Electronics and Communication Engineering - Power Electronics

1. 

In a single phase full wave ac regulator feeding R-L load, the gate pulses

A. are always of short duration
B. may be of short duration
C. should be rectangular with width (p - a)
D. cannot be rectangular with width (p - a)

Answer: Option C

Explanation:

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2. 

In a semi converter feeding a resistive load,

A. the waveshapes of input voltage and input current are always similar
B. the waveshapes of input voltage and input current can never be similar
C. the waveshapes of input voltage and input current are similar only if firing angle is zero
D. the waveshapes of input voltage and input current are similar only if firing angle is high

Answer: Option C

Explanation:

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3. 

In a single phase semi-converter the number of thyristors is

A. 16
B. 8
C. 4
D. 2

Answer: Option D

Explanation:

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4. 

A dc chopper is feeding an RLE load. The current can become discontinuous if

A. is high
B. a is low
C. E is high
D. none of the above

Answer: Option D

Explanation:

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5. 

Which of these commutation methods uses two leads?

A. Class A
B. Class B
C. Class C
D. Class D

Answer: Option D

Explanation:

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