Deck 15: Capacitors

Question 1

The two types of electrolytic capacitors are the ____.

A) dielectric and inductance
B) positive and negative
C) capacitance and reactance
D) wet and dry

Answer 1

D

Question 2

Nonpolarized capacitors can be used in ____ circuits.

A) only AC
B) only DC
C) both AC and DC

Answer 2

C

Question 3

____ capacitors are not sensitive to polarity connection.

A) Polarized
B) Nonpolarized
C) Pulsating
D) RL

Answer 3

B

Question 4

The basic unit of capacitance is the ____.

A) coulomb
B) henry
C) impedance
D) farad

Question 5

Polarized capacitors can be in ____ circuits.

A) only AC
B) only DC
C) both AC and DC

Question 6

Capacitors charge and discharge at a(n) ____ rate.

A) arithmetic
B) exponential
C) geometric
D) linear

Question 7

Variable capacitors are generally rated in ____.

A) microfarads
B) millifarads
C) megafarads
D) picofarads

Question 8

An inductor stores energy in a(n) ____ field.

A) static
B) electrostatic
C) magnetic
D) electromagnetic

Question 9

When a capacitor becomes charged, the plate with the lack of electrons has a ____ charge.

A) neutral
B) negative
C) positive

Question 10

____ are solid state electronic devices used throughout industry to control high-current circuits.

A) Diodes
B) SCRs
C) Triacs
D) Both b and c

Question 11

Connecting capacitors in parallel has the effect of ____ the plate area of one capacitor.

A) shorting out
B) increasing
C) decreasing
D) none of the above

Question 12

Reversing the polarity of a ____-type electrolytic capacitor will permanently damage the capacitor.

A) nonpolarized
B) wet
C) dry
D) dielectric

Question 13

The advantage of ____ is that they can have very high capacitance in a small case.

A) RL capacitors
B) dielectric constants
C) electrolytic

Question 14

A U.S. military study showed that a capacitor operated at one-half its rated voltage will have a life span about ____ times longer than a capacitor operated at its rated voltage.

A) 4
B) 6
C) 8
D) 10

Question 15

Connecting capacitors in series has the effect of increasing the distance between the plates, which ____ the total capacitance of the circuit.

A) increases
B) reduces
C) shorts out
D) none of the above

Question 16

A capacitor stores energy in a(n) ____ field.

A) static
B) electrostatic
C) magnetic
D) electromagnetic

Question 17

When the voltage to the capacitor becomes too great, the dielectric breaks down and allows current to flow between the plates, resulting in the capacitor ____.

A) becoming open
B) charging
C) discharging
D) becoming shorted

Question 18

Capacitive reactance is measured in ____.

A) watts
B) volts
C) amps
D) ohms

Question 19

When a capacitor is connected to a DC circuit and the voltages across both plates are equal, the flow of electrons stops and the capacitor is ____.

A) charged
B) discharged
C) polarized
D) nonpolarized

Question 20

When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the ____ time constant.

A) RC
B) TC
C) TAU
D) CT

Question 21

The stretching of the atoms of the dielectric is called dielectric ____________________.

Question 22

Since the different materials used to make dielectrics are very important in determining the amount of capacitance a capacitor will have, these different materials are assigned a number called the dielectric ____________________.

Question 23

In a pure capacitance circuit, when the applied voltage, charge, and impressed voltage reach zero at 180 degrees, the current flow is ____ in the negative direction.

A) minimum
B) maximum
C) increasing
D) decreasing

Question 24

A ____ voltage rating for an AC capacitor indicates the peak value of voltage.

A) RL
B) DC
C) AC
D) Z

Question 25

Polarized capacitors are generally referred to as ____________________ capacitors.

Question 26

The current in a pure inductive circuit ____.

A) leads the applied voltage by 90 degrees
B) lags the applied voltage by 90 degrees
C) lags the applied voltage by 180 degrees
D) is in phase with the applied voltage

Question 27

The flow of current through the dielectric is called ____________________ current.

Question 28

The insulating material used in capacitors is called the ____________________.

Question 29

____ time constants are required to charge or discharge a capacitor.

A) 3
B) 5
C) 7
D) 9

Question 30

If the polarity of the wet type electrolytic capacitor becomes reversed, the oxide insulating film will dissolve and the capacitor will become ____________________.

Question 31

The higher the ____, the faster a capacitor will charge and discharge.

A) farads
B) frequency
C) voltage
D) amperage

Question 32

In a pure capacitive circuit, the current ____.

A) leads the applied voltage by 90 degrees
B) lags the applied voltage by 90 degrees
C) lags the applied voltage by 180 degrees
D) is in phase with the applied voltage

Question 33

There is no true power, or watts, produced in a pure ____ circuit.

A) inductive
B) resistive
C) capacitive
D) static

Question 34

A capacitor has a capacitance of one ____________________ when a change of one volt across its plates results in a movement of one coulomb.

Question 35

____________________ capacitors will have one terminal identified as positive or negative.

Question 36

____________________ are used in industrial applications for power factor correction, as well as in the start windings of many single-phase motors.

Question 37

The current in a pure resistive circuit ____.

A) leads the applied voltage by 90 degrees
B) lags the applied voltage by 90 degrees
C) lags the applied voltage by 180 degrees
D) is in phase with the applied voltage

Question 38

A good rule to remember concerning capacitors is that ____________________ can only flow during the time that a capacitor is either charging or discharging.

Question 39

The greater the surface area of the plates in a capacitor, the more ____________________ a capacitor will have.

Question 40

The energy of a capacitor is stored in the dielectric in the form of a(n) ____________________ charge.

Question 41

In a capacitor, the impressed voltage opposes the ____________________ voltage and limits the flow of current in the circuit.

Question 42

The voltage rating of a capacitor is actually the voltage rating of the ____________________.

Question 43

Reactive power is measured in ____________________.

Question 44

When running a dielectric strength test on a capacitor, a device called a(n) ____________________ is used.

Question 45

The counter-voltage developed by a capacitor is called capacitive ____________________.

Question 46

The ability of the wet type electrolytic capacitor to be shorted and then reformed is the basis for the _________________________ electrolytic capacitor.

Question 47

As a capacitor is charged, an impressed ____________________ is developed across its plates as an electrostatic charge is built up.

Question 48

HIPOT stands for ______________________________.

Question 49

To test a capacitor for ____________________, a microammeter should be connected in series with the capacitor and rated voltage applied to the circuit.

Question 50

____________________ capacitors generally contain a set of moveable plates that allow capacitance to be changed.