Final Review Sheets

Question 1

When atoms of a purified semiconductor material arrange themselves in a pattern, the pattern is called?

Answer 1

crystal-lattice

Question 2

Two common types of semiconductor elements?

Answer 2

germanium

silicon

Question 3

The sharing of valence electrons by adjoining atoms in a crystal-lattice structure is called?

Answer 3

covalent bonding

Question 4

By doping a pure semiconductor with a trivalent impurities, a/an type semiconductor is formed?

Answer 4

P-type

Question 5

An N-type semiconductor has an excess of?

Answer 5

electrons

Question 6

Semiconductors have a ______________________ coefficient?

Answer 6

negative temperature

Question 7

why is silicon more commonly used than germanium for semiconductor devices?

Answer 7

silicon can withstand higher temperatures

Question 8

barrier potential of silicon?

Answer 8

.7v

Question 9

What happens if the PIV of a diode is exceeded?

Answer 9

current avalanches

Question 10

When using the Sanwa VOM to test a diode, what is the polarity of the leads?

Answer 10

black is positive

red is negative

Question 11

Zener diodes are connected in ________?

Answer 11

reverse bias

Question 12

A zener silicon diode connected in forward bias would have a voltage drop of?

Answer 12

.7v

Question 13

An LED operates in?

Answer 13

forward bias

Question 14

A semiconductor substrate doped with arsenic would be considered as _________-type semiconductor.

Answer 14

N

Question 15

The forward current rating of an LED should not exceed _________mA

Answer 15

50

Question 16

The PIV rating of an LED is about ______ volts

Answer 16

6

Question 17

A clipper or surge suppressor circuit (to protect a load against peak voltage levels) can be constructed by using a device called a ___________?

Answer 17

varistor

Question 18

zener diodes are most commonly used in DC circuits as a ______ _________?

Answer 18

voltage regulator

Question 19

When a diode is connected across an inductive DC load (to protect arcing during switching operations), it is often called a _____________ diode.

Answer 19

freewheeling

Question 20

Reverse-bias is a term used to indicate that the Anode is _________ with respect to the Cathode

Answer 20

negative

Question 21

State how “N-type” semiconductor material is made?

Answer 21

By doping pure semiconductor (silicon) with appropriate pentavalent element such as arsenic

Question 22

Definition of Peak Inverse Voltage?

Answer 22

Max reverse voltage applied to diode without breaking it down