1. If bandwidth increases, the
a. center frequency decreases
b. Q decreases
c. Roll-off rate increases
d. Ripples appear in the stopband
2. The dc output of a bridge type circuit is ____ that of
equivalent center-tapped circuit.
a. the same as
b. more than
c. less than
d. none of these
3. Which of the following robot drive mechanism is
the cheapest to buy but has a limited payload?
a. thermionic
b. hydraulic
c. pneumatic
d. electric
4. The output of an OR gate will be low if
a. all inputs are HIGH
b. all inputs are LOW
c. one input is LOW
d. Undetermined
5. If a 175-V dc source were connected in series with
the utility mains from a standard wall outlet, the
result would be
a. smooth dc at a constant voltage
b. pure ac with equal peak voltages
c. ac with one peak voltage greater than the other
d. fluctuating dc
6. In constructing transformers, the primary and
secondary windings should have
a. good electrical coupling
b. loose magnetic coupling
c. tight magnetic coupling
d. best inductive coupling
7. If a sine wave voltage varies from 0-200 V, how
much is its instant voltage at 90 degrees?
a. minimum voltage
b. 200 V
c. 100 V
d. half of its maximum voltage
8. What is the typical slew rate of Fairchild 741 opamp?
a. 1 V/μs
b. 10 V/μs
c. 0.5 V/μs
d. 0.333 V/μs
9. Small microcomputer used as a dedicated
controller for a machine, a piece of equipment, or a
process.
a. Microcomputer
b. Microprocessor
c. Microcontroller
d. Supercomputer
10. Where do you classify cobalt as material?
a. Non-magnetic
b. Ferromagnetic
c. Paramagnetic
d. Diamagnetic
11. If the base-emitter junction is open, the collector
voltage is
a. Vcc
b. 0 V
c. floating
d. 0.2 V
12. The absolute maximum rating for op-amps
interval power dissipation is
a. 500mW
b. 300mW
c. 200mW
d. 100mW
13. The power dissipated in the core due to hysteresis
and eddy current losses
a. iron loss
b. copper loss
c. winding loss
d. friction loss
14. Which of the following is not an internal digital IC
fault?
a. open signal lines
b. shorted signal lines
c. faulty power supply
d. poor solder connections
15. A diode limiter circuit
a. is useful for voltage regulation
b. always uses zener diodes
c. rectifies the audio to reduce distortion
d. can cause objectionable signal distortion
16. An elementary generator consists of a single coil
rotating in a magnetic field. Why is no voltage
induced in the coil as it passes through the neutral
plane?
a. Flux lines are too dense
b. Flux lines are not present
c. Flux lines are not being cut
d. Flux lines are being cut in the wrong direction
17. A manufacturer quotes in his specifications that a
silicon diode conducts 50 mA at 1 V. Determines its
bulk resistance.
a. 20 ohms
b. 4 ohms
c. 14 ohms
d. 6 ohms
18. A radio equipment will be used to 70% at 50
amperes rating of 5 hours, how much capacity of dry
battery is needed?
a. 35
b. 17.5
c. 250
d. 175
19. Type of feedback employed in oscillators
a. negative
b. zero
c. positive
d. inductive
20. A digital circuit that oscillates between two
unstable output states.
a. monostable multivibator
b. astable multivibrator
c. bistable multivibrator
d. flip-flop
23. What is the normal resting state of the SET and
CLEAR inputs in a NAND gate latch?
a. SET=1, CLEAR=1
b. SET=0, CLEAR=1
c. SET=1, CLEAR=0
d. SET=0, CLEAR=0
24. Voltage that is present at the output of an
operational amplifier with its two inputs grounded.
a. common-mode signal
b. output offset voltage
c. input offset voltage
d. Ground voltage
25. Type of waveform generated by the sweep
generator of the CRT.
a. sine wave
b. spike
c. square wave
d. sawtooth
26. What are the primary methods of controlling
electrical power?
a. by using manual switches and rheostats
b. by using variable reactance and transformers
c. by using electronic switches, such as diodes,
transistors, thyratrons, and thyristors
d. all of these
27. Class of programmable logic devices wherein its
AND array is programmable while its OR array is hard
wired.
