Theory Induc And Cap

Question 1

What is inductance

Answer 1

Inductance is the property of a circuit that opposes change in current

Question 2

What is induction

Answer 2

The process where voltage is produced by the relative motion between a conductor and a magnetic field

Question 3

What is an inductor

Answer 3

An electrical component that stores energy in its magnetic field

Question 4

What affects the amount of emf generated

Answer 4

Density of flux
Length of conductor in mag field
Rate and angle which conductor cuts lines of force

Question 5

One cycle is how many alternations

Answer 5

2 one positive one negative

Question 6

Frequncy is determined by

Answer 6

Electrical cycles per second

Question 7

North america runs on what frequency

Answer 7

60 hz

Question 8

To find e max you blank e rms or e ins by sin 45

Answer 8

Divide

Question 9

To find e rms you blank emax by sin45

Answer 9

Multiply

Question 10

To find instantaneous values you blank emax by the sin of the angle your looking for

Answer 10

Multiply

Question 11

What value does a meter show

Answer 11

RMS value or root means square

Question 12

What is the effective value of a voltage sinewave

Answer 12

Value of an ac voltage that produces heat in a cct at the same rate as a dc cct

Question 13

Where does an inductor store energy

Answer 13

An electromagnetic field

Question 14

Other than a coil what are 2 common names for an inductor

Answer 14

Solenoid or reactor

Question 15

A transformer is an inductor true or false

Answer 15

True

Question 16

Examples of electrical equip that use coils

Answer 16

Transformers
Motors
Solenoids
Relay coils
Magnetic starter coils
Lighting ballasts
Line reactors for vfd

Question 17

What is induction

Answer 17

The process of producing ciltage through relative motion between a field of flux and a conductor

Question 18

What is faradays law

Answer 18

Amount of induced emf is directly proportional to rate of change of flux

Question 19

2 types of induction

Answer 19

Mutual and self

Question 20

What is lenz law

Answer 20

The polarity of any induced voltage must create a flux that opposes the current it creates

Question 21

What affects cemf in a coil

Answer 21

Inductance and rate of change of current

Question 22

Define inductance

Answer 22

Property of a cct that opposes a change in current

Question 23

What is the unit of meausurment for inductance

Answer 23

Henrys

Question 24

Capacitors are polarized or not

Answer 24

Both normally not

Question 25

Six types of non polarised capacitors

Answer 25

Air Oil Paper or tubular Plastic film Mica Ceramic

Question 26

What capacitor type is easily adjusted

Answer 26

Air

Question 27

What are oil capacitors good for

Answer 27

High current and voltage

Question 28

What is a benefit to ceramic capacitors

Answer 28

Large capacitance for their size

Question 29

Are electrolytic capacitors polarised or non

Answer 29

Both

Question 30

4 uses for capacitoors

Answer 30

Timers Rectifier smoothing and filtering Power factor correction Motor starting

Question 31

Define capacitance

Answer 31

A capacitors ability to hold an electric charge

Question 32

Capacitance is measured in what

Answer 32

Farads

Question 33

What 3 factors affect capacitance

Answer 33

Dielectric consgant of material between plates(k) Area of the plates (A) Distance between the plates (d)

Question 34

What is a dielectric constant

Answer 34

Ability for a material to store and hold charge compared to air

Question 35

What is dielectric strength

Answer 35

The max voltage that a dielectric can withstand before it begins to breakdown

Question 36

Wvdc stands for what

Answer 36

Working volts dc

Question 37

How to calculate max ac voltage from wvdc

Answer 37

Vrms=vmax x sin 45

Question 38

What is a time constant and how many does it take to get to steady value

Answer 38

Time it takes a cct value to change by 63.2% 5

Question 39

In inductance what starts at a steady value and what starts at a minimum value

Answer 39

Current minimum Voltage maximum

Question 40

What is a discharge resistor

Answer 40

A resitor wired in parralell that is used to disperse induced voltage or inductive kick across a switch

Question 41

Coulumb is the unit of measurment for what

Answer 41

Electric charge

Question 42

In a capacative circuit what starts at steady calue and what starts at minimum

Answer 42

Voltage minimum Current steady state

Question 43

What is inductive reactance

Answer 43

Opposition to current flow in a ac cct

Question 44

Does inductive reactance happen in dc

Answer 44

No

Question 45

What is capacative reactance

Answer 45

Force that limits total current in an ac cct