Question 1

Upon checking the voltage output of a power supply with an oscilloscope, you notice an unusually large amount of ripple. What could possibly be the problem?

Accepted Answer

A) shorted filter capacitor 
B) open filter capacitor 
C) shorted load 
D) either B or C 
A) shorted filter capacitor 
B) open filter capacitor 
C) shorted load 
D) either B or C D

Question 2

If four 0.022 µF capacitors are connected in parallel, CT equals .

Accepted Answer

A) 0.088 µF 
B) 0.022 µF 
C) 0.044 µF 
D) 0.049 µF 
A) 0.088 µF 
B) 0.022 µF 
C) 0.044 µF 
D) 0.049 µF A

Question 3

What is the capacitance that stores 1.175 µC of charge and drops 25 V?

Accepted Answer

A) 0.047 µF 
B) 47 µF 
C) 4.7 µF 
D) 0.47 µF 
A) 0.047 µF 
B) 47 µF 
C) 4.7 µF 
D) 0.47 µF A

Question 4

Capacitance is the ability to store voltage.

Accepted Answer

A) True 
 B)False

Question 5

Electrolytic capacitors must be connected into a circuit such that:

Accepted Answer

A) reversal of polarity does not happen. 
B) voltage rating marked is not exceeded. 
C) positive lead to positive voltage; negative lead to negative voltage. 
D) all of these. 
A) reversal of polarity does not happen. 
B) voltage rating marked is not exceeded. 
C) positive lead to positive voltage; negative lead to negative voltage. 
D) all of these.

Question 6

How much charge is stored in a 0.47 µF capacitor that drops 18 V?

Accepted Answer

A) 8.46 µC 
B) 846 µC 
C) 0.846 µC 
D) 84.6 µC 
A) 8.46 µC 
B) 846 µC 
C) 0.846 µC 
D) 84.6 µC

Question 7

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the larger voltage.

Accepted Answer

A) True 
 B)False

Question 8

If the distance between the plates of a capacitor increases, the capacitance decreases.

Accepted Answer

A) True 
 B)False

Question 9

If a 1 µF, 2.2 µF and 0.05 µF capacitor are connected in series, CT is less than _ .

Accepted Answer

A) 0.05 µF 
B) 2.2 µF 
C) 0.001 µF 
D) 1 µF 
A) 0.05 µF 
B) 2.2 µF 
C) 0.001 µF 
D) 1 µF

Question 10

To find the total capacitance of two capacitors in parallel, you must combine them using a similar procedure as resistors in parallel.

Accepted Answer

A) True 
 B)False

Question 11

Reactive power (Pr)in a capacitor is defined as the rate at which a capacitor stores or returns energy and is measured in:

Accepted Answer

A) volt -ampere reactive. 
B) current per time constant. 
C) watts reactive. 
D) volts per time constant. 
A) volt -ampere reactive. 
B) current per time constant. 
C) watts reactive. 
D) volts per time constant.

Question 12

How long will it take for a 22 µF capacitor to completely charge through a 47 kΩ resistor?

Accepted Answer

A) 8.272 s 
B) 2.068 s 
C) 1.034 s 
D) 5.17 s 
A) 8.272 s 
B) 2.068 s 
C) 1.034 s 
D) 5.17 s

Question 13

When two capacitors are connected in series across a dc source, the smallest capacitor drops the largest voltage.

Accepted Answer

A) True 
 B)False

Question 14

What is one time constant of a 47 µF capacitor in series with a 120 kΩ resistor?

Accepted Answer

A) 54.6 s 
B) 5.64 s 
C) 564 ms 
D) 0.564 ms 
A) 54.6 s 
B) 5.64 s 
C) 564 ms 
D) 0.564 ms

Question 15

If a 4.7 µF capacitor and a 10 kΩ resistor are connected in series across 25 VDC, approximately how much voltage will the resistor drop after charging for just one time constant?

Accepted Answer

A) 15.8 V 
B) 21.6 V 
C) 9.20 V 
D) 23.8 V 
A) 15.8 V 
B) 21.6 V 
C) 9.20 V 
D) 23.8 V

Question 16

How long will it take for a 22 µF capacitor to completely discharge through a 4.7 kΩ resistor?

Accepted Answer

A) 0.827 s 
B) 0.207 s 
C) 0.517 s 
D) 0.103 s 
A) 0.827 s 
B) 0.207 s 
C) 0.517 s 
D) 0.103 s

Question 17

What is the capacitance of a capacitor that drops 50 V and stores 0.500 µC of charge?

