Electronic Devices And Circuits MCQ Questions & Answers

1

A thin P-type silicon sample is uniformly illuminated with light which generates excess carriers. The recombination rate is directly proportional to

A) The minority carrier mobility B) The minority carrier recombination lifetime C) The majority carrier concentration D) The excess minority carrier concentration

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Answer & Solution

Answer: Option D

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2

As the Fermi energy of silver is 8.8 × 10^-19 joule, the velocity of the fastest electron in silver at 0°K (Given: Rest mass of electron = 9.1 × 10^-31 kg) is

A) 3.33 × 10⁵ m/s B) 1.39 × 10⁶ m/s C) 4.40 × 10⁷ m/s D) 3 × 10⁸ m/s

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Answer & Solution

Answer: Option B

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3

The intrinsic carrier concentration of silicon sample at 300 K is 1.5 × 10¹⁶/m³. If after doping, the number of majority carriers is 5 × 10²⁰/m³, the minority carrier density is

A) 4.50 × 10¹¹/m³ B) 3.33 × 10⁴/m³ C) 5.00 × 10²⁰/m³ D) 3.00 × 10^-5/m³

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Answer & Solution

Answer: Option A

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4

How many layers of material does a transistor have?

A) 4 B) 3 C) 2 D) 1

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Answer & Solution

Answer: Option B

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5

In JFET, when operated above the pinch-off voltage, the

A) Depletion region becomes smaller B) Drain current starts decreasing C) Drain current remains practically constant D) Drain current increases steeply

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Answer & Solution

Answer: Option C

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6

In an intrinsic semiconductor, breaking of a covalent bond results in the generation of:

A) An electron in the conduction band and a hole in the valence band B) An electron in the valence band and a hole in the conduction band C) An electron and a hole in the conduction band D) An electron and a hole in the valence band

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Answer & Solution

Answer: Option A

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7

Depletion type MOSFET operates in:

A) Depletion Model only B) Enhancement Mode only C) Both depletion and enhancement mode D) None of the above

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Answer & Solution

Answer: Option C

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8

What current does $${\text{I}} = {\text{Aq}}\left( {\frac{{{{\text{D}}_{\text{P}}}}}{{{{\text{L}}_{\text{P}}}{{\text{N}}_{\text{D}}}}} + \frac{{{{\text{D}}_{\text{n}}}}}{{{{\text{L}}_{\text{n}}}{{\text{N}}_{\text{A}}}}}} \right){\text{n}}_{\text{i}}^2,$$ represent in p-n junction diode? (Where the symbols have their usual meaning)

A) Forward current B) Diffusion current C) Drift current D) Reverse saturation current

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Answer & Solution

Answer: Option D

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9

In a MOSFET, the pinch-off voltage refers to

A) drain-to-source voltage at which drain-to-source current is zero B) gate-to-source voltage at which gate-to-source current is zero C) drain-to-source voltage at which gate-to-source current is zero D) gate-to-source voltage at which drain-to-source current is zero

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Answer: Option D

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10

Which of the following statements is not true for hole?

A) Holes may constitute an electric current B) Holes can be considered as a net positive charge C) Holes can exist in any material including conductors D) Holes can exist in certain semi-conductor material only

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Answer & Solution

Answer: Option C

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Electronic Devices And Circuits MCQ Questions & Answers | ECE