The average load current supplied by a thyristor depends on firing angle firing

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Question
The average load current supplied by a thyristor depends on
Options
A. firing angle
B. firing frequency
C. magnitude of gate current
D. all of the above

Correct Answer

firing angle

Explanation

The firing angle controls the period of conduction and hence average load current.

Power Electronics problems

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1. A single phase series converter is used for
Options
A. high voltage output
B. high current output
C. high voltage and high current output
D. improving the circuit efficiency

2. Assertion (A): An inverter does not require forced commutation
Reason (R): A series inverter is a forced commutation inverter.
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

3. A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90�, the speed is likely to be
Options
A. about 300 rpm
B. about 150 rpm
C. about 75 rpm
D. about zero

4. HVDC transmission systems generally use
Options
A. 12 pulse converters
B. 6 pulse converters
C. 3 pulse converters
D. either 12 or 6 pulse converters

7. A high frequency series inverter consists of
Options
A. a number of series inverters in series
B. a number of series inverters in parallel
C. a number of parallel inverters in parallel
D. a number of parallel inverters in series

8. When thyristors are connected in series and parallel, it may be necessary to have :
Options
A. current derating
B. voltage derating
C. both current and voltage derating
D. none of the above

9. In the below figure, the average value of load current is 15 A. The load is highly inductive. The peak value of thyristor current is
Options
A. 15 A
B. 152 A
C.
D. 30 A

10. In a multiphase chopper, the different choppers operate in
Options
A. series and all simultaneously
B. parallel and one at a time
C. parallel and simultaneously
D. either (b) or (c)

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