Electronics and Communication Engineering - Power Electronics

31. 

A thyristor circuit is feeding an R-L load. The turn on time can be reduced by

A. decreasing R
B. decreasing L
C. increasing L
D. decreasing R and L together

Answer: Option B

Explanation:

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32. 

A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a. The freewheeling diode conducts for

A. a° in each half cycle
B. (p - a)° in each cycle
C. a° in one full cycle
D. (p + a)° in each half cycle

Answer: Option A

Explanation:

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33. 

In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is

A.
B.
C.
D.

Answer: Option B

Explanation:

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34. 

In a single phase full wave regulator feeding a resistive load, the average current over one full cycle

A. is always zero
B. cannot be zero
C. may be sometimes zero
D. is always positive

Answer: Option A

Explanation:

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35. 

Two single phase semi-converters are connected in series to form a series converter. The input is v = Vm sin ωt and a1, a2 are the firing angles. If a1 = 0, the dc output voltage is

A. (1 + cos a2)
B. (2 + cos a2)
C. (3 + cos a2)
D. (4 + cos a2)

Answer: Option C

Explanation:

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