Accepted Answer

A) 0.01 µF 
B) 0.001 µF 
C) 1 µF 
D) 0.1 µF 
A) 0.01 µF 
B) 0.001 µF 
C) 1 µF 
D) 0.1 µF

Question 18

With three capacitors in series, the current lags the voltage by:

Accepted Answer

A) 30 degrees. 
B) 45 degrees. 
C) 90 degrees. 
D) none of the above. 
A) 30 degrees. 
B) 45 degrees. 
C) 90 degrees. 
D) none of the above.

Question 19

A 65 Vrms signal is applied to a 10 F capacitor. What is the total peak current?

Accepted Answer

A) 6.5 A 
B) 153 mA 
C) 6.5 kA 
D) not enough information 
A) 6.5 A 
B) 153 mA 
C) 6.5 kA 
D) not enough information

Question 20

At what frequency is a 2000 pF capacitor operating if its reactance is 745 Ω?

Accepted Answer

A) 1.01 kHz 
B) 10.1 kHz 
C) 1010 Hz 
D) 107 kHz 
A) 1.01 kHz 
B) 10.1 kHz 
C) 1010 Hz 
D) 107 kHz

Upon checking the voltage output of a power supply with an oscilloscope, you notice an unusually large amount of ripple. What could possibly be the problem?

If four 0.022 µF capacitors are connected in parallel, CT equals .

What is the capacitance that stores 1.175 µC of charge and drops 25 V?

Capacitance is the ability to store voltage.

Electrolytic capacitors must be connected into a circuit such that:

How much charge is stored in a 0.47 µF capacitor that drops 18 V?

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the larger voltage.

If the distance between the plates of a capacitor increases, the capacitance decreases.

If a 1 µF, 2.2 µF and 0.05 µF capacitor are connected in series, CT is less than _ .

To find the total capacitance of two capacitors in parallel, you must combine them using a similar procedure as resistors in parallel.

Reactive power (Pr)in a capacitor is defined as the rate at which a capacitor stores or returns energy and is measured in:

How long will it take for a 22 µF capacitor to completely charge through a 47 kΩ resistor?

When two capacitors are connected in series across a dc source, the smallest capacitor drops the largest voltage.

What is one time constant of a 47 µF capacitor in series with a 120 kΩ resistor?

If a 4.7 µF capacitor and a 10 kΩ resistor are connected in series across 25 VDC, approximately how much voltage will the resistor drop after charging for just one time constant?

How long will it take for a 22 µF capacitor to completely discharge through a 4.7 kΩ resistor?

What is the capacitance of a capacitor that drops 50 V and stores 0.500 µC of charge?

With three capacitors in series, the current lags the voltage by:

A 65 Vrms signal is applied to a 10 F capacitor. What is the total peak current?

At what frequency is a 2000 pF capacitor operating if its reactance is 745 Ω?

Systems, Quantities, and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Rccircuits

Inductors

Rlcircuits

Rlccircuits and Resonance

Transformers

Time Response of Reactive Circuits

Filters

Exam 9: Capacitors

Upon checking the voltage output of a power supply with an oscilloscope, you notice an unusually large amount of ripple. What could possibly be the problem?

If four 0.022 µF capacitors are connected in parallel, CT equals .

What is the capacitance that stores 1.175 µC of charge and drops 25 V?

Capacitance is the ability to store voltage.

Electrolytic capacitors must be connected into a circuit such that:

How much charge is stored in a 0.47 µF capacitor that drops 18 V?

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the larger voltage.

If the distance between the plates of a capacitor increases, the capacitance decreases.

If a 1 µF, 2.2 µF and 0.05 µF capacitor are connected in series, CT is less than _ .

To find the total capacitance of two capacitors in parallel, you must combine them using a similar procedure as resistors in parallel.

Reactive power (Pr)in a capacitor is defined as the rate at which a capacitor stores or returns energy and is measured in:

How long will it take for a 22 µF capacitor to completely charge through a 47 kΩ resistor?

When two capacitors are connected in series across a dc source, the smallest capacitor drops the largest voltage.

What is one time constant of a 47 µF capacitor in series with a 120 kΩ resistor?

If a 4.7 µF capacitor and a 10 kΩ resistor are connected in series across 25 VDC, approximately how much voltage will the resistor drop after charging for just one time constant?

How long will it take for a 22 µF capacitor to completely discharge through a 4.7 kΩ resistor?

What is the capacitance of a capacitor that drops 50 V and stores 0.500 µC of charge?

With three capacitors in series, the current lags the voltage by:

A 65 Vrms signal is applied to a 10 F capacitor. What is the total peak current?

At what frequency is a 2000 pF capacitor operating if its reactance is 745 Ω?

Systems, Quantities, and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Rccircuits

Inductors

Rlcircuits

Rlccircuits and Resonance

Transformers

Time Response of Reactive Circuits

Filters