Question # 1

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

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

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1931

1731

1842

1831

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

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

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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

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Carbon burshes

Coil

Commutator

Magnetic field

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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 back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Self inductance of a long solenoid is given by

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None of the above

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

Lenz's law presented in

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1834

1934

1826

1836

Commutator was invented in

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1834

1820

1840

1835

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