulic robot actuators?

• A. It has quick response
• B. It always has oil leaks
• C. It always has all or nothing motion
• D. It has high initial cost

13. ECE Board Exam November 1995

_______ has the unit of electron volt.

• A. Charge
• B. Potential difference
• C. Energy
• D. Current

14. ECE Board Exam November 1995

What is the unit of magnetic flux in SI system?

• A. Weber
• B. Maxwell
• C. Tesla
• D. Gauss

15. ECE Board Exam November 1995

What element possesses four valence electrons?

• A. Insulator
• B. Semi-insulator
• C. Semiconductor
• D. Conductor

16. ECE Board Exam November 1995

What level is used to represent logic-0 in a negative logic circuit?

• A. High level
• B. Low level
• C. Negative transition level
• D. Positive transition level

17. ECE Board Exam November 1995

In an Amplitude-Modulated (AM) radio transmitter, the modulator is _________.

• A. How amplification can be thought of as a decision making process
• B. How semiconductor replace vacuum
• C. A digital decision
• D. How to adapt a radio transmitter to make it useful as multiplier circuit.

18. ECE Board Exam November 1995

Which of the following is the probable output if all inputs of a TTL gate are binary 1?

• A. Determinable
• B. Binary 0
• C. Binary 1
• D. Indeterminate

19. ECE Board Exam November 1995

Term used to describe sudden reverse conduction of an electronic component caused by excess reverse voltage across the device.

• A. Cut-off
• B. Saturation
• C. Avalanche
• D. Revertion

20. ECE Board Exam November 1995

Given the two voltages:

S(t)=10cos(ωt+30 degrees) volts

Q(t)=15cos(ωt+45 degrees) volts

Find V(t)=S(t) + Q(t)

• A. V(t)=5.9cos(ωt+71degrees) volts
• B. V(t)=24.8cos(ωt+39degrees) volts
• C. V(t)=25cos(ωt+75 degrees) volts
• D. V(t)=13.6cos(ωt+75degrees) volts

21. ECE Board Exam November 1995

What type of materials formed when trivalent material is doped with silicon or germanium?

• A. N type
• B. N and P type
• C. PN type
• D. P type

22. ECE Board Exam November 1995

What is the degree of exactness of measurement when compared to the expected value of the variable being measured?

• A. Accuracy
• B. Error
• C. Deviation
• D. Precision

23. ECE Board Exam November 1995

The overall gain of an amplifier in cascade is

• A. the sum
• B. the average of each
• C. the product
• D. 100 % the sum

24. ECE Board Exam November 1995

_________ is a byte of data stored in a memory location.

• A. 8 bits
• B. Character
• C. 4 bits
• D. Memory word

25. ECE Board Exam November 1995

An instrument used to measure one location in terms of coordinates.

• A. Global Positioning System
• B. Hydrometer
• C. Altimeter
• D. Increductometer

26. ECE Board Exam November 1995

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

• A. By computing the values of resistance
• B. Measure voltage drop across tube
• C. Measure voltage drop across known resistor
• D. Divide total circuit resistance by the total circuit load

27. ECE Board Exam November 1995

_________ is retrieving data from memory.

• A. Accessing
• B. Getting
• C. Encoding
• D. Reading

28. ECE Board Exam November 1995

Materials with permeabilities slightly less than that of free space are referred to as

• A. diamagnetic
• B. ferromagnetic
• C. non-magnetic
• D. paramagnetic

29. ECE Board Exam November 1995

________ can erase EPROMS.

• A. Applying a 21-volt pulse
• B. Applying ultraviolet rays
• C. Turning off the power
• D. Blowing fuse

30. ECE Board Exam November 1995

What materials possess permeabilities slightly less than that of free space?

• A. Non-magnetic
• B. Diamagnetic
• C. Paramagnetic
• D. Ferromagnetic

31. ECE Board Exam November 1995

An LC circuit resonates at 2000 kHz and has a Q of 100. Find the lower and upper cut-off frequencies.

• A. 1950 kHz, 2050 kHz
• B. 1900 kHz, 2100 kHz
• C. 1990 kHz, 2010 kHz
• D. 1980 kHz, 2020 kHz

32. ECE Board Exam November 1995

Find the ripple factor (Kr) of a sinusoidal signal with peak ripple of 4 volts and an average of 30.