a. PAL
b. PLA
c. PLD
d. PROM
21. Capacitors are used to store data in
a. timers
b. op amps
c. multiplexers
d. none of these
28. Flux linkage equals
a. flux times area of the core
b. flux times the number of turns times area of the
core
c. flux times number of turns times length of the core
d. flux times number of turns
22. The input resistance of a common-base amplifier
is
a. very low
b. very high
c. the same as CE
d. the same as CC
29. The device used to use for rectifying a weak ac
signal is a
a. Zener diode
b. Light-emitting diode
c. Varistor
d. Back Diode
30. How many NAND-gates are required to form an
OR-gate?
a. 2
b. 3
c. 4
d. 5
31. What gain is significant when an op-amp is used
as a voltage comparator?
a. open-loop gain
b. common voltage gain
c. differential closed loop gain
d. closed loop gain
32. Process of repairing the ruptured crystal
structure caused by ion implantation by heating.
a. photolithography
b. Czochralski technique
c. diffusion
d. annealing
33. Suppose a purely resistive impedance of 75 Ω
must be matched to a purely resistive impedance of
300 Ω. A quarter-wave section would need to have
a. Zo = 188 Ω
b. Zo = 150 Ω
c. Zo = 225 Ω
d. Zo = 375 Ω
34. How many cells would a 16 word x 6 bit memory
contain?
a. 16
b. 96
c. 22
d. 108
35. Find the half-power bandwidth of a parallel
resonant circuit which has a resonant frequency of
8.1 MHz and Q of 150.
a. 21.1 kHz
b. 47.3 kHz
c. 18.52 kHz
d. 54 kHz
36. The purpose of the I layer in a PIN diode is to
a. minimize the diode capacitance
b. optimize the avalanche voltage
c. reduce the forward breakover voltage
d. increase the current through the diode
37. The typical saturation flux density for most
magnetic materials.
a. 0.1 Wb/m2
b. 2 Wb/m2
c. 10 Wb/m2
d. 20 Wb/m2
38. _____ is a measure of consistency of
measurements.
a. standards
b. precision
c. accuracy
d. exactness
39. A digital computer used for the automation of
industrial processes, such as control of machinery or
factory assembly lines.
a. microcontroller
b. motor
c. PLC
d. servo
40. A JFET always operates with
a. the gate-to-source pn junction reverse-biased
b. the gate-to-source pn junction forward-biased
c. the drain connected to the ground
d. the gate connected to the source
41. If Ic is 50 times greater than IB, then βDC is
a. 0.02
b. 100
c. 50
d. 500
42. What is the ripple frequency of a half-wave
rectifier with an input line frequency of 60 Hz?
a. 30 Hz
b. 60 Hz
c. 90 Hz
d. 120 Hz
43. Which of the following amplifiers is considered
linear?
a. class A
b. class B
c. class C
d. either class A or B
44. Electrical classification of materials having 8
electrons.
a. insulator
b. semiconductor
c. conductor
d. compound
45. A full 360° sine wave signal is applied to an
unknown class of amplifier. If the output delivers only
a pulse of less than 180° , what class does this
amplifier belongs?
a. class AB
b. class B
c. class C
d. class D
46. Which of the following is not a general
characteristic of an ac wave?
a. the wave shape is identical for each cycle
b. the polarity reverses periodically
c. the electrons always flow in the same direction
d. there is a definite frequency
47. A summing amplifier can have
a. No more than two input signals
b. Two or more input signals
c. A closed-loop input impedance of infinity
d. A small open-loop voltage gain
48. In an NPN circuit, the collector
a. has an arrow pointing inward
b. is positive with respect to the emitter
c. is biased at a small fraction of the base bias
d. is negative with respect to the emitter
49. The bandwidth of a multistage amplifier is _____
that of a single stage amplifier.
a. the same as
b. more than
c. less than
d. either A or B
50. A device used to mechanically measure the output
power of a motor.
a. dynamometer
b. Megger
c. concentric-vane instrument
d. Radial vane instrument
51. How many major lobes are produced by a
paraboloid reflector?
a. one
b. two
c. three
d. four
52. The main problem with a bar-graph meter is that:
a. it isn’t very sensitive
b. it isn’t stable
c. it can’t give a very precise reading
d. you need a special training to read it
53. What is the maximum efficiency of a full-wave
center-tapped rectifier?
