Q4 of 39 Page 240

The essential difference between an AC generator and a DC generator is that:

The main difference between an AC generator and a DC generator is the commutator. An AC generator has slip rings while the DC generator has a commutator. Thus, option (d) is correct option.

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2

The phenomenon of electromagnetic induction is:

 3

The device used for producing electric current is called a:

 5

At the time of short circuit, the current in the circuit:

 6

State whether the following statements are true or false:

(a) An electric motor converts mechanical energy into electrical energy.


(b) An electric generator works on the principle of electromagnetic induction


(c) The field at the centre of a long circular coil carrying current will be parallel straight lines


(d) A wire with a green insulation is usually the live wire of an electric supply