Tag: ac generator

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

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

  1. D.C. motor

  2. A.C. dynamo

  3. Transformer

  4. Starter
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

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


An electric generator works on the principle of electromagnetic induction.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $True$.

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

For a dynamo which one of the following statements is correct

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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


Answer-(C).

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

The current produced in a generator armature is AC because

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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)