Question # 1

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

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

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

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

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

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

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

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

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

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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