Electronic Devices And Circuits MCQ Questions & Answers

21

MOSFET can be used as

A) Current controlled capacitor B) Voltage controlled capacitor C) Current controlled inductor D) Voltage controlled inductor

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Answer & Solution

Answer: Option B

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22

A p-n junction diode's dynamic conductance is directly proportional to

A) the applied voltage B) the temperature C) its current D) the thermal voltage

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Answer & Solution

Answer: Option C

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23

Which of the following properties does CMOS logic possess?

A) Increased capacitance B) Low static power dissipation C) Increased delay D) High noise margin

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Answer & Solution

Answer: Option B

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24

In an intrinsic semiconductor, the mobility of electrons in the conduction band is

A) Less than the mobility of holes in the valence band B) Zero C) Greater than the mobility of holes in the valence band D) Is equal to mobility of holes in valence band E) Is equal to mobility of holes in conduction band

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Answer & Solution

Answer: Option C

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25

At absolute zero temperature, an intrinsic semiconductor behave like an insulator because of

A) Low electron energy B) Low drift velocity of free electron C) Non-availability of free electron D) Non-recombination of electron with hole

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Answer & Solution

Answer: Option C

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26

For an n-type semiconductor having any doping level, which of the following hold(s) good:

A) P_nN_D = n_i² B) p_pN_D = n_i² C) n_nN_D = n_i² D) P_nn_n = n_i²

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Answer & Solution

Answer: Option A

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27

A photodiode is normally:

A) Forward biased B) Emitting light C) Neither forward nor reverse biased D) Reverse biased

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Answer & Solution

Answer: Option D

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28

A semiconductor specimen of breadth d, width w and carrying current I is placed in a magnetic field B to develop Hall voltage V_H in a direction perpendicular to I and B. V_H is NOT proportional to

A) B B) I C) $$\frac{1}{{\text{W}}}$$ D) $$\frac{1}{{\text{d}}}$$

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Answer & Solution

Answer: Option D

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29

Miller indices are same for:

A) Crystal planes B) Parallel planes C) Perpendicular planes D) Three crystallographic planes

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Answer & Solution

Answer: Option B

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30

For smooth and reliable operation of an amplifier using BJT, it is necessary that the circuit must be properly designed from the point of view of bias stabilization, because
1. Reverse saturation current I_CO increases with rise in temperature.
2. V_BE decreases with rise in temperature.
3. h_FE or β changes with change of temperature and replacement of the transistor.
4. h_FE or β changes with change in collector supply voltage.
Which of these statements are correct?

A) 1, 2 and 3 only B) 1, 2 and 4 only C) 2, 3 and 4 only D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option A

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Electronic Devices And Circuits MCQ Questions & Answers | ECE