Exercise: Power Electronics

Questions for: Power Electronics

In an ordinary thyristor
A:
turn on and turn off times are equal
B:
turn on time is more than turn off time
C:
turn off time is more than turn on time
D:
turn on time may be equal, less than or more than turn off time
Answer: C
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In a thyristors are i = kva. The value of a is
A:
about 0.5
B:
about 2
C:
about 5
D:
about 20
Answer: C
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In a step down chopper using time ratio control, the input voltage is V and duty cycle is a. The load is purely resistive having resistance R. The average and rms load currents are
A:
B:
C:
D:
Answer: B
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The characteristics of which device has peak point and valley point
A:
SCR
B:
PUT
C:
SCS
D:
Shockley diode
Answer: B
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In a full bridge inverter, the waveshape of load current depends on
A:
relative values of load parameters R, L and C
B:
relative values of load parameters R and L
C:
relative values of load parameters L and C
D:
gating frequency
Answer: A
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