Deck 17: Capacitance

Question 1

Some variable capacitors use mica, ceramic, or plastic film as the dielectric and are often called ______________ capacitors.

Answer 1

trimmer

Question 2

The ______________ rating specifies the maximum potential difference that can be applied across the plates without puncturing the dielectric.

Answer 2

voltage

Question 3

If a(n) ______________ capacitor is connected with the incorrect polarity, it may become hot and explode.

Answer 3

electrolytic

Question 4

Capacitors are used in ______________ to provide a higher working voltage rating for the combination.

Question 5

A ______________ meter is a piece of test equipment specifically designed to measure the capacitance value of capacitors.

Question 6

) Dielectric ______________ is the inability of a capacitor to completely discharge to zero.

Question 7

A ______________ capacitor is equivalent to a partial short circuit where the dielectric gradually loses its insulating properties.

Question 8

A capacitor consists of an insulator, also called a ______________ between two conductors.

Question 9

A capacitor can store the amount of charge necessary to provide a potential difference ______________ to the charging voltage.

Question 10

Any charge or discharge current flows through the conducting wires to the plates but not through the ______________.

Question 11

Trimmer capacitors have values

A) less than 100 pF
B) more than 100 pF
C) less than 0.50 pF
D) more than 100 ?F

Question 12

When two or three capacitor sections of a tuning capacitor are configured on one common shaft, the capacitor sections are said to be

A) linked
B) networked
C) ganged
D) common

Question 13

A rating that specifies the maximum potential difference that can be applied across the plates without puncturing the dielectric is the

A) breakdown voltage
B) breakover voltage
C) maximum reverse voltage
D) voltage rating

Question 14

Which of the following is not a feature of the tantalum electrolytic capacitor?

A) Larger C in a smaller size
B) Longer shelf life
C) Less leakage current
D) Less expensive than aluminum

Question 15

What type capacitor is most often used for coupling and bypassing ac signals?

A) Ceramic disk
B) Film-type
C) Aluminum electrolytic
D) Tantalum electrolytic

Question 16

When determining the capacitance and tolerance of a mica capacitor, if the tolerance colored dot is gold, what is the tolerance of the capacitor?

A) 5%
B) 10%
C) 1%
D) 2%

Question 17

What type capacitors have a body that is one solid color, such as tan and the end electrodes completely enclose the end of the part?

A) Tantalum
B) Mica
C) Chip
D) Film

Question 18

When the circuit's total capacitance is equal to the sum of the individual capacitances, the capacitors are connected in

A) series
B) parallel
C) series-parallel
D) series with a resistor

Question 19

Connecting capacitances in series is equivalent to

A) increasing the thickness of the dielectric
B) adding the plate areas
C) decreasing the space between the plates
D) increasing the plate size

Question 20

The electric energy stored in a dielectric is

A) directly proportional to capacitance
B) inversely proportional to capacitance
C) inversely proportional to voltage across the capacitor
D) not related to the value of capacitance

Question 21

Stored energy greater than how many joules can be dangerous and could produce an electric shock?

A) 0.25 J
B) 0.5 J
C) 1.0 J
D) 0.75 J

Question 22

What piece of test equipment is specifically designed to measure the capacitance value of capacitors?

A) Ohmmeter
B) Farad tester
C) Capacitance meter
D) Reactance meter

Question 23

Which of the following is not a leakage path through which a capacitor might discharge?

A) Through dielectric
B) Across insulated case
C) Through surrounding air
D) Through capacitor leads

Question 24

What is the inability of a capacitor to completely discharge to zero?

A) Dielectric absorption
B) Dielectric diffusion
C) Capacitive reactance
D) Discharge malfunction

Question 25

A good capacitor has

A) a very low resistance
B) a very high resistance
C) zero ohms resistance
D) infinite ohms resistance

Question 26

If a capacitor-inductor analyzer is not available, a capacitor can be tested with a(n)

A) oscilloscope
B) digital voltmeter
C) analog ohmmeter
D) ammeter

Question 27

What is the ability of a dielectric to hold or store an electric charge?

A) Inductance
B) Capacitive reactance
C) Impedance
D) Capacitance

Question 28

Which of the following is not a common type of capacitor?

A) Ceramic
B) Silicon
C) Film
D) Electrolytic

Question 29

In the automobile industry capacitors are commonly called

A) condensers
B) mobile caps
C) condensation caps
D) electrolytics

Question 30

Components made to provide a specified amount of capacitance are called

A) reactors
B) capacitors
C) varistors
D) inductors

Question 31

The action of neutralizing the charge by connecting a conducting path across the dielectric is called

A) conduction
B) charging
C) discharging
D) neutralization

Question 32

When one coulomb is stored in the dielectric with a potential difference of one volt, the capacitance is

A) 1 pF
B) 1 ?F
C) 1 mF
D) 1 F

Question 33

What is the ability of a dielectric to withstand a potential difference without arcing across the insulator?

A) Dielectric strength
B) Insulator integrity
C) Barrier potential
D) Field strength

Question 34

Surface-mount capacitors are often called

A) mica capacitors
B) electrolytic capacitors
C) chip capacitors
D) condensers

Question 35

Capacitance is the ability of a dielectric to hold or store an electric charge.

Question 36

A capacitor consists of a conductor between two insulators.

Question 37

In the electronics industry capacitors are generally referred to as condensers.

Question 38

Charging a capacitor involves a voltage source redistributing some electrons from one side of the capacitor to the other.

Question 39

The capacitor has opposite charges because of electrostatic induction by the electric field.

Question 40

The action of neutralizing the charge by connecting a conducting path across the dielectric is called charging the capacitor.

Question 41

Any charge or discharge current flows through the conducting wires to the plates but not through the dielectric.

Question 42

When one coulomb is stored in the dielectric with a potential difference of one volt, the capacitance is one farad.

Question 43

Capacitors are always coded in either pF or ?F units but never in nF.

Question 44

The result of a larger plate area is less charge stored for the same applied voltage, which means that the capacitance is smaller.

Question 45

The capacitance of a capacitor is determined only by its physical construction and not by external circuit parameters such as frequency or voltage.

Question 46

Dielectric strength is the ability of a dielectric to withstand a potential difference without arcing across the insulator.

Question 47

Electrolytic capacitors use molecular-thin oxide film as the dielectric, resulting in large capacitance in little space.

Question 48

Mica capacitors are often used for large capacitance values of about 100 to 5000 ?F.

Question 49

Film capacitors are very temperature-stable and are therefore used frequently in circuits that require very stable capacitance values.