Question # 1

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

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

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Armature

Magnet

Slip rings

Commutator

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

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Lenz's law

Faraday's law

Ampere's law

None of these

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 magnitude of motional emf is given by

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When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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