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Power Electronics problems

3. Assertion (A): A dual converter may be circulating current type or non circulating current type.
Reason (R): In circulating current dual converter only one converter can be operated at one time.
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

4. The two modes of operation of three phase bridge inverters are known as
Options
A. 60� mode and 120� mode
B. 90� mode and 120� mode
C. 120� mode and 180� mode
D. 120� mode and 240� mode

5. A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to
Options
A. one half wave of output
B. one full wave of output
C. two full waves of output
D. either (b) or (c)

6. The number of doped regions in a SCR is
Options
A. 2
B. 3
C. 4
D. 5

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8. In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be
Options
A. 30 A
B. 152 A
C. 15 A
D.

9. If t_on and t_off are the turn on and turn off times of a thyristor, then
Options
A. t_on and t_off are almost equal
B. t_on >> t_off
C. t_off >> t_on
D. t_on is about twice t_off

10. In 180� mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.
Options
A. True
B. False

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