Question # 1

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

Commutator was invented in

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1834

1820

1840

1835

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

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

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Armature

Magnet

Slip rings

Commutator

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

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

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

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

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Copper

Silicon

Iron

Aluminum

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

DC generator by william Sturgeon in:

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1894

1961

1834

1961

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

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