Question # 1

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

Which of the following are sources of direct current.

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Batteries

Solare cells

Thermocouples

All of these

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

Charge to mass ration of an electron is determined by using the relation.

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e/m = B/rv

e/m = r/vB

e/m = V/Br

e/m = v/r

The negative of the potential gradient is

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Potential energy

Electrostatic force

Electric field intensity

Electromotive force

Eddy current can be minimized by

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Moving the conductor rapidly

Moving the conductor slowly

Using a metallic core

Using a laminated core

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

Which incapability of the materials is represented by the phenomenon of hysteresis.

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Magnetic saturation

Low susceptibility

Retrace the path

Orientation

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

By placing soft iron inside a coil

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Increases the magnetic flux

Decreases the magnetic flux

Creates no change in magnetic flux

Decreases the diameter of the core

Which material has the highest magnetic susceptibility.

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Steel

Brass

Iron

Wood

For an A.C. circuit the power factor is

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Always les than one

Always greater than one

Always equal to one

Absent

The core of a transfer is made of iron because

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Iron is a good electric material

Iron is cheaper than copper

Iron is easily magnetized and demagnetized

Iron makes a good permanent magnet

What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.

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4.8 W

14.5 W

30 W

60 W

The current passing across a p-n junction due to minority charge carriers is called

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Reverse current

Forward current

Leakage current

Both a and b

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

What for is a modulator circuit used.

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To eliminate carrier waves

To superpose the radio frequency signal on the carrier waves

To transmit the signal

To create sound waves

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