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Electronic Devices MCQ

1. Consumers prefer mobile commerce sites ________.

That have many low price items on sale

That are convenient and efficient to use

That are linked to the consumers' banks

That belong to traditional stores like Wal-mart or Best Buy

Answer

Correct Answer: That are convenient and efficient to use

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2. A reverse-biased silicon diode has about 0.7 V across it.

False

True

Answer

Correct Answer: False

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3. In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by the value of the filter capacitor or the load resistors.

Decreasing, decreasing

Increasing, decreasing

Increasing, increasing

Decreasing, increasing

Answer

Correct Answer: Increasing, increasing

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4. The output frequency of a full-wave rectifier is ________ the input frequency.

One-quarter

One-half

Twice

Equal to

Answer

Correct Answer: Twice

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5. As the forward current through a silicon diode increases, the voltage across the diode:

Decreases and then increases

Is relatively constant

Decreases

Increases to a 0.7 V maximum

Answer

Correct Answer: Is relatively constant

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6. A(n) ________ is the simplest of semiconductor devices.

Operational amplifier

SCR

Transistor

Diode

Answer

Correct Answer: Diode

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7. The output impedance of a voltage buffer is ________.

Very low

Very high

High

Low

Answer

Correct Answer: Low

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8. In an improved shunt regulator, which of the following components sets the reference voltage?

Zener diode

Transistor Q1

Transistor Q2

Answer

Correct Answer: Zener diode

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9. The lower doping level the conductivity and the resistivity of the material.

Increases, increases

Decreases, increases

Increases, decreases

Decreases, decreases

Answer

Correct Answer: Decreases, increases

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10. Which of the following materials is (are) used in the manufacturing of thermistors?

All

A mixture of oxides of cobalt, nickel, strontium, or manganese

Answer

Correct Answer: All

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11. A good op-amp has low voltage gain, low output impedance, and high input impedance.

True

False

Answer

Correct Answer: False

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12. The start-up gain of an oscillator must be ________ one.

Greater than

Less than

Equal to

None

Answer

Correct Answer: Greater than

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13. In n-type material the ________ is called the majority carrier.

Electron

Hole

Neutron

Proton

Answer

Correct Answer: Electron

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14. In what decade was the first transistor created?

1950s

1930s

1940s

1960s

Answer

Correct Answer: 1940s

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15. The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________.

Common-mode gain

CMRR

Closed-loop gain

Open-loop gain

Answer

Correct Answer: Closed-loop gain

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16. In a half-wave variable-resistance phase control operation, the control cannot be extended past a ________ phase displacement.

180º

90º

45º

135º

Answer

Correct Answer: 90º

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17. For a given input frequency, a half-wave rectifier is easier to filter than a full-wave rectifier.

True

False

Answer

Correct Answer: False

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18. For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________.

1.414 ÷ C

0.785 ÷ C

1.3 ÷ C

0.707 ÷ C

Answer

Correct Answer: 1.3 ÷ C

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19. The silicon material used in semiconductors is extremely pure with no additives.

True

False

Answer

Correct Answer: False

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20. The common-gate configuration has extremely high input resistance.

False

True

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

Engineering MCQs | Topic-wise

MCQ on Basic Engineering	MCQ on Chemical Engineering
MCQ on Chemical Kinetics	MCQ on Civil Engineering
MCQ on Digital Logic	MCQ on Educational Technology
MCQ on Electrical Engineering	MCQ on Electronic Devices
MCQ on Electronics Engineering	MCQ on Mechanics Engineering
MCQ on Networks & Telecommunication	General Engineering MCQs

Electronic Devices MCQ

1. Consumers prefer mobile commerce sites ________.

2. A reverse-biased silicon diode has about 0.7 V across it.

3. In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by ________ the value of the filter capacitor or ________ the load resistors.

4. The output frequency of a full-wave rectifier is ________ the input frequency.

5. As the forward current through a silicon diode increases, the voltage across the diode:

6. A(n) ________ is the simplest of semiconductor devices.

7. The output impedance of a voltage buffer is ________.

8. In an improved shunt regulator, which of the following components sets the reference voltage?

9. The lower doping level ________ the conductivity and ________ the resistivity of the material.

10. Which of the following materials is (are) used in the manufacturing of thermistors?

11. A good op-amp has low voltage gain, low output impedance, and high input impedance.

12. The start-up gain of an oscillator must be ________ one.

13. In n-type material the ________ is called the majority carrier.

14. In what decade was the first transistor created?

15. The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________.

16. In a half-wave variable-resistance phase control operation, the control cannot be extended past a ________ phase displacement.

17. For a given input frequency, a half-wave rectifier is easier to filter than a full-wave rectifier.

18. For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________.

19. The silicon material used in semiconductors is extremely pure with no additives.

20. The common-gate configuration has extremely high input resistance.

3. In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by the value of the filter capacitor or the load resistors.

9. The lower doping level the conductivity and the resistivity of the material.