NAVEDTRA 14179A, NEETS Mod. 7, Ch. 1 Flashcards Preview

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Flashcards in NAVEDTRA 14179A, NEETS Mod. 7, Ch. 1 Deck (50)
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1

What are two of the most widely known semiconductors that are in use today?

Junction diode and the Transistor

2

Which type of device operates by virtue of the movement of electrons within a solid piece of semiconductor material?

Solid-state

3

What is a minute piece of semiconductor material that can produce complete electronic circuit functions?

Integrated circuit

4

Which year did Michael Faraday discover that silver sulfide, a semiconductor, has a negative temperature coefficient?

1883

5

Which year did Munk A. Rosenshold find that certain materials have rectifying properties?

1885

6

Who invented the photophone?

Alexander Graham Bell

7

Which material used in communications was found to be the most stable?

Silicon

8

Which type of material was found to be the most sensitive for use in early radio receivers?

Galena

9

What could be designed to work within the ultra-high frequencies used in radar, whereas the electron tube could not? 



Point-contact semiconductor diode

10

Whose initial work led to the development of zener diode which is frequently used today to regulate power supply voltages at precise levels?

Dr. Carl Zener

11

The maximum allowable voltage for a transistor is limited to about 200 volts (but usually how many volts or less)?

50

12

The maximum power output for transistor generally ranges from 30 milliwatts to slightly over how many watts?

100

13

Which two parts is the universe, as we know it today, divided into?

Matter and energy

14

What is anything that occupies space and has weight known as?

Matter

15

What are the three states that matter may be found in?

Solids, liquids, and gases

16

What is a chemical combination of two or more elements called?

Compound

17

What is the smallest part of a compound called which has all the characteristics of the compound?

Molecule

18

What carries a positive charge of electricity equal and opposite to the charge of the electron?

Proton

19

Approximately how many times is the mass of the proton to that of an electron?

1,827

20

What has a mass approximately equal to that of a proton but has no electrical charge?

Neutron

21

What is a list of all the known elements with the number of electrons in each atom contained?

Periodic table of elements

22

What is an atom’s ability to combine with other atoms called?

Valence

23

What is the outer shell of an atom called?

Valence shell

24

In simple terms, energy is required in definite units to move electrons from one shell to the next higher shell. What are these units called? 



Quanta

25

In which process does an atom lose or gain electrons?

Ionization

26

Which band are electrons never found in, but may travel back and forth through it, provided they do not come to rest in the band?

Forbidden

27

The conduction band along with which other band are the two energy bands that an electron can exist in?

Valence

28

The chemical activity of an atom is determined by the number of what in its valence shell?

Electrons

29

What is a solid whose atoms or molecules are arranged in a three-dimensional geometrical pattern commonly referred to as a lattice called?

Crystal

30

Arsenic, antimony, bismuth, and phosphorous are all what type of impurities?

Pentavalent