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Power Electronics
Comments
Question
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
Correct Answer
Both A and R correct but R is not correct explanation of A
Power Electronics problems
Search Results
1. A step down cycloconverter has an input frequency
f
. If it uses natural commutation, the output frequency
Options
A. must be a sub-multiple of input frequency
B. can be any frequency
C. must be an even sub-multiple of input frequency
D. must be an odd sub-multiple of input frequency
Show Answer
Scratch Pad
Discuss
Correct Answer: must be a sub-multiple of input frequency
2. In a half bridge inverter circuit fed by a battery of voltage V, the rms value of fundamental component of output voltage is
Options
A.
2
V
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
3. A cycloconverter uses
Options
A. natural commutation
B. forced commutation
C. either natural or forced commutation
D. both natural and forced commutation together
Show Answer
Scratch Pad
Discuss
Correct Answer: either natural or forced commutation
4. The factor ? for a UJT is about
Options
A. 0.1
B. 0.2
C. 0.6
D. 0.9
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.6
5. Which of the following devices has two gates?
Options
A. SCR
B. SCS
C. SUS
D. SBS
Show Answer
Scratch Pad
Discuss
Correct Answer: SCS
6. Which statement is correct?
Options
A. BJT and MOSFET are current controlled devices
B. BJT is voltage controlled and MOSFET is current controlled device
C. BJT and MOSFET are voltage controlled devices
D. BJT is current controlled and MOSFET is voltage controlled device
Show Answer
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Discuss
Correct Answer: BJT is current controlled and MOSFET is voltage controlled device
7. A class E chopper
Options
A. can operate in second quadrant only
B. can operate in first or third quadrant
C. can operate in all the four quadrants
D. can operate in either second or third quadrant
Show Answer
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Discuss
Correct Answer: can operate in all the four quadrants
8. 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
Show Answer
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Discuss
Correct Answer: Both class A and Class B
9. In a full bridge single phase inverter feeding RLC load
Options
A. one thyristor and one diode conduct simultaneously
B. two thyristors conduct simultaneously
C. two thyristors or two diodes conduct simultaneously
D. four thyristors conduct simultaneously
Show Answer
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Discuss
Correct Answer: two thyristors or two diodes conduct simultaneously
10. In a parallel inverter the turn off time
t
q
of thyristor and values of commutating elements L and C are related as
Options
A.
t
q
=
p
LC
B.
t
q
=
LC
C.
t
q
=
LC
D.
t
q
=
LC
Show Answer
Scratch Pad
Discuss
Correct Answer:
t
q
=
LC
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