Question # 1

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

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

the number of terminals in a semiconductor diode are

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2

3

4

5

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

The circuit of full wave rectification consist of

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Three diodes

Four diodes

Two diodes

One diode

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

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

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An oscillator

Detector

An amplifier

Rectifier

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

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Widened

Narrowed

Normal

None of these

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

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)

For rectification we use.

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Transformer

Diode

Choke

Generator

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

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1

2

3

4

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

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