Typical values of for an SCR are in the range of 1 to 10 25 to 500 0.1 to 1 1000

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Question
Typical values of for an SCR are in the range of
Options
A. 1 to 10
B. 25 to 500
C. 0.1 to 1
D. 1000 to 2000

Correct Answer

25 to 500

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2. 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.

3. 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

5. 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

7. 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

10. A string of series connected thyristors needs equalising circuit to
Options
A. ensure proper firing
B. ensure proper current division
C. ensure proper voltage division
D. none of the above

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