In a single phase full wave ac regulator feeding R-L load, the gate pulses are a

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Question
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)

Correct Answer

should be rectangular with width (p - a)

Power Electronics problems

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1. 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

2. 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

5. 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 auxiliary commutated chopper, the charging and discharging time of capacitor
Options
A. are constant
B. depend on load current
C. may be constant or may depend on load current
D. none of the above

9. The difference between resonant commutation and self commutation is
Options
A. both these methods are based on entirely different principles
B. in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current
C. resonant commutation uses L and C but self commutation uses only capacitor
D. none of the above

10. A cycloconverter for single phase operation has
Options
A. one positive group and one negative group converters
B. two positive group and two negative group converters
C. three positive group and three negative group converters
D. any of the above

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