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ATI2 MAR2017 > NAVEDTRA 14179A, NEETS Mod. 7, Ch. 1 > Flashcards

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

1
Q

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

A

Junction diode and the Transistor

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2
Q

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

A

Solid-state

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3
Q

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

A

Integrated circuit

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4
Q

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

A

1883

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5
Q

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

A

1885

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6
Q

Who invented the photophone?

A

Alexander Graham Bell

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7
Q

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

A

Silicon

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8
Q

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

A

Galena

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9
Q

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



A

Point-contact semiconductor diode

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10
Q

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

A

Dr. Carl Zener

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11
Q

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

A

50

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12
Q

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

A

100

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13
Q

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

A

Matter and energy

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14
Q

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

A

Matter

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15
Q

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

A

Solids, liquids, and gases

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16
Q

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

A

Compound

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17
Q

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

A

Molecule

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18
Q

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

A

Proton

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19
Q

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

A

1,827

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20
Q

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

A

Neutron

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21
Q

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

A

Periodic table of elements

22
Q

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

A

Valence

23
Q

What is the outer shell of an atom called?

A

Valence shell

24
Q

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? 



A

Quanta

25
Q

In which process does an atom lose or gain electrons?

A

Ionization

26
Q

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?

A

Forbidden

27
Q

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

A

Valence

28
Q

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

A

Electrons

29
Q

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

A

Crystal

30
Q

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

A

Pentavalent

31
Q

Aluminum, indium, gallium, and boron are all what type of impurities?

A

Trivalent

32
Q

Which type of device is obtained when a section of N-type semiconductor material is joined with a similar section of P-type semiconductor material?

A

PN Junction

33
Q

What is the overall charge of N material?

A

Zero

34
Q

What is the electrostatic field called that is created by the positive and negative ions in the depletion region?


A

Barrier

35
Q

What is an external voltage applied to a PN junction called?

A

Bias

36
Q

What offers very little resistance to current flow in the forward-bias direction but maximum resistance to current flow when reverse biased? 



A

PN junction diode

37
Q

What is one of the most important uses of a diode?

A

Rectification

38
Q

What is the simplest type of rectifier circuit?

A

Half-wave rectifier

39
Q

What is any device that draws current defined as?

A

Load

40
Q

There are many known metal-semiconductor combinations that can be used for contact rectification. Which devices are by far the most popular? 


A

Copper oxide and selenium

41
Q

Copper-oxide rectifiers are generally used in small-current applications such as AC meter movements or for delivering direct current to circuits requiring not more than how many amperes?

A

10

42
Q

What is the maximum reverse DC voltage that will not cause breakdown called?

A

DC Blocking voltage

43
Q

What temperature is the maximum average forward current usually given at?

A

77 degrees F

44
Q

What is the maximum current called that is permitted to flow in the forward direction in the form of nonrecurring pulses?

A

Maximum surge current

45
Q

What indicates the maximum reverse-bias voltage that may be applied to a diode without causing junction breakdown?
PRV

A

PRV

46
Q

What is the most convenient and quickest way of testing a diode?

A

Ohmmeter

47
Q

Which substance cannot be reduced to a simpler form by chemical means?

A

Element

48
Q

What is the smallest particle into which an element can be broken down and still retain all its original properties? 


A

Atom

49
Q

What is the amount of energy required by an electron to stay in orbit?

A

Electron energy level

50
Q

What is the process by which small amounts of selected additives, called impurities, are added to semiconductors to increase their current flow?

A

Doping

ATI2 MAR2017 (42 decks)

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