boylestad electronics multiple choice q&a chapter (17)

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Site Title: Electronic Devices and Circuit Theory

Summary of Results

Book Author: Boylestad

35% Correct of 34 Score d ite m s:

Location on Site: Chapter 17 > Multiple Choice

12 C orre ct:

Date/Time October 12, 2012 at 12:55 AM (UTC/GMT) Submitted:

1.

22 Incorre ct:

35% 65%

More inform ation about scoring

How many layers of semiconductor materials does a silicon-controlled rectifier (SCR) have? Your Answer: 2 Correct Answer: 4

2.

Which of the following devices has (have) four layers of semiconductor materials? Your Answer: Silicon-controlled switch (SCS) Correct Answer: All of the above

3.

A thyristor is a _____-layer semiconductor material device. Your Answer: 2 Correct Answer: 4

4.

Which of the following devices is unquestionably of the greatest interest today? Your Answer: SCR

5.

What is the frequency range of application of SCRs? Your Answer: About 10 kHz Correct Answer: About 50 kHz

6.

Which one of the SCR terminals fires the SCR? Your Answer: Anode Correct Answer: Gate

7.

What is the typical value of the reverse resistance of SCRs? Your Answer: 1

to 10

Correct Answer: 100 k

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8.

Which of the following transistors is an SCR composed of? Your Answer: npn, npn Correct Answer: npn, pnp

9.

Which of the transistors of an SCR are conducting when the SCR is fired and is in the conduction mode? Your Answer: Both npn and pnp

10.

What is the range of the turn-on times in high-power SCR devices? Your Answer: 30 Correct Answer: 10

11.

s to 25

s s

What is the typical range of turn-off times for SCRs? Your Answer: 5

12.

s to 100

s to 30

s

This symbol is an example of a(n) _____.

Your Answer: SCR

13.

Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs? Your Answer: Junction and case temperatures (tj and tc ) Correct Answer: All of the above

14.

How many terminals does a silicon-controlled switch (SCS) device have? Your Answer: 4

15.

What is the typical value of the triggering anode gate for SCS devices? Your Answer: 1 A Correct Answer: 1.5 mA

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16.

Which of the following is (are) the advantages of the SCS over a corresponding SCR? Your Answer: Increased control and triggering sensitivity Correct Answer: All of the above

17.

Which of the following areas is (are) applications of an SCS? Your Answer: Voltage sensors Correct Answer: All of the above

18.

This symbol is an example of a(n)_____.

Your Answer: DIAC Correct Answer: SCS

19.

For an SCS, a _____ pulse at the anode gate turns the device on, while a _____ pulse will turn it off. Your Answer: positive, negative Correct Answer: negative, positive

20.

An advantage of the SCR over the SCS is the reduced turn-off time. Your Answer: False

21.

Which of the following devices has the smallest turn-off time? Your Answer: GTO

22.

Which of the following devices has nearly the same turn-on time as turn-off time? Your Answer: GTO

23.

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This symbol is an example of a(n) _____.

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Your Answer: GTO

24.

What is the maximum current (rms) rating for commercially available LASCRs today? Your Answer: 3 A

25.

How many terminals does a Shockley diode have? Your Answer: 3 Correct Answer: 2

26.

This symbol is an example of a(n) _____.

Your Answer: SCS Correct Answer: DIAC

27.

Which of the following devices does not have a cathode terminal? Your Answer: Shockley diode Correct Answer: Triac

28.

Today, the SCR is more widely used than the TRIAC. Your Answer: False

29.

Which of the following devices has a negative-resistance region in its characteristics curve? Your Answer: Phototransistor Correct Answer: Unijunction transistor

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What is the range of the variable resistor in the equivalent circuit of a unijunction transistor? QLS

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Your Answer: 50

31.

to 5 k

This is an example of a high-isolation _____ gate.

Your Answer: NOT Correct Answer: AND

32.

The ISO-LIT Q1 16-pin Litronix opto-isolator DIP contains _____ opto-isolators. Your Answer: 6 Correct Answer: 4

33.

How many terminals does a programmable unijunction transistor (PUT) have? Your Answer: 1 Correct Answer: 3

34.

Determine RB1 for a silicon PUT if it is determined that h = 0.84, VP = 11.2 V, and RB2 = 5 k . Your Answer: 12.65 k Correct Answer: 26.25 k

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