Question # 1

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

The circuit of full wave rectification consist of

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Three diodes

Four diodes

Two diodes

One diode

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

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

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

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

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1

2

3

4

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

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

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

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

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Inductor

Converter

Comparator

Thermistor

Truth table of logic function.

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Summarize its output values only

Tabulates all its input conditions only

Display all its input and output possibility

Is not base on logic algebra

Which one has greater cone of impurity among all:

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Emitter

Base

Collector

All are pure

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

In full wave rectification number of diodes required are equal to.

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2

3

4

5

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