Question # 1

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

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

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

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Filter

Amplifier

Resistor

Transistor

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

The output of two input is zero only when its.

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Both inputs are zero

Either input is zero

Both inputs are one

Either input is one

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

The device which are required to convert various physical quantities into electric voltage are called.

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Filters

Rectifiers

Amplifiers

Sensors

Which one has greater cone of impurity among all:

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Emitter

Base

Collector

All are pure

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

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

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

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