Test 11

Question 1

The ________ prevents flow of electrons through a capacitor

Answer 1

Dielectric

Question 2

Why does the smallest capacitor in a series circuit have the largest voltage drop?

Answer 2

It charges fastest

Question 3

Assume 2 unequal capacitors are connected across a voltage source which will have the larger voltage across it?

Answer 3

The smaller capacitor

Question 4

4 capacitor types

Answer 4

Variable
Fixed
Polarized
Non polarized

Question 5

Fixed capacitor

Answer 5

Capacitance determined by manufacture

Question 6

Define capacitance

Answer 6

Capacity of a circuit or circuit component to store electrical charge

Question 7

Capacitance is measured in

Answer 7

Farads: micro farads or pico farads

Question 8

Capacitors are always labeled in __________ unless stated otherwise

Answer 8

Pico

Question 9

For a dc circuit with a series resistor, capacitor and switch when is the current at its maximum

Answer 9

Right after switch is closed

Question 10

Ceramic capacitor

Answer 10

Non polarized
Small size
High capacitance

Question 11

Capacitors build voltage to ________ circuit applied voltage

Answer 11

Oppose

Question 12

Variable capacitor

Answer 12

Plate area can be adjusted

Question 13

What precautions are necessary when using a polarized capacitor

Answer 13

Check polarity and voltage rating

Question 14

The dielectric is a ___________ material

Answer 14

Insulating

Question 15

4 main types of fixed capacitors

Answer 15

Mica
Ceramic
Electrolytic
Plastic film

Question 16

When a capacitor is charging does current flow through the dielectric

Answer 16

No

Question 17

Working voltage

Answer 17

The maximum sustained DC voltage a capacitor can withstand

Question 18

What is relative permeability

Answer 18

Effectiveness of a given dielectric to that of air

Question 19

Mica capacitor

Answer 19

Small size with high working voltage

Question 20

After the first time constant how charged is a capacitor

Answer 20

63 percent

Question 21

What is an electrolyte

Answer 21

A conductive material in which charge movement is by ions

Question 22

For constant dc a capacitor is equivalent to an _________ .

Answer 22

Open circuit

Question 23

What does the band on one end of a plastic film capacitor indicate

Answer 23

The outside foil

Question 24

How do you find capacitance in parallel

Answer 24

Sum all capacitors

Question 25

C

Answer 25

Capacitance in farads F

Question 26

Capacitance is

Answer 26

The ability to store voltage

Question 27

Q

Answer 27

Charge in coulombs

Question 28

When the plate area of a capacitor is increased capacitance ________.

Answer 28

Increases

Question 29

Capacitance is directly proportional to the _________ and _______

Answer 29

Relative dielectric constant and plate area

Question 30

Coulombs equation

Answer 30

Q = C X V

Question 31

What type of dielectric is in a electrolytic capacitor

Answer 31

An extremely thin layer of oxide

Question 32

Plastic film capacitor

Answer 32

Non polarized with a large plate area | Small size with high capacitance

Question 33

Capacitance ____________ voltage

Answer 33

Opposes

Question 34

Electrolytic capacitor

Answer 34

Very high capacitance they are polarized

Question 35

What are 3 factors that determine capacitance of a capacitor

Answer 35

Area of the plates Separation of the plates Dielectric

Question 36

As spacing between plates increases capacitance _______ and voltage _________

Answer 36

Decreases | Increases

Question 37

In a RC circuit current _______ voltage by ______ degrees

Answer 37

Leads 90

Question 38

Non polarized capacitor

Answer 38

Used in AC and dc without regard to electrical polarity

Question 39

Capacitors and current: | Current ________ voltage by _______ degrees

Answer 39

Leads | 90

Question 40

Polarized capacitor

Answer 40

Definite positive and negative connection points for dc circuits

Question 41

Relative permeability of:

Answer 41

``` Air 1 Teflon 2 Paper 2.5 Oil 4 Mica 5 Glass 7.5 Aluminum oxide 10 Ceramic 1200 ```

Question 42

Time constant equation

Answer 42

T = r x c

Question 43

What are two types of electrolytic capacitors

Answer 43

Aluminum and tantalum

Question 44

WV is?

Answer 44

Working voltage

Question 45

How is a charge stored in a capacitor?

Answer 45

Electrostatic field

Question 46

Capacitance is inversely proportional to __________

Answer 46

distance between the plates

Question 47

How do you find capacitance in series

Answer 47

Reciprocal equation