Question # 1

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Commutator was invented in

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1834

1820

1840

1835

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

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

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

Unit of self inductance is

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Weber

Tesla

Henry

Farad

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

Self inductance of a long solenoid is given by

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None of the above

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

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

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