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Analog Electronics
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Question
To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
Options
A. surge resistor
B. surge inductor
C. surge capacitor
D. both (a) and (b)
Correct Answer
surge resistor
Explanation
Resistor reduces surge current.
More questions
1. In the given figure forward voltage wave has a magnitude
Options
A. 90 V
B. 60 V
C. 30 V
D. 10 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 30 V
2. During forward blocking state of SCR, the voltage and current respectively are
Options
A. high and high
B. low and low
C. high and low
D. low and high
Show Answer
Scratch Pad
Discuss
Correct Answer: high and low
Explanation:
Voltage is high but current is nearly zero.
3. Match the following:
List I
List II
A.
CTFS
1.
Periodic
B.
DTFS
2.
Non-periodic
C.
CTFT
D.
DTFT
Options
A. A-2, B-1, C-2, D-2
B. A-2, B-1, C-2, D-1
C. A-1, B-2, C-2, D-2
D. A-1, B-2, C-2, D-1
Show Answer
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Discuss
Correct Answer: A-2, B-1, C-2, D-1
4. For the system in the given figure. The transfer function C(
s
)/R(
s
) is
Options
A. G
1
+ G
2
+ 1
B. G
1
G
2
+ 1
C. G
1
G
2
+ G
2
+ 1
D. G
1
G
2
+ G
1
+ 1
Show Answer
Scratch Pad
Discuss
Correct Answer: G
1
G
2
+ G
2
+ 1
Explanation:
Transfer function = (G
1
+ 1) G
2
+ 1 = G
1
G
2
+ G
2
+ 1.
5. In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is
Options
A. 20 A
B. 13.33 A
C. 6.67 A
D. 3.33 A
Show Answer
Scratch Pad
Discuss
Correct Answer: 13.33 A
6. In the given figure the ratio T/
d
is the duty factor.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
Explanation:
.
7. In van der walls crystals, there exists a high degree of stability of the outer electron shell.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
Explanation:
This is the reason for chemical inactivity in these crystals.
8. If ?
r
'
and ?
r
"
are the real and imaginary parts of complex dielectric constant ?
r
, and ? is the loss angle. Then
Options
A.
B.
C. tan ? = ?
'
?
"
D. tan ? = 1 - ?
'
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
If ?
r
"
= 0, ? = 0.
9. The passband of the tuned circuits of a radio receiver should be equal to
Options
A. 20 kHz
B. 455 kHz
C. 1455 kHz
D. more than 455 kHz
Show Answer
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Discuss
Correct Answer: 20 kHz
10. In a radio receiver with simple AGC
Options
A. the highest AGC voltage is produced between stations
B. the faster the AGC time constant, the more accurate the output
C. an increase in signal strength produces more AGC
D. the audio stage gain is normally controlled by AGC
Show Answer
Scratch Pad
Discuss
Correct Answer: an increase in signal strength produces more AGC
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