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The correct circuit for a pnp transistor amplifier in common emitter configuration :-

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Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

A transistor is used as a common emitter amplifier with a load resistance of

2 k Ω

. The input resistance is

150 Ω

. Base current is changed by

20 μ A

which results in a change in collector current by

1.5 m A

. The voltage gain of the amplifier is

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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}}

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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 Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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 Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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:

Question Image

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

For a common emitter configuration, if

α

and

β

have their usual meanings, the correct relationship between

α

and

β

is:

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

The current gain of a common emitter amplifier is

69

. If the emitter current is

7.0 mA

, collector current is :

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

NPN

transistor operates as a common emitter amplifier, with a power gain of

60 d B

. The input circuit resistance is

100 Ω

and the output load resistance is

10 k Ω

. The common emitter current gain

β

is:

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

The input signal is given to a CE amplifier having a voltage gain of

150

V_{i} = 2 \cos (15 t + \frac{π}{3})

. The corresponding output signal will be:

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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

HARD

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

In a common emitter configuration with suitable bias, it is given that

R_{L}

is the load resistance and

R_{B E}

is small-signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by:

β

is current gain,

I_{B}

I_{C}

and

I_{E}

are respectively base, collector, and emitter currents.

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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 Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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 :

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

A common emitter amplifier circuit, built using an NPN transistor, is shown in the figure. Its dc current gain is

250

R_{C} = 1 kΩ

and

V_{C C} = 10 V

. The minimum base current for

V_{C E}

to reach saturation is

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

The transfer characteristic curve of a transistor, having input and output resistance $100 Ω$ and $100 k Ω$ respectively, is shown in the figure. The voltage and power gain, are respectively:
Question Image

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

N P N

transistor is used in common emitter configuration as an amplifier with

1 k Ω

load resistance. Signal voltage of

10 m V

is applied across the base-emitter. This produces a

3 m A

change in the collector current and

15 μ A

change in the base current of the amplifier. The input resistance and voltage gain are:

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

In a common emitter amplifier circuit using an

n - p - n

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

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

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:

HARD

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Junction Transistor

In the circuit shown in the figure, the input voltage

V_{i} is 20 V, V_{B E} = 0 and V_{C E} = 0

. The values of

I_{B}, I_{C} and β

are given by

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The correct circuit for a pnp transistor amplifier in common emitter configuration :-

Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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