Question # 1

Which of the following quantities is analogous to mass in electricty.

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Charge

Potential

Capacitance

Inductance

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

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

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

A p-type material is formed then a semiconductor is doped with

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Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

A magnetic field is said to exist at a point if

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A force is exerted on a charge placed at that point

A magnetic pole exists at that point

An ampersand current loop surrounds the point

A force not felt by a static charge acts on a moving charge placed at that point

It is sometimes necessary to protect electrical apparatus from magnetic field This can be done by surrounding the apparatus with a box made from.

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Aluminum

Iron

Steel

Rubber

The vertical component of earth's magnetics field is zero.

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At magnetic poles

At geographical poles

At magnetic equator

Everywhere

A 800 W toaster and a 1.3 kW frying pan are plugged into the same 120 V lines, then

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Fuse will not blow

Fuse will blow

Supply will spark

Only toaster can work

The thermionic current increases when

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Area of filament is decreased

Area of filament is increased

Temperature is decreased

Work function is increased

The permeability of air is

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0.5

zero

infinity

Unity

The circuit of full wave rectification consists of

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Only one diode

Two diodes

Three diodes

Four diodes

In a n-type material there is an excess of.

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Free electrons

Holes

Quarks

Measons

They hysteresis losses are eliminated in power transformer by using

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Low resistivity power winding

Low reflectance steel cores

Laminated steel cores

soft iron cores

Which one fo the following is based on the diffraction and repulsion of electric charge.

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Capacitor motor

Transformer

Induction motor

synchronous motor

The permeability of a diamagnetic material is

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Greater than unity

Less than unity

Equal to unity

Zero

A preset or trimmer can be a.

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Variable resistor

Variable capacitor

Variable inductor

All of these

If the source of emf is traversed from negative to positive terminal the potential charge.

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Is negative

Is positive

Is zero

Remain the same

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

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

How the fuse wire in electric supply line is connected to protect the electrical appliances.

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In parallel

In sereis

In mixed order

In vertical position

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