DOMESTIC APPLIANCES - Practice Mode

1) Which material is used to make heating element?

Silver Copper Nichrome Aluminium

Correct Answer: Nichrome

Explanation:

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2) What is the function of stirrer motor in micro wave oven?

Draws cooling air inside Spreads the heat uniformly Exhausts the hot air outside Revolves and reflects the electromagnetic energy

Correct Answer: Revolves and reflects the electromagnetic energy

3) Which type of A.C single phase motor is used in food mixer?

Universal motor Repulsion motor Split phase motor Shaded pole motor

Correct Answer: Universal motor

4) Which formula is used to calculate the heat generated as per Joules law?

Heat generated = IRT / J cal Heat generated = I<sup>2</sup>RT / J cal Heat generated = IR<sup>2</sup>T / J cal Heat generated = (IR)<sup>2</sup> T / J cal

Correct Answer: Heat generated = I<sup>2</sup>RT / J cal

5) Calculate the heat generated in a electric heater of 1000 watt, 240 volt, worked for 5 minutes?

70.5 Kilo calories 71.0 Kilo calories 71.6 Kilo calories 72.1 Kilo calories

Correct Answer: 71.6 Kilo calories

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