EASY

Earn 100

What are input characteristics of common emitter transistor?

Important Questions on Semiconductor Devices

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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 :

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

Draw the circuit arrangement for studying the output characteristics of n-p-n transistor in CE configuration. Explain how the output characteristics is obtained.

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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

HARD

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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 Characteristics for Different Transistor Configurations

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:

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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?

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

The current gain of a common emitter amplifier is

69

. If the emitter current is

7.0 mA

, collector current is :

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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:

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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 Characteristics for Different Transistor Configurations

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 Characteristics for Different Transistor Configurations

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 :

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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:

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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

Question Image

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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 Characteristics for Different Transistor Configurations

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 Devices>Transistor Characteristics for Different Transistor Configurations

In the study of transistor as an amplifier, the ratio of collector current to emitter current is

0.98

then the ratio of collector current to base current will be

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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}}

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

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

HARD

Physics>Modern Physics>Semiconductor Devices>Transistor Characteristics for Different Transistor Configurations

Draw a neat circuit diagram to study the input and output characteristics of a common emitter transistor.

What are input characteristics of common emitter transistor?

Important Questions on Semiconductor Devices

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