Question # 1

During negative half cycle of A.c then p-n junction offers.

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High resistance

Low resistance

No resistance

All of these

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

The symbol of p-n-p transistor is

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Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

The device which are required to convert various physical quantities into electric voltage are called.

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Filters

Rectifiers

Amplifiers

Sensors

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

For rectification we use.

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Transformer

Diode

Choke

Generator

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

Improper bisting of a transistor circiut produces:

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Heavy loading of emitter current

Distortion in the output output signal

Excessive heat at collector terminal

Faculty location of load line

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