51) The purpose of the fusible plug fitted on the top of the water heater casing is to

disconnect the supply of electricity in case of short circuit

release the pressure inside the tank in case of thermostat failure

release the steam inside the heater in case of over heat

eject the three pin plug so as to disconnect the supply in case of earth fault

Answer is:

disconnect the supply of electricity in case of short circuit

1 kW

2 kW

3 kW

4 kW

Answer is:

It supports the heating element in one position

It reduces the heat loss

It holds the sole plate in position

It keeps the heat uniformly

Answer is:

Pulsator (disc) type

Agitator type

Tumbler type

Turbulance jet type

Answer is:

Ordinary without timer type

Ordinary with timer type

Semi-automatic type

Automatic type

Answer is: