Question 1

If a   capacitor is connected to a 15 V 400 Hz source, its current equals ________.

Accepted Answer

A) 55 mA 
B) 829 mA 
C) 18.1 mA 
D) 1.81 A 
A) 55 mA 
B) 829 mA 
C) 18.1 mA 
D) 1.81 A

Question 2

If a   capacitor operates at 220 kHz, XC equals ________.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 3

At what frequency is a   capacitor operating if its reactance is

Accepted Answer

A) 3.54 MHz 
B) 3.54 kHz 
C) 354 kHz 
D) 35.4 kHz 
A) 3.54 MHz 
B) 3.54 kHz 
C) 354 kHz 
D) 35.4 kHz

Question 4

The time constant for a capacitor for each time period is:

Accepted Answer

A) 63% of the increase in value. 
B) a constant factor. 
C) 37% of the decrease in value. 
D) all of these. 
A) 63% of the increase in value. 
B) a constant factor. 
C) 37% of the decrease in value. 
D) all of these.

Question 5

The voltage rating of a capacitor indicates the voltage it will charge up to.

Accepted Answer

A) True 
 B)False

Question 6

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 7

In a capacitive AC circuit, the phase relationship between the voltage and the current is such that the:

Accepted Answer

A) current is 180 degrees out of phase with voltage. 
B) current is leading the voltage. 
C) voltage is leading the current. 
D) voltage is 360 degrees out of phase with current. 
A) current is 180 degrees out of phase with voltage. 
B) current is leading the voltage. 
C) voltage is leading the current. 
D) voltage is 360 degrees out of phase with current.

Question 8

If the dc working voltage of a capacitor is 100 V, the dielectric must withstand ________.

Accepted Answer

A) 85 VRMS 
B) 75 VRMS 
C) 100 VDC 
D) 220 VPP 
A) 85 VRMS 
B) 75 VRMS 
C) 100 VDC 
D) 220 VPP

Question 9

Efficient filtering is directly related to RC time constant.

Accepted Answer

A) True 
 B)False

Question 10

Electrolytic capacitors differ from many other capacitors in construction in that they are:

Accepted Answer

A) polarized. 
B) larger. 
C) smaller. 
D) sensitized. 
A) polarized. 
B) larger. 
C) smaller. 
D) sensitized.

Question 11

A capacitor can fully charge in one time constant.

Accepted Answer

A) True 
 B)False

Question 12

At what frequency is a   capacitor operating if its reactance is

Accepted Answer

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

Question 13

When connecting a large electrolytic capacitor to a circuit with a   source, place the negative end of the capacitor ________.

Accepted Answer

A) towards the negative side of the source 
B) towards the positive side of the source 
C) in either position; the polarity is not important 
A) towards the negative side of the source 
B) towards the positive side of the source 
C) in either position; the polarity is not important

Question 14

If four   capacitors are connected in parallel,   equals ________.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 15

How long will it take a   capacitor to fully charge through a   resistor?

Accepted Answer

A) 235 ms 
B) 2.35 s 
C) 0.235 ms 
D) 23.5 ms 
A) 235 ms 
B) 2.35 s 
C) 0.235 ms 
D) 23.5 ms

Question 16

If a   capacitor are connected in series,   is less than ________.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 17

How long will it take to completely charge a   capacitor through a 1   resistor?

Accepted Answer

A) 0.029 s 
B) 0.047 s 
C) 0.235 s 
D) 0.47 s 
A) 0.029 s 
B) 0.047 s 
C) 0.235 s 
D) 0.47 s

Question 18

If an uncharged capacitor, a resistor, a switch and a 12 V battery are connected in series, at approximately what time will the capacitor reach full charge?

Accepted Answer

A) 12 × R × C 
B) R × C 
C) 5 × R × C 
D) The time cannot be predicted. 
A) 12 × R × C 
B) R × C 
C) 5 × R × C 
D) The time cannot be predicted.

Question 19

If a   capacitor is connected to a 20 V, 400 Hz source, the current is ________.

Accepted Answer

A) 0.851 A 
B) 2.36 A 
C) 8.51 A 
D) 425 A 
A) 0.851 A 
B) 2.36 A 
C) 8.51 A 
D) 425 A

Question 20

If a   and   capacitor are connected in parallel across a 20 V source, the total capacitance equals   and each capacitor drops

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Exam 9: Branch, Loop, and Node Analyses

If a capacitor is connected to a 15 V 400 Hz source, its current equals ________.

If a capacitor operates at 220 kHz, XC equals ________.

At what frequency is a capacitor operating if its reactance is

The time constant for a capacitor for each time period is:

The voltage rating of a capacitor indicates the voltage it will charge up to.

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

In a capacitive AC circuit, the phase relationship between the voltage and the current is such that the:

If the dc working voltage of a capacitor is 100 V, the dielectric must withstand ________.

Efficient filtering is directly related to RC time constant.

Electrolytic capacitors differ from many other capacitors in construction in that they are:

A capacitor can fully charge in one time constant.

At what frequency is a capacitor operating if its reactance is

When connecting a large electrolytic capacitor to a circuit with a source, place the negative end of the capacitor ________.

If four capacitors are connected in parallel, equals ________.

How long will it take a capacitor to fully charge through a resistor?

If a capacitor are connected in series, is less than ________.

How long will it take to completely charge a capacitor through a 1 resistor?

If an uncharged capacitor, a resistor, a switch and a 12 V battery are connected in series, at approximately what time will the capacitor reach full charge?

If a capacitor is connected to a 20 V, 400 Hz source, the current is ________.

If a and capacitor are connected in parallel across a 20 V source, the total capacitance equals and each capacitor drops

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

RC Circuits

RL Circuits

RlC Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters