NAVEDTRA 14179A, NEETS Mod. 7, Ch. 2

Question 1

Which year was the first transistor discovered?

Answer 1

1948

Question 2

What are semiconductor devices called that have-three or more elements?

Answer 2

Transistors

Question 3

In which ways are transistors classified?

Answer 3

NPN or PNP

Question 4

What were the very first transistors known as?

Answer 4

Point-contact

Question 5

Which type of transistor generates less noise, handles more power, provides higher current and voltage gains, and can be mass-produced more cheaply than the point-contact transistor? 


Answer 5

Junction

Question 6

What is the process called of increasing the strength of a signal?

Answer 6

Amplification

Question 7

Which device provides amplification without appreciably altering the original signal?

Answer 7

Amplifier

Question 8

What is returning a part of the output back to its input known as?

Answer 8

Degeneration

Question 9

How many classes of amplifier operations are there?

Answer 9

Four

Question 10

Which class of amplifiers are biased so that variations in input signal polarities occur within the limits of cutoff and saturation?

Answer 10

Class A

Question 11

What occurs when the base becomes so negative with respect to the emitter that changes in the signal are not reflected in collector-current flow?

Answer 11

Saturation

Question 12

Amplifiers designed for what class of operation are biased so that collector current is zero (cutoff) for a portion of one alternation of the input signal?

Answer 12

AB

Question 13

Amplifiers biased so that collector current is cut off during one-half of the input signal are classified as what class?

Answer 13

B

Question 14

What is the faithful reproduction of a signal called?

Answer 14

Fidelity

Question 15

Which amplifier property refers to the ratio of output-signal power compared to the total input power?

Answer 15

Efficiency

Question 16

Which amplifier class has the highest efficiency of the four classes of amplifier operations?

Answer 16

Class C

Question 17

How many basic configurations may a transistor be connected in?

Answer 17

Three

Question 18

What is the most frequently used arrangement in practical amplifier circuits?

Answer 18

Common-Emitter configuration (CE)

Question 19

Which term is used to describe the amplification capabilities of the amplifier?

Answer 19

Gain

Question 20

What is the relationship of collector current (output current) to base current (input current)?


Answer 20

Beta

Question 21

What is the relationship of collector current (output current) to emitter current (input current)?

Answer 21

Alpha

Question 22

Which transistor properties are the direct voltage and current values that if exceeded in operation may result in transistor failure? 


Answer 22

Absolute Maximum Ratings

Question 23

What is one of the greatest dangers to the transistor which will cause excessive current flow and eventual destruction of the transistor?

Answer 23

Heat

Question 24

Gain, leakage, breakdown, along with what else are the four basic tests required for transistors in practical troubleshooting? 


Answer 24

Switching time

Question 25

What is a flat insulating surface upon which printed wiring and miniaturized components are connected in a predetermined design, and attached to a common base?

Answer 25

Printed circuit board

Question 26

Printed circuit boards are stacked and connected together to form a module using what technique?

Answer 26

Modular circuitry

Question 27

Which device integrates (combines) both active components (transistors, diodes, etc.) and passive components (resistors, capacitors, etc.) of a complete electronic circuit in a single chip (a tiny slice or wafer of semiconductor crystal or insulator)?

Answer 27

Integrated Circuit

Question 28

What are the two general classifications of integrated circuits?

Answer 28

Hybrid and Monolithic

Question 29

In which type of integrated circuits do all elements (resistors, transistors, etc.) associated with the circuit fabricated inseparably within a continuous piece of material (called the SUBSTRATE) which is usually silicon? 


Answer 29

Monolithic