Electronic Devices And Circuits MCQ Questions & Answers

71

V_T in MOSFET increases if t_ox . . . . . . . .

A) Increase B) Decrease C) No effect D) 1^st increases then decreases

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Answer & Solution

Answer: Option A

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72

Which one of the following statements is correct?
A tunnel diode is always biased

A) by a d.c. source B) in the middle of its negative resistance region C) in the positive resistance region nearest to zero D) in the reverse direction

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Answer & Solution

Answer: Option B

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73

The electrodes of a semi-conductor diode are known as:

A) gate and source B) anode and cathode C) collector and base D) cathode and drain

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Answer & Solution

Answer: Option B

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74

For current flowing through semiconductor, which of the following statement is true?

A) Only conduction current B) Only diffusion current C) Conduction current + Diffusion current D) None of these

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Answer & Solution

Answer: Option C

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75

The device that convert optical radiation into electrical energy is:

A) LED B) Photo-detector C) Solar cell D) P-I-N diode

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Answer & Solution

Answer: Option C

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76

If an input signal ranges from 20 µA - 40 µA with an output signal ranging from 0.5 mA - 1.5 mA, what is the β_a.c?

A) 0.05 B) 20 C) 50 D) 500

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Answer & Solution

Answer: Option C

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77

A depletion mode - MOSFET is characterized by a

A) lightly doped channel between heavily doped source and drain B) heavily doped channel between lightly doped source and drain C) enhanced channel between source and drain D) lightly doped channel between drain and gate

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Answer & Solution

Answer: Option A

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78

Temperature range for Ge transistors

A) -25°C to +175°C B) -65°C to +75°C C) -65°C to +175°C D) -25°C to +75°C

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Answer & Solution

Answer: Option B

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79

The built-in potential (diffusion potential) in a p-n junction
1. is equal to the difference in the Fermi-level of the two sides, expressed in volts.
2. increases with the increase in the doping levels of the two sides.
3. increases with the increase in temperature.
4. is equal to the average of the Fermi-levels of the two sides.
Which of the above statements are correct?

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

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Answer & Solution

Answer: Option C

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80

The relative values of the forward conduction voltage for a p-n junction diode, a Red LED and a Schottky barrier diode are

A) Schottky voltage drop > p-n junction diode drop > Red LED drop B) Red LED drop > p-n junction diode drop > Schottky voltage drop C) p-n junction diode drop > Schottky voltage drop > Red LED drop D) Schottky voltage drop > Red LED drop > p-n junction diode drop

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Answer & Solution

Answer: Option B

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Electronic Devices And Circuits MCQ Questions & Answers | ECE