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Question
A thyristor has a turn on time of 6 ?s. If the anode circuit is inductive, the turn on time will be
Options
A. 6 ?s
B. less than 6?s
C. more than 6 ?s
D. either 6 ?s or less
Correct Answer
more than 6 ?s
Explanation
Inductive load increases the turn on time.
More questions
1. The number of protons in germanium atom is
Options
A. 4
B. 16
C. 28
D. 32
Show Answer
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Discuss
Correct Answer: 32
2. A low ratio of the A.C. load impedance of a diode detector results in
Options
A. diagonal clipping
B. poor AGC operation
C. poor AF response
D. negative peak clipping
Show Answer
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Discuss
Correct Answer: negative peak clipping
3. To produce magnetic flux, mmf is necessary.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
4. The units of ?
0
and ?
r
are
Options
A. H/m for both
B. H/m for ?
r
and no units for ?
0
C. H/m for ?
0
and no units for ?
r
D. Wb/m for ?
0
and no units for ?
r
Show Answer
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Discuss
Correct Answer: H/m for ?
0
and no units for ?
r
Explanation:
?
r
is only a numeric.
5. An unmodulated voltage 10
V
effective is applied to a dioxide detector in which load resistance is 4 x 10
-5
ohms. A micrometer shows that the rectified DC current in this resistance is 30
A
. The efficiency of detection is
Options
A. 34%
B. 55.5%
C. 68.8%
D. 84.7%
Show Answer
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Discuss
Correct Answer: 84.7%
6. Some typical examples of macroscopic quantities are
Options
A. conductivity
B. µ
r
C. dielectric constant
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
7. Nichrome is used for
Options
A. overload line wires
B. heater coils
C. lamp filaments
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: heater coils
Explanation:
Because heater coil must be made of high resistivity material.
8. Yettrium-iron garnet (Y
2
Fe
5
O
12
) is a soft magnetic material suitable for applications involving
Options
A. dc
B. 50 Hz ac
C. ac of a few K Hz
D. ac of a few hundred MHz
Show Answer
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Discuss
Correct Answer: dc
Explanation:
Yettrium iron garnet has very low eddy current loss. Hence it is used at frequencies in MHz range.
9. Which of the following is used in automatic control of street lights?
Options
A. Thermistor
B. Photoconductor
C. Transistor
D. Varistor
Show Answer
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Discuss
Correct Answer: Photoconductor
10. A leaky dielectric has ?
r
= ?
r
'
-
j
?
r
"
. If a field
E
is applied, the current component in phase with E is proportional to ?
r
"
.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
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