Question 1

How long does it take to fully charge a 5 µF capacitor in series with a 5 MΩ resistor?

Accepted Answer

A)  25 seconds 
B)  125 milliseconds 
C)  125 seconds 
D)  125 microseconds 
A)  25 seconds 
B)  125 milliseconds 
C)  125 seconds 
D)  125 microseconds

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 0.022 µF __________

Accepted Answer

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

Question 3

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 0.001 µF __________

Accepted Answer

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

Question 4

Why are capacitors used as coupling components in many ac circuits?

Accepted Answer

A)  because the dielectric has a high dc resistance 
B)  because they pass ac and block dc 
C)  because they pass dc and block ac 
D)  both A and B 
A)  because the dielectric has a high dc resistance 
B)  because they pass ac and block dc 
C)  because they pass dc and block ac 
D)  both A and B

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 0.002 µF __________

Accepted Answer

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

Question 6

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 7

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 8

Figure 12-1
-All dielectrics are made from conducting material.

Accepted Answer

A) True 
 B)False

Question 9

-Calculate the reactance of the capacitor if it has a value 1.0 µF and the frequency is 10 kHz.

Accepted Answer

A)  159.0 Ω 
B)  198.75 Ω 
C)  227.87 Ω 
D)  15.9 Ω 
A)  159.0 Ω 
B)  198.75 Ω 
C)  227.87 Ω 
D)  15.9 Ω

Question 10

Figure 12-2
-What is the maximum DC voltage that can safely be applied to the circuit in Figure 12-2?

Accepted Answer

A)  100 V 
B)  185 V 
C)  50 V 
D)  35 V 
A)  100 V 
B)  185 V 
C)  50 V 
D)  35 V

Question 11

Energy is stored in a capacitor in a magnetic field, concentrated in the dielectric.

Accepted Answer

A) True 
 B)False

Question 12

Figure 12-4
-The charge of a capacitor is:

Accepted Answer

A)  on the bottom plate only 
B)  on the top plate only. 
C)  on both plates 
D)  in the dielectric. 
A)  on the bottom plate only 
B)  on the top plate only. 
C)  on both plates 
D)  in the dielectric.

Question 13

If an open capacitor is checked with an analog ohmmeter, the meter should show:

Accepted Answer

A)  infinity 
B)  zero 
C)  movement from zero to infinity 
D)  movement from infinity to zero 
A)  infinity 
B)  zero 
C)  movement from zero to infinity 
D)  movement from infinity to zero

Question 14

Write the word or phrase that best completes each statement or answers the question.
Complete the following tables: Frequency = 60 Hz
-Capacitance Reactance 100 pF __________

Accepted Answer

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

Question 15

-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 have the higher reactance?

Accepted Answer

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

Question 16

If the distance between the plates of a capacitor is increased, the capacitance _ .

Accepted Answer

A)  remains the same 
B)  increases 
C)  decreases 
D)  can't tell with information given 
A)  remains the same 
B)  increases 
C)  decreases 
D)  can't tell with information given

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 10 pF __________

Accepted Answer

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

Question 18

Figure 12-1
-The main disadvantage of an electrolytic capacitor is:

Accepted Answer

A)  low voltage values 
B)  low leakage current 
C)  high leakage current 
D)  low capacitance values 
A)  low voltage values 
B)  low leakage current 
C)  high leakage current 
D)  low capacitance values

Question 19

Figure 12-1
-A capacitor has a capacitance of 0.1 µF with air as the dielectric. If the dielectric material is changed from air to a ceramic material with a dielectric constant of 600, what is the new capacitance? Note: Neither air nor Ceramic capacitors this large are available.)

Accepted Answer

A)  6.28 µF 
B)  600 µF 
C)  60 µF 
D)  0.006 µF 
A)  6.28 µF 
B)  600 µF 
C)  60 µF 
D)  0.006 µF

Question 20

If three capacitors with values of 33 µF, 40 µF and 88 µF were connected in parallel, what is the total capacitance?

Accepted Answer

A)  53.7 µF 
B)  15 µF 
C)  102.1 µF 
D)  161 µF 
A)  53.7 µF 
B)  15 µF 
C)  102.1 µF 
D)  161 µF

Exam 12: Capacitors

How long does it take to fully charge a 5 µF capacitor in series with a 5 MΩ resistor?

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 0.022 µF __________

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 0.001 µF __________

Why are capacitors used as coupling components in many ac circuits?

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 0.002 µF __________

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 __________

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 -All dielectrics are made from conducting material.

-Calculate the reactance of the capacitor if it has a value 1.0 µF and the frequency is 10 kHz.

Figure 12-2 -What is the maximum DC voltage that can safely be applied to the circuit in Figure 12-2?

Energy is stored in a capacitor in a magnetic field, concentrated in the dielectric.

Figure 12-4 -The charge of a capacitor is:

If an open capacitor is checked with an analog ohmmeter, the meter should show:

Write the word or phrase that best completes each statement or answers the question. Complete the following tables: Frequency = 60 Hz -Capacitance Reactance 100 pF __________

-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 have the higher reactance?

If the distance between the plates of a capacitor is increased, 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 10 pF __________

Figure 12-1 -The main disadvantage of an electrolytic capacitor is:

Figure 12-1 -A capacitor has a capacitance of 0.1 µF with air as the dielectric. If the dielectric material is changed from air to a ceramic material with a dielectric constant of 600, what is the new capacitance? Note: Neither air nor Ceramic capacitors this large are available.)

If three capacitors with values of 33 µF, 40 µF and 88 µF were connected in parallel, what is the total capacitance?

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

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Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

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Introduction to Alternating Current and Voltage

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Rlc Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

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