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| ECE Board Exam Reviewer |
ECE Board Exam Reviewer
51. ECE Board Exam November 1996
Find the Thevenins impedance equivalent across R2 of a linear close circuit having 10 volt supply in series with two resistors (R1= 50 ohms and R2= 200 ohms).
A. 400 ohms
B. 40 ohms
C. 4 ohms
D. 4 k-ohms
52. ECE Board Exam November 1996
What is the process of converting multiple analog input signals sequentially to digital output?
A. Time division multiplexing
B. Analog to digital conversion
C. Space division multiplexing
D. Pulse code multiplexing
53. ECE Board Exam November 1996
What is the equivalent of decimal 15 in octal?
A. 15
B. 18
C. 17
D. 16
54. ECE Board Exam November 1996
________ is the transistor which fabricated as two complementary SCRs in parallel with common gate terminal.
A. Triac
B. Field effect transistor
C. Bilateral SCR
D. Unijunction transistor
55. ECE Board Exam November 1996
How many diodes will you use to have a basic half-wave rectifier?
A. Three
B. Four
C. Two
D. One
56. ECE Board Exam November 1996
Electric charge of neutron is the same as
A. proton
B. electron
C. current
D. atom
57. ECE Board Exam November 1996
The current of an electric circuit is analogous to _________ parameter of a magnetic circuit.
A. flux density
B. reluctivity
C. mmf
D. flux
58. ECE Board Exam November 1996
Find the filter capacitor that will provide 2.5 % ripple filtered voltage having a load of 120 mA, full wave rectified voltage of 36 V dc and 60 Hz supply.
A. 3117 microfarads
B. 3207 microfarads
C. 311.7 microfarads
D. 320.7 microfarads
59. ECE Board Exam November 1996
Which of the following solid state devices work on the phenomenon avalanche breakdown?
A. Triac
B. Unijunction
C. All of the above
D. Light activated SCR
60. ECE Board Exam November 1996
_______ is unipolar semiconductor device which the current is carried by the majority carriers only.
A. Field-effect transistor
B. Point-contact transistor
C. Zener diode
D. Junction transistor
61. ECE Board Exam November 1996
_________ is a gate which has 2 or more low input signals to get low output.
A. AND
B. Inverter
C. OR
D. NAND
62. ECE Board Exam November 1996
The main reason for the variation of amplifier gain with frequency is
A. due to interstage transformer
B. the presence of capacitance both external and internal
C. the logarithmic increases in its output
D. the Miller effect
63. ECE Board Exam November 1996
Component of solar battery which uses light energy to produce electromagnetic force
A. Alkaline cells
B. Polymer cells
C. Lithium cells
D. Selenium cells
64. ECE Board Exam November 1996
What is the term called magnetic field?
A. The force between the plates of a charged capacitor
B. A force set up when current flows through a conductor
C. Current flow through space around a permanent magnet
D. The force that drives current through a resistor
65. ECE Board Exam November 1996
Find the voltage drop developed across D’Arsonval meter movement having an internal resistance of 1 k-ohm and full deflection current of 150 micro amp.
A. 150 kV
B. 150 mV
C. 150 V
D. 150 micro V
66. ECE Board Exam November 1996
Kind of AC-motor, light load high speed or high load low speed
A. Synchronous motor
B. Squirrel cage motor
C. Split phase motor
D. Universal motor
67. ECE Board Exam November 1996
One of the following can program bipolar PROMs.
A. Biasing bipolar transistor
B. Blowing fuse
C. Enfusing input
D. Charging a gate
68. ECE Board Exam November 1996
In order to maintain same secondary output voltage, a power supply which operate from either 120 V or 240 V ac lines must have primary winding:
A. split exactly 1/3 from one end
B. split exactly 1/4 from one end
C. completely no split
D. split exactly 1/2 from one end
69. ECE Board Exam November 1996
What is the counter that follows the binary sequence?
A. Binary counter
B. Simplex counter
C. Shift counter
D. Decimal counter
70. ECE Board Exam November 1996
_______ are non-semiconductor devices still used in digital memories.
A. Gates
B. Flip-flops
C. Relay
D. Magnetic cores
71. ECE Board Exam November 1996
What is the reference cycle time use in radar, when the signal is transmitted and back to receiver?
A. 10.1 microsec
B. 100.0 microsec
C. 12.4 microsec
D. 24.8 microsec
72. ECE Board Exam November 1996
Process in industrial electronics where electrons are emitted from the surface of certain metals when expose to the light is called
A. photonics
B. photosensitive
C. phoovoltaic
D. photoemission
73. ECE Board Exam November 1996
A FET can act as an excellent buffer amplifier because
A. it has a low input impedance and high output impedance
B. it has a very high voltage gain and low noise level
C. it has a high input impedance and low output impedance
D. smaller size, longer life and lower efficiency
E. Eddy Currents
74. ECE Board Exam November 1996
What is the smallest element of a matter?
