In a 3 phase full converter, the instantaneous output voltage can have negative

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Question
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�

Correct Answer

firing angle is more than 60�

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2. In thermal ohm's law, temperature and power loss are analogous to
Options
A. V and I respectively of ohm's law
B. I and V respectively of ohm's law
C. R and V respectively of ohm's law
D. I and R respectively of ohm's law

5. In a parallel inverter
Options
A. each thyristor is turned on twice during each cycle
B. each thyristor is turned on once during each cycle
C. each thyristor is turned on either once or twice in each load cycle
D. each thyristor may be turned on upto four times in each load cycle

6. 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)

7. 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

8. 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

10. 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

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