Electronics Final

Question 1

How many layers are in a BJT ?

Answer 1

3

Question 2

When testing a Good triac between MT2 and MT1 and gate disconnected, should read ?

Answer 2

OL both directions

Question 3

Does the arrow in a PNP point positive to negative ? True or false

Answer 3

True. Points from P-N

Question 4

If NO current is conducted at the base, then current can’t flow, what mode is this ?

Answer 4

Cutoff Mode

Question 5

When a transistor is used as an amplifier it is biased into ________\ mode of operation

Answer 5

Active mode

Question 6

When a transistor is fully on and current flow between collector and emitter is at maximum, what mode ?

Answer 6

Saturation mode

Question 7

When testing a good BJT what is the voltage drop from base to emitter

Answer 7

0.7v

Question 8

To turn on a NPN transistor, the voltage at the base must be more __________ then the emitter

Answer 8

Positive

Question 9

To turn on a PNP transistor the voltage must be more ___________ then the emitter

Answer 9

Negative

Question 10

Polarity of the collector on an NPN transistor

Answer 10

Positive

Question 11

Polarity of the collector on a PNP transistor ?

Answer 11

Negative

Question 12

What are two general applications where a transistor is used ?

Answer 12

Switching or Amplifications

Question 13

A diode is tested and measured 0V in forward, and 0V in reverse, the diode is ________?

Answer 13

Failed short

Question 14

To turn off an SCR the anode current must be reduced below the devices ________ current

Answer 14

Holding

Question 15

Three terminals on a BJT

Answer 15

Collector, Emitter, Base

Question 16

3 terminals on a JFET

Answer 16

Gate, Drain, Source

Question 17

What are two types of doping, used in a semiconductor?

Answer 17

P type
N type

Question 18

Which direction do electrons flow with respect to voltage polarity ?

Answer 18

Positive - negative

Question 19

How many layers in a single diode ?

Answer 19

2

Question 20

To turn on a N-channel EMosfet the voltage at the gate must be more ________ then the source terminal

Answer 20

Positive

Question 21

The polarity of the drain voltage on a NChan FET is _____?

Answer 21

Positive

Question 22

The polarity of the drain on a P-Channel FET is ________?

Answer 22

Negative

Question 23

What type of MOSFET operates like a normally open switch ?

Answer 23

E mosfet

Question 24

What transistor family has the highest power rating ?

Answer 24

IGBT

Question 25

What device family is the SCR?

Answer 25

Thyristors

Question 26

What forward and reverse measurement are expected when testing a SCR with its gate disconnected?

Answer 26

Open cct

Question 27

Decreasing the base current in a BJT will cause impedance to _______?

Answer 27

Increase

Question 28

To trigger a thyristor later then 90’ in a ac cycle, the gate must be phase shifted with a _________?

Answer 28

Capacitor

Question 29

The voltage that causes a diode to conduct in a reverse direction is what ?

Answer 29

Peak inverse voltage

Question 30

How many valence electrons do P type dopants have ?

Answer 30

3

Question 31

To turn on a SCR the anode must be made more ___________ then the cathode, and gate current must be ___________.

Answer 31

Positive & positve

Question 32

What terminal does a gate have to be connected to when testing a TRIAC?

Answer 32

T2

Question 33

Testing a BJT, base to collector = ________ voltage drop

Answer 33

OL

Question 34

Testing a BJT base to emitter = _______ voltage drop

Answer 34

.7v

Question 35

How many layers in a thyristor ?

Answer 35

4 layers

Question 36

Thyristor are latching devices, once triggered into ON state, they remain ON until current flow is reduced below _________ current

Answer 36

Holding

Question 37

Three terminals on a UJT

Answer 37

Base 1 , base 2, emitter

Question 38

3 terminals on a SCR ?

Answer 38

Anode, cathode, gate

Question 39

SCRS can only operate in _________ direction

Answer 39

Forward

Question 40

To turn on a SCR, ______voltage and current are applied to the gate with respect to cathode

Answer 40

Positve

Question 41

SCR with gate disconnected will measure what?

Answer 41

OL in either direction

Question 42

IN a SCR gate to cathode should register a voltage drop of ?

Answer 42

.7

Question 43

Jeff’s drug of choice ?

Answer 43

Percocet