Question # 1

If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

In the magnetic circuit concept the quantity analogous to electric current in electric circuit analysis is.

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Magnetic flux density

Permeability

Magnetic field intensity

Magnetic flux

The direction of induced e.m.f in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

The basic circuit element is a D.C. circuit is

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An inductor

A resistor

A capacitor

A battery

The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.

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sound wave

Electric fluctuations

Magnetic fluctuations

Signals

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

The value of mutual inductance can be increased by

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Decreasing number of turns in the coil

Increasing number of turns in the coil

Winding the coil on china clay

Winding the coil on wooden frame

Which are the following describe the study of static magnetic fields.

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Electrodynamics

Megnetostatic

Electrostatic

Paraamagnetism

The cathode ray oscilloscope is used for

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Displaying the waveform of given voltage

Displaying the wave form of given vibrations

Rectifying a.c to d.c.

Rectifying D.C. to A.C.

Pure silicon has valence electrons

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1

2

3

4

In L-C parallel circuit the capacitor draws a

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Lagging current

Leading current

Lagging voltage

Leading voltage

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

The capacity of a spherical conductor is numerically equal to its.

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Surface area

Diameter

Radius

Volume

Which law states that magnetization is inversely proportional to temperature for a fixed value fo the field.

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Curie's law

Voltmeter

Ammeter

Wattmeter

The electric field intensity of a point charge varies.

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Directly as the square of the distance from the charge

Directly as the square of the charge

Inversely as teh distance from the charge.

Inversely as the square of the distance from the charge

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

The terminals of a battery are joined by a length of resistance wire Which change on its own will increase the current though the battery.

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Connecting the wire with plastic insulation

Covering the wire with plastic insulation

Using a shorter wire of the same material and the same thickness

Using a thinner wire of the same material and the same thickness

Such an inductor coil which does not consume energy and is often employed for controlling A.C. without consumption of energy is called.

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Reactance

Choke

Impendence

Diode

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

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