The transfer characteristic of n - p - n - transistor in CE - configuration is shown in the figure. In which of these regions, a transistor is said to be switched off.

Cut off region :- Cutoff mode is the opposite of saturation.A transistor in cutoff mode is off - there is no collector current, and therefore no emitter current. It almost looks like an open circuit. To get a transistor into cutoff mode, the base voltage must be less than both the emitter and collector voltages. Saturation region :- The point where the load line intersects the I B = I B ( sat ) curve is called saturation.At this point, the base current is maximum and so is the collector current. At saturation, collector-base junction no longer remains reverse biased and normal transistor action is lost. Active region :- The region between cut off and saturation is known as active region.In the active region, collector-base junction remains reverse biased while base-emitter junction remains forward biased. Consequently, the transistor will function normally in this region. In region - I , the transistor is said to be switched off. Hence, region - I , is the required answer.

The transfer characteristic of n - p - n - transistor in CE - configuration is shown in the figure. Find the cut-off region, active region and saturation region from it.

Cut off region :- Cutoff mode is the opposite of saturation.A transistor in cutoff mode is off - there is no collector current, and therefore no emitter current. It almost looks like an open circuit. To get a transistor into cutoff mode, the base voltage must be less than both the emitter and collector voltages. Saturation region :- The point where the load line intersects the I B = I B ( sat ) curve is called saturation.At this point, the base current is maximum and so is the collector current. At saturation, collector-base junction no longer remains reverse biased and normal transistor action is lost. Active region :- The region between cut off and saturation is known as active region.In the active region, collector-base junction remains reverse biased while base-emitter junction remains forward biased. Consequently, the transistor will function normally in this region. Here, the region are given as below, I - cut off region II - active region III - saturation region

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The current gain for a transistor working as common-base amplifier is $0.96 .$ If the emitter current is $7.2 mA,$ then the base current is ________

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Important Questions on Semiconductor Devices

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

A circuit is arranged as shown in figure. The output voltage $V_{o}$ is equal to __________ $V .$

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MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

In the following common emitter circuit, $β = 100$ and $V_{CE} = 7 V$ . If $V_{BE}$ is negligible, then the base current is

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EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

For a transistor in CE mode to be used as an amplifier, it must be operated in:

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

In a common emitter amplifier circuit using an

n - p - n

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

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

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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EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

Deduce the relation between the current amplification factors $α$ and $β$ of a transistor.

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

In a common base circuit, collector base voltage changes by

0.6 V

and collector current changes by

0.02 mA .

Then, the output resistance is

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

The transfer characteristic of $n - p - n$ - transistor in $CE$ - configuration is shown in the figure.

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In which of these regions, a transistor is said to be switched off.

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

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 Action and Its Characteristics

The output characteristics of a transistor is shown in the figure. When $V_{CE}$ is $10 V$ and $I_{C} = 4 .0 mA$ , then value of $β_{ac}$ is

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EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

Describe the experimental set up for obtaining output characteristic curve of a $PNP$ transistor in common emitter configuration with suitable circuit diagram. Also draw the curve obtained.

Select possible value of common base current amplification factor $α$ of a transistor among the following.

$0.9, 9, 19, 49 and 99$

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

For a common emitter configuration, if

α

and

β

have their usual meanings, the correct relationship between

α

and

β

is:

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

What is a transistor? Explain with circuit diagram, the working of a transistor as an oscillator.

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

Describe briefly the functions of the three segments of n-p-n transistor.

EASY

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

To use a transistor as an amplifier

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

Explain the working of

n - p - n

transistor as common emitter amplifier with the help of circuit diagram and obtain the formula of voltage gain.

HARD

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

The transfer characteristic of $n - p - n$ - transistor in $CE$ - configuration is shown in the figure.

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Find the cut-off region, active region and saturation region from it.

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

A $n - p - n$ transistor is connected in common emitter configuration in which collector voltage drop across load resistance $(800 Ω)$ connected to the collector circuit is $0.8 V .$ The collector current is

HARD

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

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

MEDIUM

Physics>Modern Physics>Semiconductor Devices>Transistor Action and Its Characteristics

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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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is ________

Important Questions on Semiconductor Devices

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The current gain for a transistor working as common-base amplifier is $0.96 .$ If the emitter current is $7.2 mA,$ then the base current is ________