• A. 0.094
• B. 0.013
• C. 0.130
• D. 0.94

33. ECE Board Exam November 1995

The term “Fully Saturated” for a transistor refers to:

• A. the collector current at its maximum value
• B. the collector current at its minimum value
• C. the transistor’s beta at its maximum value
• D. the transistor’s alpha at its maximum value

34. ECE Board Exam November 1995

The _________ grid in an electron tube is where the input signal is usually applied.

• A. screen
• B. control
• C. bias
• D. supression

35. ECE Board Exam November 1995

If three amplifiers with a gain of 8 each are in cascade, how much is the overall gain?

• A. 72
• B. 24
• C. 512
• D. 8

36. ECE Board Exam November 1995

_______ is a pn junction semiconductor device that emits noncoherent optical radiation when biased in the forward direction, as a result of a recombination effect.

• A. LASER
• B. JUGFET
• C. LED
• D. Optical cavity

37. ECE Board Exam November 1995

What do you call the force which sets up or tends to set up magnetic flux in a magnetic circuit?

• A. Electromotive force
• B. Potential difference
• C. Magnetomotive force
• D. Dynamic force

38. ECE Board Exam November 1995

Silicon diodes are used in a two-diode full-wave rectifier circuit to supply a load of 12 volts DC. Assuming ideal diodes and the load resistance is 12 ohms, compute the efficiency of the rectifier in percentage.

• A. 5.8
• B. 75
• C. 95.7
• D. 81.2

39. ECE Board Exam November 1995

In order to match the load to the generator means making load resistance _________.

• A. increased to more of generator’s internal resistance
• B. equal to generator’s internal resistance
• C. decreased
• D. lowered than generator’s internal resistance

40. ECE Board Exam November 1995

The purpose of installing thyrectors across the incoming power lines to speed the control system is to ______.

• A. cause the motor to caution
• B. protect drive circuits from high voltage transient surges
• C. increase counter-emf
• D. allow the field winding current to continue flowing

41. ECE Board Exam November 1995

The base SI unit of luminous intensity is

• A. lux
• B. lumen
• C. candela
• D. lambert

42. ECE Board Exam November 1995

The portion of the weld interval during which welding current is flowing

• A. Heat subinterval
• B. Release interval
• C. Cool interval
• D. Squeeze interval

43. ECE Board Exam November 1995

The difference in energy between the valence and conduction bands of a semiconductor is called

• A. band gap
• B. extrinsic photoeffect
• C. conductivity
• D. energy-density

44. ECE Board Exam November 1995

________ is a segment register which normally accesses variables in the program.

• A. Extra
• B. Stack
• C. Data
• D. Code

45. ECE Board Exam November 1995

What is the range of audio frequency?

• A. 10 to 10,000 Hz
• B. 16 to 20,000 Hz
• C. 3 to 2,000 kHz
• D. 10 to 2,000 Hz

46. ECE Board Exam November 1995

A __________ is a storage device used to accommodate a difference in rate of flow of data or time of occurrence of events when transmitting from one device to another.

• A. Accumulator
• B. Buffer
• C. Modem
• D. Register

47. ECE Board Exam November 1995

Solve the collector current if base current is 200 mA and the current gain is 20.

• A. 10 A
• B. 4 A
• C. 1 A
• D. 40 A

48. ECE Board Exam November 1995

_____ is the specific gravity reading for a good lead-acid cell.

• A. 1170
• B. 1270
• C. 1070
• D. 1370

49. ECE Board Exam November 1995

___________ refers to BCD counter

• A. Decade counter
• B. Shift relay
• C. Frequency divider
• D. Binary counter

50. ECE Board Exam November 1995

The typical number of bits per dynamic memory location is

• A. 1
• B. 8
• C. 2
• D. 16

51. ECE Board Exam November 1995

Find voltage regulation of a generator when full-load voltage is 110 V and no-load voltage is 120.

• A. 1 %
• B. 9.09 %
• C. 90.0 %
• D. 10 %

52. ECE Board Exam November 1995

In a system with MOS devices, the main bus loading factor is likely to be

• A. resistive
• B. current
• C. capacitive
• D. static charge

53. ECE Board Exam November 1995

The first recipient in E-mail communication.

• A. Host
• B. Mail box
• C. Computer`
• D. Disk

54. ECE Board Exam November 1995

When a power supply is constructed to operate from either 240V or 120V ac lines such that it will have same secondary output, its primary when connected from 240V must be

• A. split into halves and connected in parallel
• B. connected in series
• C. connected in parallel
• D. split into halves and connected in series

55. ECE Board Exam November 1995

Which has the largest diameter of the following dry cells?

