Question # 1

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

The potential difference across the depletion region of germanium is.

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0.3 V

0.5 V

0.7 V

0.8 V

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

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 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 mathematical symbol for NOR operation is

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X = A . B

X = A + D

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

For automatic Switching of streetlight, the op amplifier is used as.

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Inductor

Converter

Comparator

Thermistor

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

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

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An oscillator

Detector

An amplifier

Rectifier

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

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1

2

3

4

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

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