chapter 1

Question 1

If an excess reverse bias voltage is applied to a PN junction, the resistance drops rapidly resulting in a high current flow that destroys the junction.

Answer 1

true

Question 2

In today’s AC and DC electricity, all material can be classified as ? .

Answer 2

conductors
insulators
semiconductors

Question 3

Materials with atoms that allow the electrons in the outer valance ring to be pulled away easily make good ? .

Answer 3

conductors

Question 4

Which of the following materials is not commonly used either in pure form or mixed form for conductors?

Answer 4

Nickel

Question 5

Materials with atoms that strongly resist their electrons from being pulled away are called ? .

Answer 5

insulators

Question 6

Devices like diodes, transistors, and integrated circuits (ICs) are made of ? materials.

Answer 6

semiconductor

Question 7

What is/are the most common semiconductor material(s) used in semiconductor devices today?

Answer 7

Germanium

silicon

Question 8

The doping process includes adding impurities to a pure material to help it conduct.

Answer 8

true

Question 9

Before the doping process, the pure semiconductor material is said to be in its ? form.

Answer 9

Intrinsic

Question 10

After the doping process, the modified semiconductor material is said to be in its ? form.

Answer 10

extrinsic

Question 11

A P-type semiconductor forms when a doping material with an excess of free electrons is added to a pure semiconductor crystal.

Answer 11

false

A P-type semiconductor forms when a doping material with a deficiency of free electrons is added to a pure semiconductor crystal.

Question 12

N-type semiconductors have been doped with a material that has a deficiency of free electrons.

Answer 12

False

N-type semiconductors have been doped with a material that has an excess of free electrons.

Question 13

A deficiency of free electrons is also known as an excess of free holes.

Answer 13

true

Question 14

Which of the following are examples of N-type doping elements?

Answer 14

Antimony
Arsenic
Phosphorus

Question 15

Which of the following are examples of P-type doping elements?

Answer 15

Aluminum
Boron
Gallium
Indium

Question 16

Current flow through N-type material is electron flow; current flow through P-type material is hole flow.

Answer 16

true

Question 17

The area affected by the combining of holes and electrons is called the ? region.

Answer 17

Depletion

Question 18

During reverse biasing, the depletion region widens, allowing current flow.

Answer 18

False

Question 19

What is the approximate barrier voltage of silicon-constructed PN junction?

Answer 19

0.5 - 0.7

Question 20

The voltage at which a reverse biased junction is destroyed is called ? .

Answer 20

Avalanche voltage
peak inverse voltage
reverse breakdown voltage

Question 21

The width of the depletion region can be altered by varying the amount of ? voltage.

Answer 21

bias

Question 22

The bias voltage changes the width of the PN junction’s depletion region and, therefore, also changes its ? .

Answer 22

resistance

Question 23

The PN junction conducts when it is reverse biased and does not when it is forward biased.

Answer 23

False

The PN junction conducts when it is forward biased and does not when it is reverse biased.

Question 24

The typical amount of external voltage required to forward bias a germanium (Ge) junction is ? .

Answer 24

0.3v

Question 25

The typical amount of external voltage required to forward bias a silicon (Si) junction is ? .

Answer 25

0.7v