Question 1

What type of cable is comprised of thin flexible fibers of glass or plastic that transmit light beams instead of free electrons?

Accepted Answer

A)  coaxial 
B)  stranded copper cable 
C)  fiber-optic 
D)  wave guide 
A)  coaxial 
B)  stranded copper cable 
C)  fiber-optic 
D)  wave guide C

Question 2

The capacitance exhibited by a varactor diode is controlled by ________.

Accepted Answer

A)  voltage 
B)  current 
C)  parallel circuits 
D)  resistance 
A)  voltage 
B)  current 
C)  parallel circuits 
D)  resistance A

Question 3

A seven-segment display contains seven rectangular LEDs.

Accepted Answer

A) True 
 B)False  True

Question 4

What is the display device that contains seven rectangular LEDs?

Accepted Answer

A)  CRT 
B)  liquid crystal display (LC
D)  
C)  seven-segment display 
D)  laser 
A)  CRT 
B)  liquid crystal display (LC
D)  
C)  seven-segment display 
D)  laser

Question 5

The combination of an LED and a photodiode is called a(n)

Accepted Answer

A)  seven-segment display. 
B)  laser. 
C)  LCD. 
D)  optocoupler. 
A)  seven-segment display. 
B)  laser. 
C)  LCD. 
D)  optocoupler.

Question 6

A circuit used when the desired dc output is less than the output of the power supply is a

Accepted Answer

A)  zener regulator. 
B)  high-pass filter. 
C)  low-pass filter. 
D)  bridge rectifier. 
A)  zener regulator. 
B)  high-pass filter. 
C)  low-pass filter. 
D)  bridge rectifier.

Question 7

What type of instrument can be used to test for a continuous path for current to flow?

Accepted Answer

A)  voltmeter 
B)  ammeter 
C)  oscilloscope 
D)  continuity tester 
A)  voltmeter 
B)  ammeter 
C)  oscilloscope 
D)  continuity tester

Question 8

A zener diode is a silicon diode that operates in the breakdown region.

Accepted Answer

A) True 
 B)False

Question 9

What type of bias is required for normal operation of a zener diode?

Accepted Answer

A)  reverse 
B)  forward 
C)  positive 
D)  negative 
A)  reverse 
B)  forward 
C)  positive 
D)  negative

Question 10

As frequency increases,small-signal diodes are no longer able to

Accepted Answer

A)   switch off fast enough. 
B)  amplify ac signals. 
C)  be forward biased. 
D)  serve as active filters. 
A)   switch off fast enough. 
B)  amplify ac signals. 
C)  be forward biased. 
D)  serve as active filters.

Question 11

A varactor is a variable voltage multiplier.

Accepted Answer

A) True 
 B)False

Question 12

The most important application of Schottky diodes is

Accepted Answer

A)  in digital computers. 
B)   in audio systems. 
C)  television. 
D)  filter circuits. 
A)  in digital computers. 
B)   in audio systems. 
C)  television. 
D)  filter circuits.

Question 13

In order to maintain a constant output voltage,the zener diode

Accepted Answer

A)  must be connected to a transformer. 
B)  must remain forward biased. 
C)  must remain in the breakdown region. 
D)  must be in series with a filter capacitor 
A)  must be connected to a transformer. 
B)  must remain forward biased. 
C)  must remain in the breakdown region. 
D)  must be in series with a filter capacitor

Question 14

LEDs have breakdown voltages that typically range from

Accepted Answer

A)  3 to 5 V. 
B)  1 to 2 V. 
C)  6 to 10 V. 
D)  10 to 15 V. 
A)  3 to 5 V. 
B)  1 to 2 V. 
C)  6 to 10 V. 
D)  10 to 15 V.

Question 15

With a varactor diode,the more it is reversed bias,its capacitance

Accepted Answer

A)  decreases. 
B)  increases. 
C)  remains the same. 
D)  increases to 27 µF. 
A)  decreases. 
B)  increases. 
C)  remains the same. 
D)  increases to 27 µF.

Question 16

A varistor is a semiconductor device that operates like two back-to-back zener diodes with a high breakdown in both directions.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is not an advantage of a light-emitting diode (LED)?

Accepted Answer

A)  low voltage 
B)  long life 
C)  fast on-off switching 
D)  cost 
A)  low voltage 
B)  long life 
C)  fast on-off switching 
D)  cost

Question 18

Commercial zener diodes have power ratings from ¼ to 500 W.

Accepted Answer

A) True 
 B)False

Question 19

An optoisolator combines an LED and a photodiode is a single package.

Accepted Answer

A) True 
 B)False

Question 20

A diode that is useful in frequency multiplier circuits is a

Accepted Answer

A)  snap diode 
B)  slope diode. 
C)  photo diode. 
D)  zener diode. 
A)  snap diode 
B)  slope diode. 
C)  photo diode. 
D)  zener diode.

Exam 5: Special-Purpose Diodes Key

What type of cable is comprised of thin flexible fibers of glass or plastic that transmit light beams instead of free electrons?

The capacitance exhibited by a varactor diode is controlled by ________.

A seven-segment display contains seven rectangular LEDs.

What is the display device that contains seven rectangular LEDs?

The combination of an LED and a photodiode is called a(n)

A circuit used when the desired dc output is less than the output of the power supply is a

What type of instrument can be used to test for a continuous path for current to flow?

A zener diode is a silicon diode that operates in the breakdown region.

What type of bias is required for normal operation of a zener diode?

As frequency increases,small-signal diodes are no longer able to

A varactor is a variable voltage multiplier.

The most important application of Schottky diodes is

In order to maintain a constant output voltage,the zener diode

LEDs have breakdown voltages that typically range from

With a varactor diode,the more it is reversed bias,its capacitance

A varistor is a semiconductor device that operates like two back-to-back zener diodes with a high breakdown in both directions.

Which of the following is not an advantage of a light-emitting diode (LED)?

Commercial zener diodes have power ratings from ¼ to 500 W.

An optoisolator combines an LED and a photodiode is a single package.

A diode that is useful in frequency multiplier circuits is a

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

BJT Fumdamentals

BJT Biasing

Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

Power Amplifiers

JFETS

Mosfets

Thyristors

Frequency Effects

Differential Amplifiers

Operational Amplifiers

Negative Feedback

Linear OP AMP Circuits

Active Filters Key

Nonlinear Op-Amp Circuit Applications Key

Oscillators Key

Regulated Power Supplies Key

Filters