Exercise: Power Electronics

Questions for: Power Electronics

A single phase semiconverter is feeding a highly inductive load and has a freewheeling diode across the load. The waveshape of input current is
A:
sinusoidal
B:
rectangular
C:
sinusoidal or rectangular
D:
triangular
Answer: B
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The total number of leads in SCR, DIAC and TRIAC respectively are
A:
3, 2, 3
B:
2, 3, 3
C:
3, 3, 2
D:
3, 2, 4
Answer: A
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Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired.

Reason (R): A thyristor can conduct only when it is forward biased.

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: D
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In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of
A:
120°
B:
60°
C:
240°
D:
any of the above
Answer: A
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Which chopper circuit operates in quadrants 1 and 4?
A:
A
B:
B
C:
D
D:
E
Answer: C
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