Electronics and Communication Engineering - Power Electronics

1. 

Multiphase choppers are used in

A. low power circuits
B. high power circuit
C. both low and high power circuits
D. medium power circuits

Answer: Option B

Explanation:

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2. 

In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period

A. p
B. a
C. p - a
D.

Answer: Option A

Explanation:

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3. 

In a parallel inverter

A. each thyristor is turned on twice during each cycle
B. each thyristor is turned on once during each cycle
C. each thyristor is turned on either once or twice in each load cycle
D. each thyristor may be turned on upto four times in each load cycle

Answer: Option A

Explanation:

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4. 

A step up chopper can give an output voltage

A. higher than input voltage
B. lower than input voltage
C. both higher and lower input voltage
D. all of the above

Answer: Option A

Explanation:

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5. 

The specified maximum junction temperature of thyristors is about

A. 50°C
B. 80°C
C. 120°C
D. 200°C

Answer: Option C

Explanation:

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