Electrical Engineering XYZ MCQs
A DC generator without commutator is essentially a:
- Induction motor
- AC generator
- DC generator
- DC motor
Correct answer: 2. AC generator
Explanation: A DC generator without a commutator essentially becomes an AC (alternating current) generator. The commutator is a crucial component in a DC generator, responsible for converting the alternating current induced in the armature coils into direct current. Without a commutator, the generated current would remain alternating.
Therefore, if a DC generator lacks a commutator, it cannot effectively convert the induced alternating current into direct current, and it essentially operates as an AC generator. The options provided can be eliminated based on this explanation:
- Induction motor: An induction motor operates on the principle of electromagnetic induction to produce rotational motion, and it does not involve the generation of direct current.
- DC generator: This option is incorrect because the question specifically mentions a DC generator without a commutator, which implies that it cannot function as a typical DC generator.
- DC motor: A DC motor converts electrical energy into mechanical motion, and it is not designed for the generation of electrical power like a generator.