Question # 1

DC generator by william Sturgeon in:

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1894

1961

1834

1961

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Lenz's law presented in

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1834

1934

1826

1836

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

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