Electronics and Communication Engineering - Power Electronics

36. 

Assertion (A): A class C chopper can operate in first and second quadrants

Reason (R): A class B chopper operates only in second quadrant.

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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37. 

A single phase dual converter consists of

A. two fully controlled converters connected in parallel
B. two fully controlled converters connected in antiparallel
C. two fully controlled semiconverters connected in antiparallel
D. two fully controlled semiconverters connected in parallel

Answer: Option B

Explanation:

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38. 

The snubber circuit consists of

A. a capacitor connected in series with thyristor
B. a capacitor connected in parallel with thyristor
C. a resistor and capacitor in series connected across thyristor
D. none of the above

Answer: Option C

Explanation:

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39. 

The effect of source inductance in a 3 phase fully controlled bridge converter is to

A. decrease the output voltage
B. increase the output voltage
C. decrease the output voltage and increase the output current
D. increase the output voltage and decrease the output current

Answer: Option A

Explanation:

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40. 

In disc mounting of SCR

A. SCR is clamped on one side of disc shaped heat sink
B. SCR is clamped between two disc shaped heat sinks
C. The SCR has low current rating
D. None of the above

Answer: Option B

Explanation:

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