Electronics and Communication Engineering - Power Electronics

1. 

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: Option A

Explanation:

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2. 

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: Option D

Explanation:

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3. 

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: Option A

Explanation:

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4. 

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: Option B

Explanation:

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5. 

In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th1 and Th2 respectively are

A. 0 to p and p to 2p
B. a to p and p + a to 2p
C. a to p + a and p + p to 2p + a
D. a to p - a and p + a to 2p - a

Answer: Option C

Explanation:

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