1. A group of circuits that provides timing and
signals of all operations in the computer.
A. Output unit
(B) Memory unit
C. Control unit
D. Input unit
2. Where does the voltage generated in a DC
generator depend?
(A) Field resistance and flux
B. Field and armature current
C. Flux and speed
D. Speed and field resistance
3. ________ is the most influential factor in the
switching speed of saturated bipolar transistor.
A. Charge storage
B. Collector current
C. HFE
(D) Base current
4. What is a pi-network?
A. A power incidence network.
(B) A network consisting of one inductor and
two capacitors or two inductors and one capacitor.
C. A network consisting entirely of four
inductors or four capacitors.
D. An antenna-matching network that
Isolates it from ground.
5. What is the SI unit of magnetic flux?
(A) Weber
B. Gauss
C. Maxwell
D. Tesla
6. ______ is the type of linear regulator used in
applications requiring efficient utilization of the
primary power source.
A. A series regulator
(B) A shunt regulator
C. A constant current source
D. A shunt current source
7. When a switch is closed, it has a total resistance of
A. 100 Ω at room temperature
B. unstable
(C) infinity
D. Zero
8. How many turns are needed to produce magnetizing
force of 5000 A.T. for coil of 50 amperes?
A. 1,000 turns
B. 5,000 turns
(C) 100 turns
D. 500 turns
9. When an SCR id triggered or in on condition,
its electrical characteristics are similar to what
other solid state device (as measured between its
cathode and anode).
(A) The junction diode
B. The varactor diode
C. The tunnel diode
D. The hot-carrier diode
10. What special type of diode is capable of both amplification
and oscillation?
A. point contact diode
B, Junction diode
(C) Zener diode
D. Tunnel diode
11. A static memory generally contains
(A) row and column decoders
B. no decoders
C. row decoders
D. column decoders
12. What are the majority carrier in an n-type semi-conductor?
(A) Electrons
B. Positive ions
C. Negative ions
D. Holes
13. Steel is hard to magnetize because of its
A. high retentivity
(B) low permeability
C. high permeability
D. high density
14. When you increase the resistance in a circuit,
the flow of electrons will
A. increase
B. be constant
(C) be decreased
D. cease
15. Current in a chemical cell refers to the movement of
A. negative ions only
(B) negative and positive ions
C. positive ions only
D. hole charges
16. What is the effect of light in a photodiode?
(A) Reverse current
B. Limits flow of current
C. Forwards current
D. Renders unstable current
17. What is the effect in terms of bandwidth when the Q
of a signal tuned stage is doubled?
A. Doubled
B. The same
(C) Halved
D. Four times
18. What is the range of voltage rating available in
zener diodes?
A. 2.4 volts to 200 volts
(B) 1.2 volts to 7 volts
C. 3 volts to 3000 volts
D. 1.2 volts of 5.6 volts
19. What type of transformer that is used to protect
technicians and operators from deadly electrical shock?
A. Absorber transformer
(B) Step down transformer
C. Step up transformer
D. Isolation transformer
20. When batteries have cells connected in series, the effect is
A. reduced output voltage
(B) increased current supply
C. increased voltage supply
D. reduced internal resistance
21. A _______ is an instruction in a source language that is to be
replaced by a defined sequence of instruction in the same source
language.
A. statement
B. source code
C. mnemonic
(D) macro-instruction
22. How many op-amps does a window comparator require?
(A) 2
B. 4
C. 3
D. 1
23. What is the memory elements used in clocked sequential
logic circuit?
A. Gate
B. Flip-flop
(C) Static RAM
D. Read-only memory
24. ________for a transistor to be cut off.
A. Maximum current flows from emitter to collector
B. The transistor is at its operating point
C. No current flows from emitter to collector
(D) There is no base current
25. Common base (CB) amplifier has _____ compared to
Common-emitter and common collector amplifiers.
A. a higher input resistance
B. a large current resistance
(C) a lower input resistance
D. a larger voltage gain
26. ______ currents are wasteful currents which flow in cores
of transformers and produce heat.
A. Residual
(B) Eddy
C. Sneak
D. Magnetizing
27. Which of the following is photocell most sensitive to?
(A) Radio waves
B. Sound waves
C. light waves
D. Heat waves
28. What law determines the polarity of an induced voltage?
A. Norton’s law
B. Thevenin’s law
(C) Lenz’s law
D. Faraday’s law
29. What happens in the resistance of copper wire when its
Temperature is raised?
(A) It decreases
B. Unaffected
C. It increases
D. Becomes zero
30. The science of physical phenomenon at very low temperatures,
Approaching absolute zero is called
A. cryptanalysis
B. cybernetics
C. temperature inversion
(D) cryogenics
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