Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): A class C chopper can operate in first and second quadrants

Reason (R): A class B chopper operates only in second quadrant.

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
Answer: B
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A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is
A:
B:
C:
D:
Answer: A
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In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
A:
1
B:
2
C:
3
D:
4
Answer: B
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The duty cycle of a step down chopper is
A:
B:
C:
D:
Answer: A
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A single phase cycloconverter with centre tapped input transformer requires
A:
2 thyristors
B:
4 thyristors
C:
8 thyristors
D:
either 2 or 4 thyristors
Answer: B
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