Question

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

• A. AC generator has an electromagnet while a DC generator has a permanent magnet.
• B. DC generator will generate a higher voltage.
• C. AC generator will generate a higher voltage.
• D. AC generator has slip rings while the DC generator has a commutator.

Answer 1

The correct option is D

AC generator has slip rings while the DC generator has a commutator.

The explanation for the correct answer:

Option D: AC generator has slip rings while the DC generator has a commutator.

Slip rings are two rings on an alternating current generator. These full rings aid in changing current directions, resulting in AC current.

1. The commutator is made up of two half rings in a DC generator. These half-rings aids in keeping current directions consistent, resulting in DC current.
2. Hence, option D is correct.

The explanation for Incorrect answer(s):

Option A: AC generator has an electromagnet while a DC generator has a permanent magnet.

1. The coil is placed between two permanent magnets with opposite polarities facing each other in both AC and DC generators.
2. Hence, option A is not correct.

Option B: DC generator will generate a higher voltage.

1. DC generators generate a low voltage.
2. Hence, option B is not correct.

Option C: AC generator will generate a higher voltage.

1. The assertion that AC generators generate high voltage is correct.
2. However, this does not distinguish between AC and DC generators.
3. Hence, option C is not correct.

Hence, option D is the correct answer.