# Electronics and Communication Engineering - Power Electronics

### Exercise :: Power Electronics - Section 1

41.

The number of leads in an SCR are :

 A. 2 B. 3 C. 4 D. 5

Explanation:

Anode, cathode and gate.

42.

In a single phase full wave converter (M-2 connection) feeding on R - L load, the input voltage is v = Vm sin ωt. The expression for dc output voltage is

 A. B. C. D. Explanation:

Due to inductive load the period of conduction is a to p + a in each half cycle.

43.

A thyristor has a turn on time of 6 μs. If the anode circuit is inductive, the turn on time will be

 A. 6 μs B. less than 6μs C. more than 6 μs D. either 6 μs or less

Explanation:

Inductive load increases the turn on time.

44.

The total number of leads in reverse conducting thyristor is

 A. 2 B. 3 C. 1 D. 4

Explanation: 45.

Assertion (A): A TRIAC is a bidirectional SCR.

Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.

 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