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LVL 3 Electronics > Electronic Exam Prep > Flashcards

Electronic Exam Prep Flashcards

1
Q

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

A

Negative

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2
Q

What are the terminal names of a MOSFET?

A

Drain, Source, Gate

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3
Q

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

A

MOSFET

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4
Q

UJT and PUT are members of what electrical family?

A

Thyrister

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5
Q

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

A

GTO can be turned off with a negative voltage

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6
Q

What controls the turn on current of an SCR?

A

Gate current

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7
Q

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

A

Positive

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8
Q

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

A

Positive

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9
Q

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

A

Positive

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10
Q

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

A

Negative

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11
Q

What is a disadvantage of driving a transistor into saturation?

A

Frequency response is reduced

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12
Q

Why is it desirable to drive a transistor into saturation?

A

Less heat produced

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13
Q

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

A

5 Valance Electrons

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14
Q

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

A

4

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15
Q

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

A

4

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16
Q

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

A

Positive

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17
Q

What are the terminal names for a PUT?

A

Anode, Cathode, Gate

18
Q

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

A

Negative

19
Q

What are the terminal names for a UJT?

A

Base 1, Base 2, Emitter

20
Q

What are the terminal names for an SCR?

A

Anode, Cathode, Gate

21
Q

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

A

3

22
Q

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

A

1-3

23
Q

Does voltage or current activate a UJT or PUT?

A

Voltage

24
Q

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

A

Current

25
Q

What activates a JFET or MOSFET? Voltage or current?

A

Voltage

26
Q

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

A

0.3v

27
Q

How is an NPN or PNP driven into saturation?

A

Excess current to the base

28
Q

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

A

0.7v

29
Q

What are the terminal names for a JFET?

A

Drain, Source, Gate

30
Q

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

A

Positive

31
Q

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

A

Switching, and Amplifying

32
Q

What does SCR stand for?

A

Silicon Control Rectifier

33
Q

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

A

SCR

34
Q

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

A

Digital, 2, On, Off

35
Q

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

A

10-20.

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

36
Q

How many different types of MOSFETS?

A

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

37
Q

What does JFET stand for?

A

Junction Field Effect Transistor

38
Q

How is a Darlington amplifier made?

A

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

39
Q

Why is Silicon usually used when doping materials?

A

Silicon is better at withstanding heat than Germanium

40
Q

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

A

The amount of current flow

41
Q

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

A

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

42
Q
  1. Intrinsic Material = __________
  2. Extrinsic Material = __________
A
  1. Pure
  2. Impure

LVL 3 Electronics (1 decks)

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