Deck 20: Capacitors

Question 1

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

A) CR time constant
B) RC time constant
C) CR time variable
D) RC time variable

Answer 1

B

Question 2

What letter symbolizes the farad?

A) C
B) Q
C) F
D) V

Answer 2

C

Question 3

Increasing the surface area of the plates will cause the capacitance of a capacitor to .

A) decrease
B) increase
C) stay the same

Answer 3

B

Question 4

A capacitor is constructed by separating two metal conductors known as with an insulating material known as a(n) _.

A) plates; dielectric
B) dielectrics; plate
C) electrolytes; ceramic
D) ceramics; electrolyte

Question 5

The material between a capacitor's plates is rated by a value called the .

A) dielectric constant
B) magnetic constant
C) dielectric variable
D) magnetic variable

Question 6

Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in series. What is the total capacitance?

A) 6 μF
B) 62 μF

Question 7

What is a device that opposes a change of voltage?

A) an inductor
B) a capacitor
C) a diode

Question 8

Nonpolarized capacitors .

A) must be used with AC only
B) must be used with DC only
C) can be used with either AC or DC

Question 9

Two capacitors, a 20 μF and a 30 μF, are connected in series. What is the total capacitance?

A) 12 μF
B) 50 μF

Question 10

A charge curve for a capacitor is divided into time constants.

A) two
B) three
C) four
D) five

Question 11

Energy in a capacitor is stored as a(n) .

A) electrostatic charge
B) magnetic field
C) electromagnetic field
D) circulating current

Question 12

Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance?

A) 6 μF
B) 62 μF

Question 13

Two capacitors, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance?

A) 12 μF
B) 50 μF

Question 14

In a capacitor, the amount of dielectric stress is proportional to the .

A) distance between the plates
B) thickness of the dielectric
C) current flow through the capacitor
D) voltage difference between the plates

Question 15

In some capacitors, there is a small amount of current that flows from one plate, through the dielectric material to the other plate. This current is called current.

A) leakage
B) conduction
C) electrostatic
D) electrolytic

Question 16

What is the basic unit of capacitance?

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

Question 17

In a capacitor, the voltage difference between the plates controls the .

A) area of the plates
B) thickness of the dielectric
C) amount of dielectric stress
D) amount of current flow through the capacitor

Question 18

Polarized capacitors .

A) must be used with AC only
B) must be used with DC only
C) can be used with either AC or DC

Question 19

Capacitors charge and discharge at a(n) rate.

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

Question 20

A 100 μF capacitor and a 3.6 k Ω resistor are connected in series. How long will it take for the capacitor to change its charge completely?

A) 1.8 s
B) 2.3 s
C) 3.8 s
D) 4.3 s

Question 21

Polarized capacitors are also known as capacitors.

A) bipolar
B) variable
C) electrolytic
D) electroplated

Question 22

The JAN standard is used to mark a capacitor intended for .

A) industrial
B) civilian
C) military
D) laboratory

Question 23

Variable capacitors normally have a dielectric of .

A) air
B) mica
C) Teflon
D) glass

Question 24

The indicates the amount of capacitance change with temperature.

Question 25

A HIPOT is a test set used to test capacitor .

A) capacitance
B) dielectric
C) leads
D) tolerance