Tag: magnetism and electromagnetism

Questions Related to magnetism and electromagnetism

A dynamo converts:

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

  1. electrical energy into mechanical energy

  2. electrical energy into heat energy

  3. mechanical energy into electrical energy

  4. heat energy into electrical energy

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Correct Option: C
Explanation:

A dynamo converts mechanical energy into electrical energy.

Electric generator ____________.

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

  1. Converts electric energy into magnetic energy.

  2. Converts electric energy into mechanical energy.

  3. Converts mechanical energy into electrical energy.

  4. Converts magnetic energy into electrical energy.

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Correct Option: C
Explanation:

An electric generator is a machine which generates electricity by using the principle of EMI. It converts mechanical energy into electrical energy.

Electric generator (Dynamo) generates electricity by using the principle ______.

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

  1. electric circuit

  2. magnetic field

  3. electromagnetic induction

  4. none

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Correct Option: C
Explanation:

Electric generator (Dynamo) generates electricity by using the principle electromagnetic induction
The generator/dynamo 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.

Dynamos is a device that _______.

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

  1. reduces electric power

  2. generates electricity

  3. step down the voltage

  4. the voltage

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Correct Option: B
Explanation:

An electric generator (Dynamo) is a machine which generates electricity by using the principle of electromagnetic induction.

There is no ________ in AC generator.

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

  1. ship rings

  2. electromagnets

  3. commulator

  4. generator coil

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Correct Option: C
Explanation:

There is no commutator in AC generator. In DC generator, we connect the two ends of the coil to the commutator consulting two half rings of copper.

In large powerhouse generator, the ________ are stationary and the _______ rotates

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

  1. electromagnets and coils respectively

  2. induces and commutator respectively

  3. coils and electromagnet respectively

  4. commutators and inducer respectively

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Correct Option: C
Explanation:

The power house AC generators have a fixed site of coil arranged around a relating electromagnet. Thus, in large power house generators, the coils are stationary are the electromagnet rotates.

________ are used in making electric generators and electric motors.

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

  1. electric current

  2. magnetes

  3. cables

  4. all

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Correct Option: B
Explanation:

Magnets are also used in making electric generators and electric motors. Magnetic resources imagine also use magnets

A small generator is called a _______.

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

  1. AC generator

  2. DC generator

  3. Dynamo

  4. All

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Correct Option: C
Explanation:

A small generator is called or dyanamo. Ex. Dynamo are used in bicycles for lighting purposes.

The major differences between an electric motor and generator are stated below

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

  1. the generator converts mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.

  2. the generator converts electrical energy into mechanical energy while motor converts mechanical energy into electrical energy.

  3. both

  4. none

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Correct Option: C
Explanation:

Electric Motor
1. It converts electrical energy into mechanical energy.
2. It needs electrical energy for its working.
3. They are used as water pumps, marble grinders e.t.c Generator
1. It converts mechanical energy into electrical energy
2. It needs mechanical energy for its working.
3. They are used as water pumps, marble grinders e.t.c
3. Diesel generator, hydro-electric generator are the examples of it.

Dynamo produces

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

  1. Direct Current

  2. Alternating current

  3. DC + AC

  4. None

Show answer
Correct Option: A
Explanation:

Dynamo produces Direct current by process of commutation.