Question # 1

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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high - low

yes - no

on - off

0 - 1

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

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