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When a transistor is used as a Switch, it operates in the

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Important Questions on Semiconductor Devices

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

Transfer characteristics [output voltage

(V_{0})

vs input voltage

(V_{i})

] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

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Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

For common emitter transistor amplifier, the audio signal voltage across the collector resistance of

2 k Ω

4 V.

If the current amplification factor of the transistor is

100

and the base resistance is

1 k Ω

then the input signal voltage is

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

For a transistor,

α_{d c}

and

β_{d c}

are the current ratios, then the value of

\frac{β_{d c} - α_{d c}}{α_{d c} \cdot β_{d c}}

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Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.

Assertion(A) : $n - p - n$ transistor permits more current than a $p - n - p$ transistor.

Reason(R) : Electrons have greater mobility as a charge carrier.

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

In a common-emitter transistor amplifier, the audio signal voltage across the collector is

3 V.

The resistance of collector is

3 kΩ

. If current gain is

100

and the base resistance is

2 kΩ

, the voltage and power gain of the amplifier is

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

In a common emitter amplifier circuit using an

n - p - n

transistor, the phase difference between the input and the output voltages will be:

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

The ratio (R) of output resistance

r_{0},

and the input resistance

r_{i}

in measurements of input and output characteristics of a transistor is typically in the range :

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Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

A NPN transistor is connected in common emitter configuration in a given amplifier. A load resistance of

800 Ω

is connected in the collector circuit and the voltage drop across it is

0 .8

V

. If the current amplification factor is

0.96

and the input resistance of the circuit is

192 Ω

, the voltage gain and the power gain of the amplifier will respectively be:

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Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

In the figure, given that $V_{B B}$ supply can vary from $0$ to $5.0 V, V_{C C} = 5 V, β_{d c} = 200,$ $R_{B} = 100 kΩ,$ $R_{C} = 1 kΩ$ and $V_{B E} = 1.0 V.$ The minimum base current and the input voltage at which the transistor will go to saturation, will be, respectively:

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EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

For a common emitter configuration, if

α

and

β

have their usual meanings, the correct relationship between

α

and

β

is:

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

The transfer characteristics for a transistor in $C E$ mode is as shown in figure. To use transistor as a switch, it should be used in

Question Image

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

An unknown transistor needs to be identified as a

n p n

p n p

type. A multimeter, with +ve and -ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a

p n p

transistor?

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Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

The current gain of a common emitter amplifier is

69

. If the emitter current is

7.0 mA

, collector current is :

HARD

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is :

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor as a Switch