Question # 1

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

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 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

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

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

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Inductor

Rectifier

Comparator

emf

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

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

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2

3

4

5

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

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

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1

2

3

4

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

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

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Inductor

Converter

Comparator

Thermistor

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

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