A6 LT6

Question 1

How is the emitter identified in a transistor symbol?

Answer 1

Arrow from P-type to N-type

Question 2

What are the advantages of a transistor compared to a relay circuit?

Answer 2

Solid-state, no moving parts.

Question 3

What occurs when a small emitter-to-base current is established in a transistor?

Answer 3

A much larger emitter-to-collector current can occur.

Question 4

What is the difference between the emitter and collector regions of a BJT?

Answer 4

N-type

Question 5

To operate an NPN transistor, what is the requirement for the emitter?

Answer 5

It must be negative

Question 6

What happens when a transistor is saturated?

Answer 6

It is fully open

Question 7

What does a transistor do

Answer 7

1, turns on a off
Amplifys

Question 8

What happens if the P-type layer is removed?

Answer 8

Load current flows through N-type regions

Question 9

How is the base-emitter junction biased in all transistor circuits?

Answer 9

Forward-biased

Question 10

What happens when the base current is increased in a transistor circuit?

Answer 10

Decreases internal collector-to-emitter resistance

Question 11

To operate an NPN transistor, what is the requirement for the base?

Answer 11

It must be positive

Question 12

How is an NPN transistor constructed?

Answer 12

N-type/P-type/N-type

Question 13

What does the base layer of P-type semiconductor do?

Answer 13

Blocks conduction through load circuit

Question 14

How is the collector biased in all transistor circuits?

Answer 14

Reverse-biased

Question 15

To operate an NPN transistor, what is the requirement for the collector?

Answer 15

It must be positive

Question 16

What does the transistor act like when it is cut off?

Answer 16

an open switch

Question 17

How is a PNP transistor constructed?

Answer 17

P-type/N-type/P-type

Question 18

Where do electrons move once they enter the base in a control circuit?

Answer 18

Towards the collector

Question 19

To operate a PNP transistor, what is the requirement for the emitter?

Answer 19

It must be positive

Question 20

What can transistors be compared to for simple applications like ohmmeter testing?

Answer 20

Back-to-back diodes

Question 21

What does a transistor do in electronics?

Answer 21

Regulates current

Question 22

Which way does the emitter arrow point in an NPN transistor?

Answer 22

From P- to N-type semiconductor

Question 23

To operate a PNP transistor, what is the requirement for the base?

Answer 23

It must be negative

Question 24

What is the actual source of current for a transistor?

Answer 24

DC power supply like a battery

Question 25

What allows a much larger current to pass through to the collector region and the load circuit?

Answer 25

Decreasing base resistance

Question 26

What materials are most transistors made of?

Answer 26

Silicon semiconductor

Question 27

What happens when the control circuit is open in a transistor circuit?

Answer 27

No current flows.

Question 28

What are the are the 3 places on a transistor

Answer 28

Collector, Base, Emitter

Question 29

What does the beta of a transistor express?

Answer 29

Magnitude of collector current controlled by a specific value of base current

Question 30

How can you calculate the value of base current if collector current and beta are known?

Answer 30

By dividing collector current by beta.