Question # 1

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

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

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

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Zero current

Maximum current

Minimum current

Steady average current

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

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 device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

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

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable 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

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

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Physics FSC Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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