AC Generator

Q.

The rotating part of an electric generator is termed as ____.

1. brushes

2. armature

3. rotor

4. field magnet

Q.

An electric generator works on the principle of ___.

1. electromagnetic induction

2. force on a current carrying conductor

3. friction

4. Joule’s heating effect

Q.

Which position of the coil in the magnetic field gives maximum emf?

1. 

2. 

3. 

4. 

Q.

What is the energy transformation in a moving coil microphone?

1. Heat energy to Sound energy

2. Sound energy to Electrical energy

3. Sound energy to Light energy

4. Electrical energy to Sound energy

Q.

An electric generator is a device which works on the principle of electromagnetic induction.

1. True

2. False

Q.

The arm of an electric generator with split rings is rotated clockwise. Then the deflection of the galvanometer will be ___

1. towards left.

2. towards right.

3. no deflection.

4. shifting between left and right.

Q. The current produced by a generator with slip rings will have which of the following current variations with time as output ?

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2

Q.

In the figure given below, a coil is placed between two permanent magnets and is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represents two metallic brushes. G represents galvanometer.

In the given setup, if the axle moves with constant speed the current through the arm AB and CD :

1. flows in the same direction always.

2. reverses direction periodically.

3. reverses direction non-periodically.

4. keeps increasing.

Q.

An armature consists of an arrangement of insulated copper wires wound around a soft iron core.

1. True

2. False
   

Q. Slip rings are full rings fused to the ends of the _____, which rotate about the same axis as that of the armature.

1. armature coil
2. brushes
3. field magnet
4. load