Tag: electric generator

Questions Related to electric generator

The device which converts the mechanical energy in to electric energy is

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. D.C. motor

  2. A.C. dynamo

  3. Transformer

  4. Starter

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Correct Option: B
Explanation:

The AC dynamo (generator) is made up of stationary magnets (stator) which create a powerful magnetic field, and a rotating magnet (rotor) which distorts and cuts through the magnetic lines of flux of the stator. When the rotor cuts through lines of magnetic flux it makes electricity. Thus mechanical energy is converted into electrical energy. 

Read the following statements and answer whether the given statement is true or false.


An electric generator works on the principle of electromagnetic induction.

physics effects of electric current electric generator ac generator magnetic effects of electric current

  1. True

  2. False

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Correct Option: A
Explanation:

An electric generator works on the principle of Electromagnetic Induction.

In it, an e.m.f is induced in the coil when the magnetic flux linked with the coil changes.

Hence, the given statement is $True$.

For a dynamo which one of the following statements is correct

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. It converts electrical energy into light energy

  2. It converts kinetic energy into heat energy

  3. It converts mechanical energy into electrical energy

  4. It converts electrical energy into mechanical energy

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Correct Option: C
Explanation:

A  dynamo converts mechanical energy into electrical energy according to Faraday's Law of Electromagnetic Induction.


Answer-(C).

To convert mechanical energy into electrical energy, one can use

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. DC dynamo

  2. AC dynamo

  3. motor

  4. (A) & (B)

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Correct Option: D
Explanation:

Dynamo is a device which converts mechanical energy into electrical energy.

Hence, both DC dynamo and AC dynamo can be used.

Hence, answer is option-(D)

The current produced in a generator armature is AC because

physics effects of electric current electric generator ac generator magnetic effects of electric current

  1. the magnetic field reverses at intervals

  2. The current in the field coils is AC

  3. the rotation of the armature causes the field through it to reverse

  4. the commutator feeds current into it in opposite directions every half cycle

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Correct Option: C
Explanation:

After every half rotation, the direction of e.m.f reverses and hence current changes its direction after a regular interval.

Hence, Answer-(C)