A 3 phase dual converter consists of two 3 phase semiconverters connected in par

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Question
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

Correct Answer

two 3 phase full converters connected in antiparallel

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2. 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

3. 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

4. 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)

5. In a 3 phase full converter, the instantaneous output voltage can have negative part if
Options
A. firing angle is less than 60�
B. firing angle is less than 90�
C. firing angle is more than 60�
D. firing angle is more than 90�

6. 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

7. 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

9. 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

10. 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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