Exercise: Power Electronics

Questions for: Power Electronics

A single phase full bridge inverter for R-L loads needs
A:
4 thyristors
B:
4 thyristors and 4 diodes
C:
4 thyristors and 2 diodes
D:
8 thyristors
Answer: B
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In a cycloconverter it is possible to vary
A:
only output frequency
B:
only output voltage
C:
both output voltage and frequency but not simultaneously
D:
both output voltage and output frequency simultaneously
Answer: D
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A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively
A:
B:
C:
D:
Answer: B
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In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
A:
36
B:
18
C:
12
D:
8
Answer: C
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A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
A:
will be less than 100 N-m
B:
will be more than 100 N-m
C:
may be more or less than 100 N-m depending on motor parameters
D:
very small
Answer: B
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