Surge current rating of an SCR is the maximum repetitive surge current in which

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Question
Surge current rating of an SCR is
Options
A. the maximum repetitive surge current in which the SCR can withstand
B. the maximum non-repetitive surge current in which the SCR can withstand
C. the maximum repetitive or non repetitive surge current in which the SCR can withstand
D. the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

Correct Answer

the maximum non-repetitive surge current in which the SCR can withstand

Power Electronics problems

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1. A 3 phase dual converter consists of
Options
A. two 3 phase semiconverters connected in parallel
B. two 3 phase semiconverters connected in antiparallel
C. two 3 phase full converters connected in antiparallel
D. two 3 phase full converters connected in parallel

3. If the frequency is less than the damped frequency in a series- inverter
Options
A. the distortion of output voltage waveform is low
B. the distortion of output voltage waveform is high
C. the distortion of output voltage may be high or low depending on the load impedance
D. none of the above

4. In a series inverter
Options
A. the commutating elements L and C are in parallel
B. the commutating elements L and C are in series with load
C. the commutating L and C may be in series or parallel with the load
D. none of the above

5. Which inverter circuit uses coupled inductors?
Options
A. Modified McMurray full bridge inverter
B. McMurray Bedford half bridge inverter
C. Modified McMurray Bedford half bridge inverter
D. Both (b) and (c)

6. A surge voltage
Options
A. has very high magnitude and very long duration
B. has very high magnitude and very small duration
C. has very high magnitude and very small duration and can be positive or negative
D. can be only positive

8. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains
Options
A. 3 full waves of input
B. 3 half waves of input
C. 6 full waves of input
D. 6 half waves of input

9. The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is
Options
A. VIT
B.
C.
D.

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