Elec

Question 1

Terminal names of a BJT

Answer 1

Base emitter current

Question 2

Terminal names of UJT?

Answer 2

B1
B2
Emitter

Question 3

Terminal of a PUT ?

Answer 3

Anode cathode gate

Question 4

Terminal of a SCR ?

Answer 4

Anode
Cathode
Gate

Question 5

What activated a BJT?

Answer 5

Current activated

Question 6

What activated a UJT?

Answer 6

Voltage activated

Question 7

What determines the impedance of of a BJT?

Answer 7

Amount of current flow

Question 8

A PNP transistor has one positive terminal. Identify.

Answer 8

Emitter

Question 9

BJTs have 2 general uses , what are they?

Answer 9

Switch or amplifier

Question 10

A bjt is connected into a circuit as an amplifier. A power supply furnishes 12 volts to the transistor when presetting the transistor . How much volts should be dropped across the collector emitter section to the transistor ?

Answer 10

6 volts

Question 11

Polarity of the base of a NPN transistor ?

Answer 11

Positive polarity

Question 12

Polarity of collector In a npn transistor?

Answer 12

Positive polarity

Question 13

Layers of a semiconductor material in an scr ?

Answer 13

4

Question 14

Layers of a semiconductor in a BJT?

Answer 14

3

Question 15

A non transisrornis used as a switch and has 250 mA collector emitter . If the transistor is driven into saturation . Then how much heat will the collector emitter produce ?

Answer 15

E = 0.3 v
I = 250mA
P =75mW

Question 16

Ujt, PUT , SCR are members of the

Answer 16

Thermistor family

Question 17

An impurity with how many valence electrons in a N-type material

Answer 17

5 valence electrons
If it were p-type it would ve 3

Question 18

Silicon over germanium In the making of solid state devices

Answer 18

Handles more heat

Question 19

Electrons in valence shell used as a conductor

Answer 19

1 to 3

Question 20

Electrons in a valence shell element used as an insulator

Answer 20

7 or 8

Question 21

Electrons Ina valence shell element used as a semiconductor ?

Answer 21

4

Question 22

How is a transistor driven into saturation ?

Answer 22

Increased base current

Question 23

Disadvantage of driver over transistor?

Answer 23

Less frequency and reduced speed

Question 24

When a transistor is said to be completely turned off. What us the voltage drop against collector-emitter?

Answer 24

0.7 volts.

Question 25

A transistor into saturation. What is the voltage drop across collector-emitter ?

Answer 25

0.3 volts

Question 26

SCR stands for

Answer 26

Silicon controlled rectifier

Question 27

Advantage of GTO over SCR

Answer 27

Good can be turned off with a negative pulse rate.
Scr cannot

Question 28

Gate current required for a GTO to turn off compared to on?

Answer 28

10 to 20 times

Question 29

A common standard off ratio percentage

Answer 29

63.2 %

Question 30

Pulse rate of ujt controlled byb

Answer 30

Resistance and inductive reactancw controlled by the enitter

Question 31

Bias mean

Answer 31

Pre set or precondition.