Semiconductors MCQs (Chapterwise Multiple Choice Questions)

Which type of element is most widely used for the manufacture of semiconductor devices?

Group IV

Group V

Group III

Group VI

Answer & Explanation

Correct Answer: Group IV

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On a circuit board what letter usually marks a transistor?

L

Q

T

R

Answer & Explanation

Correct Answer: Q

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Which of the following conditions must a transistor fulfill to act as an amplifier?

Base-emitter junction reverse biased and base-collector junction forward biased

Base-emitter junction forward biased and base-collector junction reverse biased

Emitter-collector junction forward biased and base- collector junction reverse biased

Base-collector junction forward biased and emitter-collector junction reverse biased

Answer & Explanation

Correct Answer: Base-emitter junction forward biased and base-collector junction reverse biased

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What would be the gain of a negative feedback amplifier with an internal gain A=100 and a feedback factor m=0.9?

1.09

12

5.5

7

Answer & Explanation

Correct Answer: 1.09

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In the collector feedback biasing, β = 57 , RC = 1 kΩ , IB = 60µA and VCB = 4.5V. The value of the stability factor will be _____.

30.4

32.9

57

4.5

Answer & Explanation

Correct Answer: 32.9

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When a transistor is driven to saturation, ideally, the Vce is _____.

VCC

VCC/2

0

2VCC

Answer & Explanation

Correct Answer: 0

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Which two formulas determine the carrier distribution of a semiconductor?

Fermi-Dirac distribution & density of states

Ohm's law & Kirchhoff's current law

Riemann zeta function & Fourier transform

Bose-Einstein distribution & Bessel functions

Answer & Explanation

Correct Answer: Fermi-Dirac distribution & density of states

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The Q-factor of a parallel tuned circuit is given by _____.

1/R√C/L

R√L/C

1/R√L/C

R√C/L

Answer & Explanation

Correct Answer: 1/R√L/C

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The required gain of an amplifier for sustained oscillation in the wein bridge oscillator is _____.

A 2

A 1

A 3

None of the above

Answer & Explanation

Correct Answer: A 3

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What is the bandgap of silicon?

1.12 eV

1.41 eV

2.83 eV

0.79 eV

Answer & Explanation

Correct Answer: 1.12 eV

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