Question 1

The capacitive reactance of a capacitor is inversely proportional to the frequency, and directly proportional to the capacitance.

Accepted Answer

A) True 
 B)False

Question 2

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 1000 pF __________

Accepted Answer

The answer of Write the word or phrase that best...

Question 3

If the applied frequency is 1 kHz and the capacitance is 10 µF, calculate the capacitive reactance XC.

Accepted Answer

A)  0.063 Ω 
B)  15.9 kΩ 
C)  15.9 MΩ 
D)  15.9 Ω

Question 4

Figure 12-2
-Assuming the capacitors in Figure 12-2 are non-polarized electrolytic capacitors, what is the maximum AC rms voltage that can safely be applied to the circuit?

Accepted Answer

A)  100 V 
B)  49.5 V 
C)  24 V 
D)  35 V

Question 5

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 1.0 µF __________

Accepted Answer

The answer of Write the word or phrase that best...

Question 6

Figure 12-1
-The three capacitors in series in Figure 12-1 have an equivalent value:

Accepted Answer

A)  less than the value of the smallest capacitor 
B)  equal to the product of the three values 
C)  equal to the sum of the three values

Question 7

Figure 12-1
-A charged capacitor could be considered a voltage source.

Accepted Answer

A) True 
 B)False

Question 8

Figure 12-1
-The charge voltage across each capacitor in Figure 12-1 is inversely proportional to the size of the capacitor in microfarads.

Accepted Answer

A) True 
 B)False

Question 9

Figure 12-1
-The current through a capacitor is always maximum at the start of the first time constant.

Accepted Answer

A) True 
 B)False

Question 10

Figure 12-1
-A capacitor rated at 10,000 µF would typically have what kind of dielectric?

Accepted Answer

A)  aluminum oxide 
B)  ceramic 
C)  tantalum oxide 
D)  Both A and B are correct

Question 11

An amplifier with a switched-capacitor circuit has an input resistor value of 20K ohms. If you want the switched-capacitor to emulate a 10K ohm resistor, at what frequency must the switch be operated? The value of the capacitor is 1000pF.

Accepted Answer

A)  20KHz 
B)  100KHz 
C)  50KHz 
D)  25KHz

Question 12

Increasing the distance between the plates of a capacitor increases the capacitance.

Accepted Answer

A) True 
 B)False

Question 13

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 1000 µF __________

Accepted Answer

The answer of Write the word or phrase that best...

Question 14

-A capacitor produces a capacitive reactance of 18.086 kΩ with an applied voltage having a frequency of 400 Hz. What is the capacitor value?

Accepted Answer

A)  22 µF 
B)  0.22 µF 
C)  0.47 µF 
D)  0.022 µF

Question 15

A material with a high dielectric constant increases the capacitance.

Accepted Answer

A) True 
 B)False

Question 16

Figure 12-1
-Which capacitor in Figure 12-1 is charged to the highest voltage?

Accepted Answer

A)  C1 
B)  C2 
C)  C3

Question 17

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 0.01 µF __________

Accepted Answer

The answer of Write the word or phrase that best...

Question 18

Figure 12-1
-Which of the following capacitors is polarized and will be destroyed if connected in reverse polarity?

Accepted Answer

A)  ceramic 
B)  paper 
C)  electrolytic 
D)  mylar

Question 19

Phase relationship of voltage and current in a reactive circuit is:

Accepted Answer

A)  an in-phase relationship 
B)  dependent upon circuit current 
C)  an out-of-phase relationship 
D)  dependant upon the magnitude of the applied voltage

Question 20

-If the capacitor in Figure 12-3 is 0.1 µF and it is replaced by a 0.47 µF capacitor, which value capacitor will cause the higher circuit current?

Accepted Answer

A)  the 0.1 µF capacitor 
B)  the 0.47 µF capacitor

Exam 12: Capacitors

The capacitive reactance of a capacitor is inversely proportional to the frequency, and directly proportional to the capacitance.

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 1000 pF __________

If the applied frequency is 1 kHz and the capacitance is 10 µF, calculate the capacitive reactance XC.

Figure 12-2 -Assuming the capacitors in Figure 12-2 are non-polarized electrolytic capacitors, what is the maximum AC rms voltage that can safely be applied to the circuit?

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 1.0 µF __________

Figure 12-1 -The three capacitors in series in Figure 12-1 have an equivalent value:

Figure 12-1 -A charged capacitor could be considered a voltage source.

Figure 12-1 -The charge voltage across each capacitor in Figure 12-1 is inversely proportional to the size of the capacitor in microfarads.

Figure 12-1 -The current through a capacitor is always maximum at the start of the first time constant.

Figure 12-1 -A capacitor rated at 10,000 µF would typically have what kind of dielectric?

An amplifier with a switched-capacitor circuit has an input resistor value of 20K ohms. If you want the switched-capacitor to emulate a 10K ohm resistor, at what frequency must the switch be operated? The value of the capacitor is 1000pF.

Increasing the distance between the plates of a capacitor increases the capacitance.

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 1000 µF __________

-A capacitor produces a capacitive reactance of 18.086 kΩ with an applied voltage having a frequency of 400 Hz. What is the capacitor value?

A material with a high dielectric constant increases the capacitance.

Figure 12-1 -Which capacitor in Figure 12-1 is charged to the highest voltage?

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 0.01 µF __________

Figure 12-1 -Which of the following capacitors is polarized and will be destroyed if connected in reverse polarity?

Phase relationship of voltage and current in a reactive circuit is:

-If the capacitor in Figure 12-3 is 0.1 µF and it is replaced by a 0.47 µF capacitor, which value capacitor will cause the higher circuit current?