Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): The output voltage of an inverter can be controlled by PWM technique

Reason (R): In a current source inverter the input current is constant.

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 load commutated chopper circuit has
A:
one thyristor
B:
two thyristors
C:
four thyristors
D:
six thyristors
Answer: C
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Lead mounting for SCR is used for
A:
rating less than mA
B:
rating about 1 A or less
C:
rating of 20 A or less than 20 A
D:
rating 100 A or less
Answer: B
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In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to
A:
2Ir
B:
2 Ir
C:
Ir
D:
Answer: B
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A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency
A:
must be a sub-multiple of input frequency
B:
can be any frequency
C:
must be an even sub-multiple of input frequency
D:
must be an odd sub-multiple of input frequency
Answer: A
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