Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): A dual converter may be circulating current type or non circulating current type.

Reason (R): In circulating current dual converter only one converter can be operated at one time.

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

In circulating current dual converter both converters operate together.

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In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is
A:
0 ≤ a ≤ 180°
B:
0 ≤ a ≤ 150°
C:
0 ≤ a ≤ 120°
D:
0 ≤ a ≤ 90°
Answer: B

Since output voltage is zero if a ≥ 150°, the possible range of firing angles is 0 ≤ a ≤ 150°.

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A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is
A:
zero
B:
about 1 V
C:
same as input voltage
D:
twice the input voltage
Answer: C

Before triggering the whole of applied voltage is across SCR and load current is zero.

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In integral cycle control the period of on-off control should be more than mechanical time constant of load.
A:
True
B:
False
C:
D:
Answer: B

It should be less than mechanical time constant.

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Two semiconverters are connected in series to form a single phase series converter. The input v = Vm sin ωt and a1 = a2 are the firing angles of the two converters. If a1 = a2 = 0, the dc output voltage is
A:
B:
C:
D:
Answer: C

Output voltage is for each.

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