Electronic Exam Prep

Question 1

What is the source terminal polarity in an N-channel JFET?

Answer 1

Negative

Question 2

What are the terminal names of a MOSFET?

Answer 2

Drain, Source, Gate

Question 3

Is an IGFET the same as a MOSFET or a JFET?

Answer 3

MOSFET

Question 4

UJT and PUT are members of what electrical family?

Answer 4

Thyrister

Question 5

What is the advantage of a GTO-SCR compared to an SCR?

Answer 5

GTO can be turned off with a negative voltage

Question 6

What controls the turn on current of an SCR?

Answer 6

Gate current

Question 7

What is the polarity of the Gate terminal on an SCR?

Answer 7

Positive

Question 8

What is the polarity of the emitter pin in a UJT?

Answer 8

Positive

Question 9

What is the polarity of the Base 2 pin in a UJT?

Answer 9

Positive

Question 10

What is the polarity of the Base 1 pin in a UJT?

Answer 10

Negative

Question 11

What is a disadvantage of driving a transistor into saturation?

Answer 11

Frequency response is reduced

Question 12

Why is it desirable to drive a transistor into saturation?

Answer 12

Less heat produced

Question 13

How many valence electrons must the impurity have to make an N-type material?

Answer 13

5 Valance Electrons

Question 14

How many layers of semi-conductor material are in an SCR?

Answer 14

4

Question 15

How many valence electrons are there in a semi-conductor?

Answer 15

4

Question 16

What is the polarity of the Collector terminal of an NPN Transistor?

Answer 16

Positive

Question 17

What are the terminal names for a PUT?

Answer 17

Anode, Cathode, Gate

Question 18

What is the polarity of the Base terminal in a PNP transistor?

Answer 18

Negative

Question 19

What are the terminal names for a UJT?

Answer 19

Base 1, Base 2, Emitter

Question 20

What are the terminal names for an SCR?

Answer 20

Anode, Cathode, Gate

Question 21

When making P-type material, an impurity must be added to a pure semi-conductor material. How many valence electrons will this impurity have?

Answer 21

3

Question 22

An atom of material used for a conductor will contain how many valence electrons?

Answer 22

1-3

Question 23

Does voltage or current activate a UJT or PUT?

Answer 23

Voltage

Question 24

What activates a BJT?(NPN or PNP), voltage or current?

Answer 24

Current

Question 25

What activates a JFET or MOSFET? Voltage or current?

Answer 25

Voltage

Question 26

What is the voltage drop between the collector and emitter when a PNP or NPN transistor is driven into saturation?

Answer 26

0.3v

Question 27

How is an NPN or PNP driven into saturation?

Answer 27

Excess current to the base

Question 28

What is the voltage between the collector and the emitter in an NPN transistor, when the transistor is turned completely on?

Answer 28

0.7v

Question 29

What are the terminal names for a JFET?

Answer 29

Drain, Source, Gate

Question 30

What is the polarity of the emitter terminal of a PNP transistor?

Answer 30

Positive

Question 31

Bipolar Junction Transistor's have 2 uses, what are they?

Answer 31

Switching, and Amplifying

Question 32

What does SCR stand for?

Answer 32

Silicon Control Rectifier

Question 33

Which device can turn off when Gate voltage gets too low?

Answer 33

SCR

Question 34

An SCR is a(n) _______ device so it only has _______ states. ____ or _____

Answer 34

Digital, 2, On, Off

Question 35

An SCR requires how many times more current to turn it off vs on?

Answer 35

10-20. Also: The SCR can also be completely controlled with the Gate.

Question 36

How many different types of MOSFETS?

Answer 36

4: P and N channel E-MOSFETS P and N Channel DE-MOSFETS

Question 37

What does JFET stand for?

Answer 37

Junction Field Effect Transistor

Question 38

How is a Darlington amplifier made?

Answer 38

By connecting a the emitter from one transistor to the to the base of another transistor

Question 39

Why is Silicon usually used when doping materials?

Answer 39

Silicon is better at withstanding heat than Germanium

Question 40

What is the amount of impedence in a transistor determined by?

Answer 40

The amount of current flow

Question 41

What condition must be met to use a transistor as an amplifier?

Answer 41

Must be Biased. Bias mean to present or pre-condition

Question 42

1. Intrinsic Material = __________ 2. Extrinsic Material = __________

Answer 42

1. Pure 2. Impure