Final Test Cards

Question 1

How does a Zener diode work

Answer 1

Has to be reverse bias
And have a lower voltage then the source

Question 2

List 6 method used to produce electricity

Answer 2

Piezoe electric -pressure
Tribo electric- friction
Photo voltaic - light
Magneto electric- magnetism
Thermol electric- heat
Electro chemical- chemical

Question 3

How many electrons would you find in the following valence shells?
Semi conductor
Conductor
Insulator

Answer 3

Semi conductor - 4
Conductor 1-3
Insulator 5-8

Question 4

What is meant by the term line drop?

Answer 4

Voltage drop caused by resistance in the conductor

Question 5

What is meant by the term line loss?

Answer 5

Power loss caused by resistance of the conducter

Question 6

Explain Kirchoff’s current law?

Answer 6

Current in equals current out

Question 7

Explain Kirchoff voltage law

Answer 7

Algebraic sum of all voltages in a close loop is equal to zero 

Question 8

List 3 forms of ohms law

Answer 8

E=IR
I=E/R
R=E/I

Question 9

List 3 forms of power loss

Answer 9

P=IE
P=I2•R
P=E2•R

Question 10

Volts are the flow of electrons
true or false

Answer 10

False

Question 11

List 3 advantages of Edison 3 wire circuits

Answer 11

1 ( Less conductor material is required )
2 ( 2 different voltages available )
3 (less line loss, greater efficiency)

Question 12

List 4 factors that affect the resistance of a conductor

Answer 12

Length
Diameter
Temperature
Material

Question 13

What’s bigger a circular mil or a square mil

Answer 13

Square mill is bigger

Question 14

Why should the nutral of an Edison 3 wire circuit never be opened

Answer 14

Alters voltage and current in the circuit if it’s unbalanced

Question 15

List 5 characteristics of magnetic lines of force

Answer 15

Posses direction
Complete loops
Tension along there lines = smaller
Repel each other
Cannot intersect or cross

Question 16

Witch types of diagrams are most use by electrocutions

Answer 16

Schematic / Wiring

Question 17

List three reasons for meter reading errors

Answer 17

1) Meter position
2) Temperature/ humidity
3) Meter leading

Question 18

What is the ideal resistance for an ammeter
And voltmeter

Answer 18

Ammeter = low
Voltmeter = high

Question 19

What is the ideal resistance of a ammeter and voltmeter

Answer 19

Ammeter = low
Voltmeter = high

Question 20

What is meter loading

Answer 20

When a meter is added to a circuit and alters the voltage or current significantly

Question 21

What are the laws of charged bodies

Answer 21

Like charges repel, opposites attract

Question 22

What are the two most common semi conductor material used

Answer 22

Silicon or geranium

Question 23

What types of charge is associated with N type and P type material

Answer 23

N= negative
P= positive

Question 24

Do semi conductors have a negative or positive temperature coefficient

What does it mean

Answer 24

Negative
It means Temp will increase and Resistance will decrease

Question 25

How is heat dissipated from a semi conductor device such as a diode

Answer 25

Use a heat sink

Question 26

Do semi conductor have a negative or positive temperature coefficients

Answer 26

Negative Because T increases, R decreases

Question 27

How is heat dissipated from a semi conductor device such as a diode

Answer 27

Uses a heat sink

Question 28

What is meant by the frame forward bias and reverse bias

Answer 28

Forward bias = current flows in the forward direction Reverse bias = reduces current flow in diodes

Question 29

Why is the PIV rating of a diode important to no

Answer 29

So you don’t go higher then it or the diode will be forced to conduct in reverse bias

Question 30

Why is the PIV rating of a diode important to no

Answer 30

So you don’t go higher then it or the diode will be forced to conduct in reverse bias

Question 31

What is a common application for a diode for inductive loads

Answer 31

Freewheeling diode

Question 32

What are two topical ratings that come with Zener diodes

Answer 32

1) Zener voltage 2) Watt rating

Question 33

Can Zener diodes always be tested with and ohmmeter

Answer 33

Most of the time If provided the reverse bias break over voltage isn’t breached

Question 34

What happens to the depletion region when a diode is connected forward bias or reverse bias

Answer 34

Depletion zone is reduced

Question 35

List two types of damage that can occur from and electrical fault

Answer 35

Mechanical, heat damage

Question 36

What hight should you not enter a ditch

Answer 36

1.2 meters