Electronics and Communication Engineering - Power Electronics

11. 

Surge current rating of an SCR is

A. the maximum repetitive surge current in which the SCR can withstand
B. the maximum non-repetitive surge current in which the SCR can withstand
C. the maximum repetitive or non repetitive surge current in which the SCR can withstand
D. the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

Answer: Option B

Explanation:

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12. 

Which of the following devices has metal-silicon junction?

A. General purpose power diode
B. Schottky diode
C. SCR
D. MOSFET

Answer: Option B

Explanation:

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13. 

In a single phase full wave converter (M-2 connection) feeding on R-L load the input voltage is v = Vm sin ωt. The expression for rms output voltage is

A.
B.
C.
D.

Answer: Option B

Explanation:

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14. 

A dc chopper is feeding an RLE load. The condition for maximum ripple is

A. a = 1
B. a = 0.8
C. a = 0.5
D. a < 0.5

Answer: Option A

Explanation:

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15. 

In a series inverter

A. the commutating elements L and C are in parallel
B. the commutating elements L and C are in series with load
C. the commutating L and C may be in series or parallel with the load
D. none of the above

Answer: Option B

Explanation:

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