Electronic Test 6 Volume 1

1.refers to a form of dc motor-generator with
common field coil for both motor and generator.
A. Motor-generator
(B) Dyna-motor
C. Polyphase motor
D. Synchronous motor
2. Which of the following filters has the most
ripple considering the same secondary
voltage and filter?
(A) Half-wave rectifier
B. Full-wave rectifier
C. Bridge-type rectifier
D. Center-tapped rectifier
3. How do you call an eight element vacuum tube?
A. Pentode
B. Hexode
(C) Octode
D. Septode
4. A. bipolar stage has two unwanted ______ at
high frequencies.
A. capacitance
B lead network
C. inductance
(D) bypass circuits
5. What is the most widely used LC oscillator?
A. Hartley
B. Armstrong
(C) Colpitts
D. clap
6. Find the flux density in Gauss having a flux of
20,000 Mx through a perpendicular area of 2 cm².
A. 20,000 G
(B) 10,000 G
C. 40,000 G
D. 22,000 G
7. A four-layer diode is sometimes called a
(A) pnpn diode
B. switch
C. diac
D. UJT
8. Process by which a magnetic substance
becomes a magnet when it is placed near
a magnet.
A. Electromagnetic induction
B. Magnetic reflection
C. Influx of density
(D) Magnetic induction
9. A bridge rectifier works on how much of the ac cycle?
A. 90º
B. 180º
C. 270º
(D) 360º
10. A series connected coil and capacitor will
present no reactance at
(A) one particular frequency
B. two particular frequencies
C. infinite frequencies
D. any frequency
11. What is the effect of a feedback resistor?
A. It decreases input impedance
(B) It stabilizes voltage gain
C. It increasers distortion
D. It increases collector resistance.
12. _________ is the output of a half-wave rectifier.
(A) Half-wave rectified signal
B. Square wave signal
C. 100% AC signal
D. Sinusoidal signal
13. The term used to describe the process
whereby two transistor with positive
feedback are used to simulate the action of
the thyristor.
A. Arcing
(B) Latching
C. Damping
D. Switching
14. ________is a thin polished slice of a semiconductor
crystal on which integrated circuit can be fabricated often
in duplicate, for cutting into individual dice.
A. Silicon
B. Indium
C. Gallium
(D) Water
15. When a ferromagnetic core is placed inside a
certain coil originally having an air core its
reactance _______ assuming constant frequency.
A. stays the same
B. becomes zero
(C) decreases
16. A conductor behaves as a/an _______ at
absolute zero temperature.
A. semiconductor
B. conductor
(C). super conductor
D. insulator
17. A comparator with a trip point of zero is
sometimes called a
A. threshold detector
B. half-wave detector
(C) positive-limit detector
D. zero-crossing detector
18. What happens to the ac input voltage if the
emitter bypass capacitor is shorted?
(A) Decrease
B. Increase
C. Remains the same
D. Cannot be determined
19. The initial slope of a sine wave increases when
A. slew rate decreases
B. slew rate increases
(C) peak value increases
D. peak value decreases
20. An insulating element or material has the capacity of
A. conducting large current
B. storing high current
C. storing high voltage
(D) preventing short circuit between two
conducting wires.
21. A radio equipment will use 70 % at 50
Amperes rating for 5 hours, howmuch
Capacity of a dry battery is needed?
A. 35
B. 17.5
C. 250
(D) 175
22. One of the following characteristics of a
Resistive material which does not change
Its resistive value respect to time is its
A. fidelity
(B) stability
C. sensitivity
D. selectivity
23. What do you call he oscillator circuit that
Uses a tapped coil in the tuned circuit?
A. Pierce
B. Colpitts
(C) Hartley
D. Armstrong
24. A way of improving the efficiency of an amplifier.
A. Reducing supply voltage
(B) Decreasing unwanted power losses
C. Increasing supply current
D. Reducing load power
25. The Q-point will be located at ______ if the
base resistor is open.
(A) the lower end of the load line
B. the upper end of the load line
C. the middle of the load line
D. the load line
26. Op-amplifier can amplify
A. ac signal only
B. dc signal only
(C) both ac and dc signals
D. neither ac nor dc signals.
27. A frequency multiplier is tuned to
A. a fundamental frequency
(B) a harmonic frequency
C. the ripple frequency
D. a sub-harmonic frequency
28. The anode of a semiconductor diode indicates a _______
change during conduction.
A. positive
B. neutral
(C) negative
D. either or depending on design
29. What is the process used to describe analog-
to-digital conversion?
A. Binarize
B. Linearize
(C) Digitize
D. Analogize
30. The unity-gain frequency equals the product
Of critical frequency and
A. load resistance
(B) mid-band voltage gain
C. tail current
D.compensating capacitance