a. 50%
b. 40.6%
c. 81.2%
d. 10%
54. Which of the following is false, concerning air
cores versus ferromagnetic cores?
a. air concentrates the magnetic lines of flux
b. air works at higher frequencies than ferromagnetic
c. ferromagnetic are lossy than air
d. a ferromagnetic core unit needs fewer turns of wire
than an equivalent air core unit
55. Which statement is wrong regarding μA741 when
its supply voltage is increased?
a. open-loop voltage gain will increase
b. increase power consumption
c. maximum voltage swing will increase
d. large variation in the input offset voltage
56. If a power supplies 30 V with no load and 20 V
under full load, what is the percentage regulation?
a. 33%
b. 66.67%
c. 75%
d. 50%
57. Which type of the following oscillator types uses
transformer coupling to feed back a portion of the
signal voltage. It is sometimes called a “tickler” coil.
a. Hartley circuit
b. Colpitts circuit
c. Clapp circuit
d. Armstrong circuit
58. A pulsating dc applied to power amplifiers causes
a. burning of transistor
b. hum in the circuit
c. excessive forward voltage
d. excessive reverse voltage
59. In a linear op-amp circuit, the
a. Signals are always sine waves
b. Op-amp does not go into saturation
c. Input impedance is ideally infinite
d. Gain-bandwidth product is constant
60. Situation when a circuit’s output level for a given
set of input conditions can be assigned as either a 1
or 0.
a. logic 1
b. logic 0
c. latch
d. don’t care
61. The regulator with the highest efficiency is the
a. shunt regulator
b. series regulator
c. switching regulator
d. Dc-to-dc converter
62. When a closed-loop system is used to maintain
physical position it is referred to as
a. gyro system
b. feedback system
c. servo system
d. differential system
63. An integrated circuit for both astable and
monostable applications.
a. 741 op-amp
b. discrete ICs
c. Monolithic ICs
d. 555 timer
64. Result obtained when a 1 is added to the least
significant bit position of a binary number in the 1’scomplement form.
a. 1’s complement
b. 2’s complement
c. 9’s complement
d. 10’s complement
65. Low sensitive DC voltmeter provides inaccurate
result when measuring ____ circuits.
a. zero resistance
b. high resistance
c. at any resistance
d. low resistance
66. Simple current limiting produces too much heat in
a. Zener diode
b. Load resistor
c. Pass transistor
d. Ambient air
67. When an armature opens in dc motor, it may
cause
a. intermittent sparking
b. an increase in speed
c. the motor to slow down
d. the motor to stop rotating
68. Suppose you have an unlimited supply of 1-W,
1000-Ω resistors, and you need a 500-Ω resistance
rated at 7 W or more. This can be done by assembling
a. four sets of two resistors in series, and connecting
these four sets in parallel
b. four sets of two resistors in parallel, and
connecting these four sets in series
c. a 3×3 series-parallel matrix of resistors
d. a series-parallel matrix, but something different
than those described above.
69. A significant advantage, in some situations, of a
toroidal coil over a solenoid is the fact that
a. the toroid is easier to wind
b. the solenoid cannot carry as much current
c. the toroid is easier to tune
d. the magnetic flux in a toroid is practically all within
the core
70. The input offset current is usually
a. less than the input bias current
b. equal to zero
c. less than the input offset voltage
d. unimportant when a base resistor is used
71. Combination of ac motor, dc generator, and exciter
to provide adjustable voltage dc power to a dc motor.
a. ward-leonard system
b. half-wave SCR
c. compound generator
d. universal motor
72. The ideal internal resistance of an emitter should
be
a. equal to the circuit resistance
b. zero
c. infinity
d. higher than circuit resistance
73. A frequency synthesizer has
a. high power output
b. high frequency drift rate
c. exceptional stability
d. an adjustable wave shape
74. The approximation with a maximally flat
passband is
a. Chebyshev
b. Inverse chebyshev
c. Elliptic
d. Bessel
75. Electron flow assumes charges flow from
a. negative to positive
b. negative to negative
c. positive to negative
d. positive to ground
76. The closed-loop voltage gain of an inverting
amplifier equals
a. The ratio of the input resistance to the feedback
resistance
b. The open-loop voltage gain
c. The feedback resistance divided by the input
impedance
d. The input resistance
77. A bubble memory is best suited for:
a. a large computer
b. a home video entertainment system
c. a portable cassette player
d. a magnetic disk
78. The operating frequency of a Wien-bridge
oscillator is given by _____.
