Question # 1

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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

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Armature

Magnet

Slip rings

Commutator

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

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

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

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

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

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Current

Voltage

Power

Heat

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

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' s1ast rule

Lenz's law presented in

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1834

1934

1826

1836

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 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

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

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

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

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Zero current

Maximum current

Minimum current

Steady average current

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Unit of self inductance is

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Weber

Tesla

Henry

Farad

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

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