If 4 quadrant operation is required we need dual converter full converter semi c

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Question
If 4 quadrant operation is required we need
Options
A. dual converter
B. full converter
C. semi converter
D. none of the above

Correct Answer

dual converter

Power Electronics problems

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6. A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be
Options
A. 0.9
B. 0.8
C. 0.75
D. 0.6

7. In a 3 phase full converter, the firing angle is less than 60�. The instantaneous output voltage
Options
A. will have positive part only
B. will have both positive and negative parts
C. may have both positive and negative parts
D. will have negative part if load is inductive

8. As compared to BJT, MOSFET has
Options
A. lower switching losses and higher conduction losses
B. higher switching losses and higher conduction losses
C. higher switching losses and lower conduction losses
D. lower switching losses and lower conduction losses

9. In pulse width modulation of chopper
Options
A. T is kept constant and T_on is varied
B. T_on is kept constant T is varied
C. both T and T_on are varied
D. either T or T_on is varied

10. All other parameters remaining the same, a 3 phase bridge inverter with 180� mode of operation
Options
A. has the same peak thyristor current as in 120� mode of operation
B. has higher peak thyristor current than in 120� mode of operation
C. has lower peak thyristor current than in 120� mode of operation
D. any of the above

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