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Test: BJT Configuartion - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test Analog Circuits - Test: BJT Configuartion

Test: BJT Configuartion for Electronics and Communication Engineering (ECE) 2024 is part of Analog Circuits preparation. The Test: BJT Configuartion questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: BJT Configuartion MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: BJT Configuartion below.
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Test: BJT Configuartion - Question 1

For a BJT, for common base configuration the input characteristics are represented by a plot between which of the following parameters?

Detailed Solution for Test: BJT Configuartion - Question 1

The input signal is applied between the base and the emitter terminals. Input current flowing is the base current and hence characteristics are represented by a plot between VBE and IB.

Test: BJT Configuartion - Question 2

In a BJT, if the collector-base junction is reverse-biased and the base-emitter junction is forward-biased, which region is the BJT operating in?

Detailed Solution for Test: BJT Configuartion - Question 2

If the collector-base junction is reverse-biased and the base-emitter junction is forward-biased, then the BJT functions in the active region of the output characteristics.

Test: BJT Configuartion - Question 3

In a BJT, if the collector-base junction and the base-emitter junction are both reverse-biased, which region is the BJT operating in?

Detailed Solution for Test: BJT Configuartion - Question 3

If the collector-base junction and the base-emitter junction are both reverse-biased, then the BJT functions in the cutoff region of the output characteristics.

Test: BJT Configuartion - Question 4

From the given characteristics, what is the approximate value of IC at VBE=0.7 V and VCE=15 V?

Detailed Solution for Test: BJT Configuartion - Question 4

From the characteristics, the value of IB at VBE=0.7V is 20uA. Now, from IB=20 uA, we get IC = 2.5 mA.

Test: BJT Configuartion - Question 5

For a BJT, for common base configuration the output characteristics are represented by a plot between which of the following parameters?

Detailed Solution for Test: BJT Configuartion - Question 5

The input signal is applied between the collector and the emitter terminals. Input current flowing is the collector current and hence characteristics are represented by a plot between VCE and IC.

Test: BJT Configuartion - Question 6

In a BJT, if the collector-base junction is forward-biased and the base-emitter junction is forward-biased, which region is the BJT operating in?

Detailed Solution for Test: BJT Configuartion - Question 6

If the collector-base junction and the base-emitter junction are both forward-biased, then the BJT functions in the saturation region of the output characteristics.

Test: BJT Configuartion - Question 7

Which of the following correctly determines the relation between α and β?

Detailed Solution for Test: BJT Configuartion - Question 7

α and β are related as β = α/(1 - α).
In a BJT, β = IC/IB. and α = IC/IE
β = αIE/IB = (1+β)α
β = α + αβ
β = α/1 - α.

Test: BJT Configuartion - Question 8

For common emitter configuration, which of the following is the correct relation?

Detailed Solution for Test: BJT Configuartion - Question 8

All the relations hold true i.e. IC = βIB and IC = αIE. As α<1, hence IC < IE.

Test: BJT Configuartion - Question 9

In a pnp-BJT, when the E-B junction is forward biased and no voltage is applied across C-B junction, what happens to the width of the depletion region in the E-B junction?

Detailed Solution for Test: BJT Configuartion - Question 9

On application of a forward bias voltage across E-B junction, the width of the depletion region decreases.

Test: BJT Configuartion - Question 10

Which of the following statements is true about proper functioning of a BJT?

Detailed Solution for Test: BJT Configuartion - Question 10

In a BJT, depending upon the biasing of the two junctions, the BJT behaves differently. The BJT may be in saturation, wherein it acts like a short circuit, or it may be in cut-off, i.e an open circuit. The BJT can be either in forward active or reverse active mode. Active mode is the common mode, used in BJTs and obtained by one forward biased and one reverse biased junction.

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