Electronics and Communication Engineering - Power Electronics

26. 

A single phase converter is fed by a source having an inductance L. If load current is I0, the decrease in output voltage due to overlap is

A.
B.
C.
D.

Answer: Option C

Explanation:

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27. 

Assertion (A): An ac regulator uses natural commutation

Reason (R): An ac regulator can be used for static on load tap changing of transformer.

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

Answer: Option B

Explanation:

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28. 

When a UJT is used as a relaxation oscillator the current should be

A. less than Ip
B. more than Iv
C. more than Ip but less than Iv
D. negative

Answer: Option C

Explanation:

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29. 

In auxiliary commutated chopper, the charging and discharging time of capacitor

A. are constant
B. depend on load current
C. may be constant or may depend on load current
D. none of the above

Answer: Option B

Explanation:

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30. 

Which chopper circuit uses saturable reactor?

A. Auxiliary commutated
B. Jones chopper
C. Morgan chopper
D. Load commutated

Answer: Option C

Explanation:

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