Question # 1

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 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

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

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

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All 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

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

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

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

Unit of self inductance is

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Weber

Tesla

Henry

Farad

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