• A. Type C
• B. Type AA
• C. Type AAA
• D. Type D

56. ECE Board Exam November 1995

_________ is an output applied to Read Only Memory (ROM).

• A. Multiplexer
• B. Address
• C. Input code
• D. Data

57. ECE Board Exam November 1995

________ is a kind of memory where only manufacturer can store program and has a group of memory locations each permanently storing a word.

• A. ROM
• B. SOS memory
• C. RAM
• D. Hard Memory

58. ECE Board Exam November 1995

_________ is an excess property of P-type semiconductor.

• A. Neutron
• B. Proton
• C. Electron
• D. Hole

59. ECE Board Exam November 1995

The best way to control speed of an AC induction motor is by varying the ________

• A. supply frequency
• B. both supply voltage and frequency simultaneously
• C. supply voltage
• D. series resistance of the field

60. ECE Board Exam November 1995

There are _________ identical cells in parallel needed to double the current reading of each cells.

• A. 3
• B. 4
• C. 2
• D. 1

61. ECE Board Exam November 1995

Two heaters A and B are in parallel across supply voltage V. Heater A produces 500 kcal in 20 minutes and B produces 1000 kcal in 10 minutes. The resistance of A is 10 ohms. What is the resistance of B, if the same heaters are connected in series voltage V?

• A. 0.14 ohms
• B. 4.5 ohms
• C. 2.5 ohms
• D. 4.5 ohms

62. ECE Board Exam November 1995

________is a low frequency oscillation which sometimes occurs under fault condition in electron tube circuits.

• A. Ping pong
• B. Jitter
• C. Glitch
• D. Motor boating

63. ECE Board Exam November 1995

The longer the diameter of a wire, the __________ is its resistance.

• A. unstable
• B. higher
• C. stable
• D. lesser

64. ECE Board Exam November 1995

When an atom gains an additional ______, it results to a negative ion.

• A. neutron
• B. proton
• C. electron
• D. atom

65. ECE Board Exam November 1995

_______ refers to circuits with 10 to 100 integrated circuits.

• A. IC
• B. Monolithic
• C. MSI
• D. SSI

66. ECE Board Exam November 1995

What is the most stable type of biasing?

• A. Current feedback
• B. Fixed bias
• C. Voltage divider
• D. Voltage feedback

67. ECE Board Exam November 1995

If the gain of an amplifier without feedback is 10 and with negative feedback is 8, then the feedback fraction is

• A. 0.025
• B. 0.9
• C. 0.8
• D. 0.225

68. ECE Board Exam November 1995

The ________ is an analog component that has two inputs, one inverting and the other non-inverting, and a single output terminal.

• A. counter
• B. op amp
• C. register
• D. flip-flop

69. ECE Board Exam November 1995

What do you call the duration within it takes to read the content of a memory location after it has been addressed

• A. Execution time
• B. Data rate
• C. Cycle time
• D. Access time

70. ECE Board Exam November 1995

What term in electronics is used to express how fast energy is consumed?

• A. Load
• B. Power
• C. Conductance
• D. Volt

71. ECE Board Exam November 1995

If a sine wave voltage varies from 0-200 V, how much is its instant voltage at 90%?

• A. 200 V
• B. Half of its maximum voltage
• C. 100 V
• D. Minimum voltage

72. ECE Board Exam November 1995

Device that increases power content from an input signal.

• A. Attenuator
• B. Amplifier
• C. Oscillator
• D. Transformer

73. ECE Board Exam November 1995

What is the lagging effect between the magnetizing force applied and the flux density?

• A. Hysteresis
• B. Permeance
• C. Reluctance
• D. Eddy Currents

74. ECE Board Exam November 1995

A solid-state device which only gives a “1” output if all its inputs are also “1” is called

• A. an AND gate
• B. a NAND gate
• C. a NOR gate
• D. an OR gate

75. ECE Board Exam November 1995

How much is the resistance of Germanium slag 10 cm long and cross sectional area of 1 squared cm?

• A. 5.5 k ohm
• B. 550 k ohm
• C. 55 k ohm
• D. 550 ohm

76. ECE Board Exam November 1995

A _______ is a device which can test all pins of an IC at the same time.

• A. logic probe
• B. current tracer
• C. logic clip
• D. pulser

77. ECE Board Exam November 1995

Current carried by each of two long parallel conductors is doubled if their separation is also doubled, the force between them would

• A. increase four-fold
• B. become half
• C. increase two-fold
• D. remain the same

78. ECE Board Exam November 1995

What is the first stage in electronic troubleshooting?

