Question # 1

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

A diode characteristic curve is a plot between

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse voltage

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

A transistor has:

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Two regions

Three regions

Single regions

Four regions

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

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

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Filter

Amplifier

Resistor

Transistor

The circuit of full wave rectification consist of

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Three diodes

Four diodes

Two diodes

One diode

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

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