A. Neutron
B. Proton
C. Atom
D. Electron
75. ECE Board Exam November 1996
Refers to a pulse transmitter-receiver used in radio navigation and secondary surveillance radar to either a reply from transponder is called
A. ILS
B. Interrogator
C. Outer maker
D. Inner maker
76. ECE Board Exam November 1996
A triac behaves like two
A. diodes in series
B. resistors and one diode
C. four-layer diodes in parallel
D. inverse parallel connected SCRs with common gate
77. ECE Board Exam November 1996
________is called the flux density produced within, due to its own induced magnetism.
A. Electromagnetic field intensity
B. Magnetic field intensity
C. Intensity of magnetization
D. Electric field intensity
78. ECE Board Exam November 1996
The resonant circuit of a tuned-collector transistor oscillator has a resonant frequency of 5 MHz. If the value of capacitance is increased by 50%, calculate the new resonant frequency.
A. 3.33 MHz
B. 11.25 MHz
C. 2.6 MHz
D. 4.08 MHz
79. ECE Board Exam November 1996
The ability of a material to conduct magnetic flux through it refers to
A. permittivity
B. permeability
C. reluctivity
D. conductivity
80. ECE Board Exam November 1996
___________ is one factor that does not affect resistance.
A. Cross sectional area
B. Resistivity
C. Mass
D. Length
81. ECE Board Exam November 1996
Type of power line frequency meter device utilizing a principle of balancing an indicator needle at center at a scale using magnetic fields (resistive and inductive) opposing each other
A. Magnetic type
B. Resonant type
C. Resistive type
D. Electrodynamic type
82. ECE Board Exam November 1996
A measuring device or a meter made, so the pointer rests at the center of its scale zero current.
A. Linear meter
B. Galvanometer
C. Digital meter
D. Non-linear meter
83. ECE Board Exam November 1996
Part of the oscilloscope which produces bright spot through collection of electrons
A. Focus control
B. Heater cathode
C. Aquadag coating
D. Grid
84. ECE Board Exam November 1996
For a processor that uses 4-bit words, the largest number that can be represented using double precision is
A. 255
B. 15 (decimal)
C. 65,535
D. 127
85. ECE Board Exam November 1996
__________ refers to the class of logic circuit containing flip-flops.
A. Combinational
B. Sequential
C. Linear
D. Feedback
86. ECE Board Exam November 1996
How does junction diodes rated?
A. Maximum reverse current and PIV
B. Maximum forward current and PIV
C. Maximum forward current and capacitance
D. Maximum reverse current and capacitance
87. ECE Board Exam November 1996
What logic circuit is analogous to a single pole mechanical selector switch?
A. Decoder
B. Encoder
C. Multiplexer
D. Exclusive OR
88. ECE Board Exam November 1996
What do you call an electronic measuring equipment used in navigation which provides runway direction, distance and height guidance to permit blind landing?
A. DME
B. ODR
C. TACAN
D. ILS
89. ECE Board Exam November 1996
An encoder is an MSI (medium-scale-integration) circuit that
A. provides an output code that corresponds to which a set of input line is true
B. provides a storage of a certain number of binary bits
C. selects a given output based on binary input code
D. provides for delivering one of two or more inputs to an output
90. ECE Board Exam November 1996
In a high-fidelity system, the pair of filter which separate audio frequency band signals into two separate groups, one of which is fed to the tweeter and the other to the woofer is called
A. matching transformer
B. crossover network
C. equalizer
D. bridge network
91. ECE Board Exam November 1996
How long in nautical miles does the radar travel to and from at 12.4 microseconds?
A. 2 miles
B. 1 miles
C. 3 miles
D. 4 miles
92. ECE Board Exam November 1996
The ________ the Q of a circuit, the narrower is its bandwidth.
A. lower
B. higher
C. broader
D. selective
93. ECE Board Exam November 1996
Data selector is also called
A. encoder
B. decoder
C. multiplexer
D. demultiplexer
94. ECE Board Exam November 1996
The code 1011 in BCD is
A. 24
B. letter A
C. 11
D. invalid
95. ECE Board Exam November 1996
What is the equivalent of hexadecimal 1A in decimal?
A. 27
B. 26
C. 42
D. 40
96. ECE Board Exam November 1996
________ is the voltage applied in direct current circuit having a power of 36 watts and total resistance of 4 ohms.
A. 6V
B. 9V
C. 24V
D. 12V
97. ECE Board Exam November 1996
A two-pole, one phase motor has ____ field poles.
A. 8
B. 2
C. 6
D. 4
98. ECE Board Exam November 1996
_______ is a device used to store electrical energy in an electrostatic field?
A. Inductor
B. Battery
C. Transformer
D. Capacitor
99. ECE Board Exam November 1996
A memory circuit that has address inputs has how many storage locations?
A. 1024
B. 256
C. 512
D. not determined by sets of input
100. ECE Board Exam November 1996
High sensitive DC voltmeter provides accurate reading when measuring _______ circuits.
A. zero resistance
B. low resistance
C. at any resistance
D. high resistance
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