Exercise: Power Electronics

Questions for: Power Electronics

A step up chopper can give an output voltage
A:
higher than input voltage
B:
lower than input voltage
C:
both higher and lower input voltage
D:
all of the above
Answer: A
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In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period
A:
p
B:
a
C:
p - a
D:
Answer: A
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Multiphase choppers are used in
A:
low power circuits
B:
high power circuit
C:
both low and high power circuits
D:
medium power circuits
Answer: B
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Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W

Reason (R): Heat sinks of thyristors are generally made of aluminium.

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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Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor

Reason (R): Transistors are manufactured in very high voltage and current ratings.

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: C
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