Question # 1

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

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

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

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

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Current

Voltage

Power

Heat

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

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

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

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

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

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

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