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Question
Which of the following commutation methods is the overall circuit under damped?
Options
A. Class A
B. Class B
C. Class C
D. Both class A and Class B
Correct Answer
Both class A and Class B
More questions
1. The expression H
Z
= C cos(B
x
) cos(A
y
)
yz
is for
Options
A. TE wave
B. TM waves
C. both TE and TM waves
D. some TE and some TM waves
Show Answer
Scratch Pad
Discuss
Correct Answer: TE wave
Explanation:
In
TM
mode
H
z
= 0.
2. The resistance of a photoconductor
Options
A. increases with increase in light intensity
B. decreases with increase in light intensity
C. may increase or decrease with increase in light intensity
D. remains constant
Show Answer
Scratch Pad
Discuss
Correct Answer: decreases with increase in light intensity
3. In the given figure the time taken by the wave to make one round trip is
Options
A. 10
ns
B. 20
ns
C. 30
ns
D. 40
ns
Show Answer
Scratch Pad
Discuss
Correct Answer: 40
ns
Explanation:
4. In figure, V
EB
= 0.6 V, ? = 99. Then V
C
and I
C
are
Options
A. 9.3 V and 1.98 mA respectively
B. 4.6 V and 1.98 mA respectively
C. 9.3 V and 0.02 mA respectively
D. 4.6 V and 0.02 mA respectively
Show Answer
Scratch Pad
Discuss
Correct Answer: 9.3 V and 1.98 mA respectively
Explanation:
V
C
= 20 - 1.98 x 10
-3
x 5.4 x 10
3
≂ 9.3 V.
5. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?
Options
A. 1002 kHz
B. 1000 kHz
C. 999.2 kHz
D. 998.0 kHz
Show Answer
Scratch Pad
Discuss
Correct Answer: 1000 kHz
Explanation:
Frequency present in the sidebands is equal to =
f
c
±
f
m
,
f
c
± 2
f
m
,
f
c
± 3
f
m
.
6. A chopper is a high efficiency circuit.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
7. Most of the communication satellites are stationed to the West of their service areas in order to reduce their
Options
A. eclipse period
B. loss of power
C. battery power provision
D. mass of station-keeping fuel
Show Answer
Scratch Pad
Discuss
Correct Answer: battery power provision
8. In a klystron amplifier the transit time of electron passing the gap in the cavity should be
Options
A. less than one cycle
B. less than half cycle
C. less than quarter cycle
D. more than quarter cycle
Show Answer
Scratch Pad
Discuss
Correct Answer: less than quarter cycle
9. The domain mode in rectangular waveguide is
Options
A. TE
01
B. TE
02
C. TE
10
D. TM
11
Show Answer
Scratch Pad
Discuss
Correct Answer: TE
10
10. A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
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