Question # 1

A D.C Motor converts

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

When X_c = X_l, this condition is called.

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Equality

Balanced

Resonance

Equlibrium

On which factor the self induction does not depends upon.

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Number of turns of the coil

the core material

Weight of the coil

Area of the cross section of the coil

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

In a charged capacitor the energy resides

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In the negative plate

In the positive plate

In the field between the plates

Around the edge of the plates

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

The building up of electric charge on the surface of objects is termed as.

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Static electricity

Electric charge

Electric current

Electrostatic induction

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

How the small bulbs used for decoration purposes are connected.

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In parallel

In series

In mixed order

In vertical position

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

Coulomb found that the mutual force between tow electric charges varies.

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Inversely as the distance

Inversely as the square of the distance

directly as the distance

Directly as the distance squared

One volt is equal to.

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One joule per coulomb

One dyne per coulomb

One newton per coulomb

One watt second

Electrical energy is transmitted at high alternating voltages which of the following is not a valid reason for doing this.

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At high voltage a.c is safer than d.c.

For a given powers, there is lower current with higher voltage.

There is a smaller energy loss at high voltage and lower current

The transmission lines can be thinner with a lower current.

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

Which field is produced by electric charge on a body at rest.

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Electric field only

Magnetic field only

Neither electric nor magnetic field

Both electric and magnetic fields

A generator running in reverse may be called as.

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A.C. Generator

D.C. generator

Motor

Commutator

In the circult, the ammeter reading is 0.5 A . If the resistance of the voltmeter is 180Ohm What is the voltmeter rediang.

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90 V

100 V

180 V

900 V

Which of the following is the ability to hold an electric charge in electromagnetism.

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Resistance

Impedance

Inductance

Capacitance

The field inside a hollow spherical conductor is.

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Constantin zero

Constant but not necessarily zero

A function of charge on sphere

a function of distance from the centre

In electronegative waves the electric and magnetic fields are.

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Parallel to each other

Perpendicular to each other

antiparallel to each other

At an angle of 45 ^o to each other

The ratio of the magnitude of charge on one of the two conductors in proximity to the potential difference between the two is called.

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Inductance

Reactance

Resistance

Capacitance

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