Electric Generator

Q.

An electric generator works on the principle of ___.

1. Electromagnetic induction
2. Force on a current carrying conductor
3. Joule’s heating effect
4. Friction

Q. The current that changes direction continuously is known as ___ current.

Q. The arm of an electric generator with split rings is rotated in clockwise direction. The deflection of the galvanometer will _______.

1. be towards left
2. be towards right
3. oscillates between left and right.
4. Can not be determined

Q.

When a coil is rotated in a magnetic field and is connected to a circuit using slip rings, the direction of current in the circuit:

1. There will be no current
2. Is constant
3. Changes continuously
4. Cannot be predicted

Q. The primary coil of a transformer connected to an AC supply of 320 volts contains 500 turns, while the secondary coil has 200 turns. What will be the voltage at the secondary coil ?

1. 640 volts
2. 728 volts
3. 800 volts
4. 128 volts

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

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

Q. AC generator will have ___ rings.

Q. Alternating current has a constant direction.

1. True
2. False

Q. Which of the following statements are true?

1. AC generator supplies direct current.
2. DC generator has a commutator.
3. DC generator supplies alternating current.
4. AC generator has slip rings.

Q.

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

1. AC generator has an electromagnet while a DC generator has permanent magnet.

2. AC generator has split rings while DC generator has slip rings.

3. AC generator has slip rings while DC generator has split rings.

4. AC generator will generate a higher voltage.