Electronics and Communication Engineering - Power Electronics

41. 

The number of leads in an SCR are :

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

Answer: Option B

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.

Answer: Option C

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

Answer: Option C

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

Answer: Option B

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

Answer: Option A

Explanation:

Since a TRIAC can conduct in both directions it is bi directional SCR.