Relays and Voltage Regulators MCQ - Electrician (Set-1) with Answers

Relays and Voltage Regulators MCQ - Electrician (Set-1) with Answers

1) What will happen when 12 V, 50 Hz A.C. relay is connected to a 12 V D.C. supply ?

Answer is:

The relay draws more current in the absence of inductive reactance, which bruns out the coil

Explanation:

.

2) Starter contacts are indicated either for their position or for their function. In such a case, normally closed contact means that they are

Answer is:

open when the relay coil is energised

3) Which type of relay is used to protect the damage of equipment during under and over voltage fault ?

Answer is:

voltage sensing relay

4) Which type of relays hold their contacts in position even after power is cut off ?

Answer is:

Latching relay

5) Which type of relay is used as time-delay relays ?

Answer is:

Thermal relay