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Question
Current derating may be necessary when thyristors are operating in
Options
A. series
B. parallel
C. series or parallel
D. none of the above
Correct Answer
parallel
Explanation
Since current does not divide equally, current derating is necessary.
More questions
1. The maximum signal propagation time of a geosynchronous satellite transmission is about __________ millisecond.
Options
A. 540
B. 270
C. 135
D. 1080
Show Answer
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Discuss
Correct Answer: 270
2. In carbon resistor colour code, the third band is red. It indicates
Options
A. two zeros
B. three zeros
C. multiplier is 0.01
D. multiplier is 0.1
Show Answer
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Discuss
Correct Answer: two zeros
3. Low-orbit satellites are not used for communications because they
Options
A. produce sonic booms
B. do not provide 24 hour/ day contact to the users on Earth
C. heat up and melt
D. none
Show Answer
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Discuss
Correct Answer: heat up and melt
4. When a thyristor is conducting, the voltage drop across it is about
Options
A. 1 V
B. 10 V
C. 100 V
D. 0.1 V
Show Answer
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Discuss
Correct Answer: 1 V
5. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept
Options
A. equal to velocity of electron
B. slightly less than velocity of electron
C. slightly more than velocity of electron
D. equal to velocity of light in free space
Show Answer
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Discuss
Correct Answer: equal to velocity of electron
6.
Assertion (A):
SUS is a PUT and avalanche diode connected between gate and cathode
Reason (R):
SBS has two SUS inbuilt together and connected in anti-parallel
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct
Show Answer
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Discuss
Correct Answer: Both A and R correct but R is not correct explanation of A
7. In a CRO which of the following is not a part of electron gun
Options
A. cathode
B. grid
C. accelerating anode
D. X - Y plates
Show Answer
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Discuss
Correct Answer: X - Y plates
Explanation:
Electron gun consists of cathode, grid and accelerating anode.
8. Which of the following can be accessed only sequentially?
Options
A. Floppy disk
B. Hard disk
C. Magnetic tape
D. ROM
Show Answer
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Discuss
Correct Answer: Magnetic tape
Explanation:
Magnetic tape can be accessed only sequentially.
9. Which of the following is not a valid variable name in C?
Options
A.
p o, t
B.
p o t
C.
po
_
t
D.
p
_
ot
Show Answer
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Discuss
Correct Answer:
p o, t
Explanation:
Comma is not allowed.
10. A magnet does not attract
Options
A. nickel
B. iron
C. copper
D. iron and copper
Show Answer
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Discuss
Correct Answer: copper
Explanation:
Only copper is non-magnetic.
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