Exercise: Power Electronics

Questions for: Power Electronics

In auxiliary commutated chopper, the peak value of thyristor current is
A:
equal to peak value of load current
B:
equal to peak value of capacitor current
C:
sum of peak value of load current and capacitor current
D:
none of the above
Answer: C
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Which of the following devices has two gates?
A:
SCR
B:
SCS
C:
SUS
D:
SBS
Answer: B
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A TRIAC can be turned on :
A:
by applying a positive signal to gate
B:
by applying a negative signal to gate
C:
by applying either positive or negative signal to gate
D:
none of the above
Answer: C
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In a parallel inverter the turn off time tq of thyristor and values of commutating elements L and C are related as
A:
tq = pLC
B:
tq = LC
C:
tq = LC
D:
tq = LC
Answer: C
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A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
A:
0.5, 100 V and 1
B:
0.25, 50 V and 3
C:
0.25, 50 V and 1
D:
0.5, 100 V and 3
Answer: B
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