a. 1/(2π√LC)
b. 1/(2πRC)
c. 1/(4πLC)
d. 1/(29RC)
79. In an LC oscillator, if the value of L is increased
four times, then frequency of oscillations is ____.
a. decreased two times
b. increased two times
c. decreased four times
d. increased four times
80. This type of electrical machine is used for varying
the input voltage into a higher or lower potential
without changing the power transferred.
a. motor
b. generator
c. transformer
d. alternator
81. Amplifier of low-level signals that provides an
output that is an accurate multiple of the difference
between two input signals.
a. Schmitt trigger
b. instrumentation amplifiers
c. level detector
d. integrator
82. Which of the following is not a characteristic of
CMOS chips?
a. sensitivity to damage by electrostatic discharge
b. low current demand
c. ability to work at high speed
d. ability to handle extremely high power
83. How are the networks able to transform one
impedance to another?
a. The matching network introduces
transconductance to cancel the resistive part of
impedance.
b. Resistance in the networks substitute for the
resistances in the load.
c. The matching network introduces negative
resistance to cancel the resistive part of an
impedance.
d. The matching network can cancel the reactive part
of an impedance and change the value of the resistive
part of an impedance.
84. Power source that converts desired electricity to
the other.
a. motor set
b. motor-generator set
c. voltage regulator
d. power regulator
85. It is a robot structure wherein the body can pivot
vertically and horizontally and that arms move
radially.
a. polar structure
b. pivotal
c. cylindrical structure
d. roborat
86. How do you determine if diode is effective?
a. diode resistance is either very high or very low in
either direction
b. high current
c. very low current
d. high voltage
87. The energy of an oscillator can be sourced by
a. coupling a small coil close to the tube
b. capacitance of inductive coupling from the tuned
circuit
c. Inserting resistor in grid circuit
d. connecting capacitor across the supply
88. Air works well as a dielectric mainly because it
a. has a high dielectric constant
b. is not physically dense
c. has low loss
d. allows for large capacitance in a small volume
89. An AC bridge that measures inductance in terms
of resistance and capacitance.
a. Owen’s bridge
b. Murray loop
c. Schering bridge
d. Kelvin bridge
90. A monopulse receiver has how many separate
channels?
a. one
b. two
c. three
d. four
91. A meter when _____ damped will become
insensitive to small signals.
a. underdamped
b. overdamped
c. critically damped
d. negatively damped
92. In a linear regulator, the control transistor is
conducting
a. a small part of the time
b. all of the time
c. only when the input voltage exceeds a limit
d. only when there is an overload
93. Each stage of a four-stage amplifier has a voltage
gain of 15. The overall voltage gain is
a. 60
b. 15
c. 50,625
d. 3078
94. With respect to memory, which of the following
terms means that the data contents vanish if power is
removed from a chip?
a. volatility
b. component density
c. multiplexing
d. corruptibility
95. What is the purpose of the emitter capacitor?
a. to forward bias the emitter
b. to reduce noise in the amplifier
c. to avoid drop in gain
d. to stabilize emitter voltage
96. The number of digits used by a number system.
a. digits
b. radix
c. 2n
d. n
97. A Schmitt trigger is used to provide
a. A short duration pulse
b. A long duration pulse
c. a digitally compatible output
d. All of these
98. One of the following items below is not one of the
main components of an alternating current power
supply.
a. power transformer
b. Filter
c. Voltage regulator
d. Rectifier
99. What are the two basic categories of industrial
robots?
a. autobots and deceptions
b. mechanical and electrical
c. fast and slow
d. pick and place manipulator and intelligent robot
100. What direction is the magnetic field about a
conductor when current is flowing?
a. in a direction opposite to the current flow
b. in all direction, omnidirectional
c. in the same direction of the current
d. in a direction determined by the left hand rule