power-electronics electronics-and-communication-engineering question and answers -Page 27

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Power Electronics problems

1. In the basic series inverter circuit, the source current has
Options
A. low harmonic content
B. high harmonic content
C. low or high harmonic content depending on firing angle
D. zero harmonic content

2. Assertion (A): Chopper always requires forced commutation
Reason (R): Morgan chopper uses a saturable reactor.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

4. A single phase half wave converter is feeding-a resistor load. The input voltage is v = V_m sin ?t. If firing angle is zero, the output dc voltage V_dc and output rms voltage V_rms respectively
Options
A.
B.
C.
D.

7. In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to
Options
A. 50% of peak reverse current
B. 25% of peak reverse current
C. 10% of peak reverse current
D. zero value

8. In a semi converter feeding a resistive load,
Options
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

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

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