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 + 71 degrees) volts
 B. V(t) = 24.8cos(ωt +3 9 degrees) volts
 C. V(t) = 25cos(ωt + 75 degrees) volts
 D. V(t) = 13.6cos(ωt + 75 degrees) 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 fus

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 kilo ohm
 B. 550 kilo ohm
 C. 55 kilo 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 45 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 2
W
 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