11) The main purpose of filling oil in a circuit breaker is :

to produce insulation effect

to stop the ionisation of the surrounding air

to ensure the operation of the device at a low temperature

to suppress the sparking produced across the connector at the time of breaking a circuit.

Answer is:

to suppress the sparking produced across the connector at the time of breaking a circuit.

magnetic

thermal

magnetic and thermal

low voltage

Answer is:

oil circuit breaker (OCB)

miniature circuit breaker (MCB)

air circuit breaker (ACB)

air blast circuit breaker (ABCB)

Answer is:

Magnetic and thermal release

Thermal release

Magnetic release

Low voltage release

Answer is:

frequent tripping of ELCB

electric shock

fire hazard

excessive billing of energy

Answer is: