The turn on characteristics of a power transistor can be assumed to be linear, a

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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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1. 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

3. 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

4. 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

5. 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

9. Assertion (A): A DIAC has four layers but only two terminals.
Reason (R): A DIAC can conduct in both directions.
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

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