boylestad electronics multiple choice q&a chapter (16)

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Site Title: Electronic Devices and Circuit Theory

Summary of Results 23% Correct of 35 Score d ite m s:

Book Author: Boylestad Location on Chapter 16 > Multiple Choice Site: Date/Time October 12, 2012 at 12:53 AM Submitted: (UTC/GMT)

1.

8 C orre ct:

23%

27 Incorre ct:

77%

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Which of the following is (are) diodes? Your Answer: Schottky Correct Answer: All of the above

2.

Which of the following metals is (are) used in the fabrication of Schottky diodes? Your Answer: Molybdenum Correct Answer: All of the above

3.

What are the typical ranges of reverse-bias current levels IS for low-power and high-power Schottky diodes at room temperature? Your Answer: Picoamperes, nanoamperes Correct Answer: Microamperes, milliamperes

4.

What is the voltage drop across Schottky diodes? Your Answer: 0 V to 0.2 V

5.

What metal(s) is(are) used in the construction of Schottky diodes? Your Answer: Molybdenum Correct Answer: Any of the above

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For a 50-A unit, the PIV of the Schottky is about _____ compared to 150 V for the p-n junction variety. 1/ 4

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Your Answer: 75 Correct Answer: 50

7.

Schottky diodes are very effective at frequencies approaching _____. Your Answer: 1 MHz Correct Answer: 20 GHz

8.

This is an approximate equivalent circuit for the _____ diode.

Your Answer: varicap Correct Answer: Schottky

9.

What is the range of the varying capacitor C T in varactor diodes? Your Answer: 2 pF to 100 pF

10.

Which of the following areas is (are) applications of varactor diodes? Your Answer: FM modulators Correct Answer: All of the above

11.

The tuning diode is a _____-dependent, variable _____. Your Answer: current, capacitor Correct Answer: voltage, capacitor

12.

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This is an equivalent circuit for the _____ diode.

2/ 4

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Your Answer: tunnel Correct Answer: varicap

13.

The varicap diode has a transition capacitance sensitive to the applied reverse-bias potential that is a maximum at zero volts and decreases _____ with increasing reverse-bias potentials. Your Answer: exponentially

14.

The majority of power diodes are constructed using _____. Your Answer: silicon

15.

The current capability of power diodes can be increased by placing two or more in series. Your Answer: True Correct Answer: False

16.

The PIV rating of power diodes can be increased by stacking the diodes in series. Your Answer: False Correct Answer: True

17.

Which of the following diodes has a negative-resistance region? Your Answer: Power Correct Answer: Tunnel

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Which of the following semiconductor materials is (are) u 3/ 4

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4/ 4