Electronic Devices And Circuits MCQ Questions & Answers

41

Storage time of a transistor is the time taken for the collector curves to fall to

A) 90% from maximum value B) 10% from maximum value C) 10% to 90% from maximum value D) 50% from maximum value

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Answer & Solution

Answer: Option C

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42

A zener diode, when used in voltage stabilization circuits, is biased in

A) reverse bias region below the breakdown voltage B) reverse breakdown region C) forward bias region D) forward bias constant current mode

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Answer & Solution

Answer: Option B

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43

Consider the following statements for a photo conducting material:
1. Its dark conductivity is small.
2. With the absorption of radiation, equal numbers of electrons and holes are produced.
Which of the statements given above is/are correct?

A) 1 only B) 2 only C) Both 1 and 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option C

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44

A switched mode power supply operating at 20 kHz to 100 kHz range used as the main switching element is

A) Thyristor B) MOSFET C) Triac D) UJT

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Answer & Solution

Answer: Option B

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45

If a certain Zener diode has a Zener voltage of 3.6 V and reverse bias voltage of 5 V is applied across it, the Zener operates in . . . . . . . .

A) forward conduction B) avalanche breakdown C) regulated breakdown D) Zener breakdown

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Answer & Solution

Answer: Option D

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46

Electronic distribution of an Si atom is

A) 2, 10, 2 B) 2, 8, 4 C) 2, 7, 5 D) 2, 4, 8

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Answer & Solution

Answer: Option B

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47

The resistivity of a metal is a function of temperature because

A) The electron density varies with temperature B) The electron gas density varies with temperature C) The lattices vibration increases with temperature D) Collision of electrons increases as temperature increases

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Answer & Solution

Answer: Option C

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48

By increasing temperature, the electrical conductivity would:

A) increase in metals as well as in intrinsic semiconductors B) increase in metals but decrease in intrinsic semiconductors C) decrease in metals but increase in intrinsic semiconductors D) decrease in metals as well as in intrinsic semiconductors

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Answer & Solution

Answer: Option C

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49

The speed power product for static CMOS is:

A) Sp = CV B) Sp = C²V C) Sp = CV² D) Sp = dependent on frequency

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Answer & Solution

Answer: Option C

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50

A long-channel NMOS transistor is biased in the linear region with V_DS = 50 mV and is used as a resistance. Which one of the following statements is NOT correct?

A) If the device width W is increased, the resistance decreases B) If the threshold voltage is reduced, the resistance decreases C) If the device length L is increased, the resistance increase D) If V_GS is increased, the resistance increases

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Answer & Solution

Answer: Option D

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Electronic Devices And Circuits MCQ Questions & Answers | ECE