• A. Statistical analysis
• B. Symptom analysis
• C. Diagnostics
• D. Initiate plate testing

79. ECE Board Exam November 1995

Circuit that transforms dc from one voltage level to another or from one frequency to another

• A. Coupler
• B. Clipper
• C. Comparator
• D. Converter

80. ECE Board Exam November 1995

______ is an orderly pattern of combined silicon atoms.

• A. Covalent bond
• B. Valence orbit
• C. Semiconductor
• D. Crystal

81. ECE Board Exam November 1995

A crystal with its major flat surfaces cut so that they are perpendicular to a mechanical axis of the original quartz crystal is called

• A. a Y-cut crystal
• B. a Z-cut crystal
• C. an XY-cut crystal
• D. an X-cut crystal

82. ECE Board Exam November 1995

A good material conductor should have _______ valence electrons.

• A. 21
• B. 1
• C. 3.5
• D. 10

83. ECE Board Exam November 1995

The objective of a capacitor is to

• A. block AC and passes DC current
• B. block DC and passes AC current
• C. stores AC current
• D. blocks AC current

84. ECE Board Exam November 1995

________ is the characteristic of an oscillator that enables it to sustain oscillation after removal of the control stimulus.

• A. Momentum
• B. Fly-wheel effect
• C. Damping
• D. Forced oscillations

85. ECE Board Exam November 1995

__________ is the term used to express the amount of electrical energy in an electrostatic field.

• A. Coulombs
• B. Watts
• C. Volts
• D. Joules

86. ECE Board Exam November 1995

______ is a device that stays on once triggered and stores one of two conditions as a digital circuit.

• A. Gate
• B. Latch
• C. Integrator
• D. Oscillator

87. ECE Board Exam November 1995

When the cells are in series, voltages add, while current capacity is ______.

• A. the same as one cell
• B. zero
• C. infinite
• D. the sum of each cell

88. ECE Board Exam November 1995

In shift registers made up of several flip-flops, the clock signal indicates ________.

• A. a bit of information stored in the flip-flop
• B. information of time
• C. what time is it
• D. when to shift a bit of data from input of the flip-flop to the output

89. ECE Board Exam November 1995

A dc voltage supply is measured at 50 V and drops to 25 V when the load is connected. What is the value of “voltage regulation”?

• A. 5 %
• B. 50 %
• C. 8.33 %
• D. 11.11 %

90. ECE Board Exam November 1995

Which of the following statements is correct?

• A. Transistor has two terminals
• B. Open resistor has small resistance
• C. Typical power rating of a carbon-composition resistor ranged from 0.125 W to 2W
• D. Potentiometer has two terminals

91. ECE Board Exam November 1995

__________ is the major characteristics of an IC

• A. Complication
• B. Size
• C. Power consumption
• D. Speed

92. ECE Board Exam November 1995

Find the sum of binary number 1010 and 0011.

• a) 1021
• b) 1101
• c) 1011
• d) 1111

93. ECE Board Exam November 1995

The loss of electrical energy in counter balancing the residual magnetism in each cycle is called

• A. Eddy current loss
• B. Hysteresis loss
• C. Copper loss
• D. Leakage loss

94. ECE Board Exam November 1995

In order to simplify a circuit, in analysis and computation the diode is normally assumed as _________

• A. zero
• B. ideal
• C. imaginary
• D. infinite

95. ECE Board Exam November 1995

Files in an E-mail communication are send thru _________

• A. disk
• B. mailbox
• C. wires
• D. attachment

96. ECE Board Exam November 1995

An audible tone generated by combining two different frequencies in a non-linear circuit or as sound waves in air is called

• A. side tone
• B. beat tone
• C. heterodyne
• D. deadbeat

97. ECE Board Exam November 1995

__________ are electrons at the outer shell.

• A. Inside shell electrons
• B. Conductor electrons
• C. Outside shell electrons
• D. Valence electrons

98. ECE Board Exam November 1995

Solve for flux density (in gauss) from a magnetic flux of 5,000 Mx through a perpendicular are of 2 cm x 5 cm.

• A. 5000 G
• B. 500 G
• C. 10,000 G
• D. 50 G

99. ECE Board Exam November 1995

Refers to the increased used of data conversion circuits as a result of increased application.

• A. OP AMPS
• B. Linear circuits
• C. Computers
• D. Digital equipment

100. ECE Board Exam November 1995

The decibel gain of cascaded amplifiers equals the

• A. sum of voltage and current gains
• B. product of individual gains
• C. difference of individual gains
• D. sum of individual gains

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