Question 1

The unit of measurement of capacitance is called a(n)____.

Accepted Answer

A)  ohm ($\Omega$) 
B)  farad (F) 
C)  henry (H) 
D)  volt (V) 
A)  ohm ($\Omega$) 
B)  farad (F) 
C)  henry (H) 
D)  volt (V) B

Question 2

What is the relationship of current and voltage in a purely capacitive circuit?

Accepted Answer

A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$out of phase with each other. 
D)  The current and voltage are in phase with each other. 
A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$out of phase with each other. 
D)  The current and voltage are in phase with each other. B

Question 3

What electrical quantity is used to measure inductance?

Accepted Answer

A)  Farad 
B)  Coulomb 
C)  Hertz 
D)  Henry 
A)  Farad 
B)  Coulomb 
C)  Hertz 
D)  Henry D

Question 4

An inductor with an inductive reactance of 48  $\Omega$is connected in parallel with a 32  $\Omega$ resistor. What is the total impedance of this circuit?

Accepted Answer

A)  80  $\Omega$ 
B)  19.2  $\Omega$ 
C)  26.6  $\Omega$ 
D)  57.7  $\Omega$ 
A)  80  $\Omega$ 
B)  19.2  $\Omega$ 
C)  26.6  $\Omega$ 
D)  57.7  $\Omega$

Question 5

The phase separation between the three single-phase AC sine waves in three-phase AC is ____.

Accepted Answer

A)  0° 
B)  45° 
C)  90° 
D)  120° 
A)  0° 
B)  45° 
C)  90° 
D)  120°

Question 6

When dealing with capacitors, the insulating material is called a dielectric.

Accepted Answer

A) True 
 B)False

Question 7

What statement could be made concerning the phase angle in a circuit containing a small resistor and a large inductive reactance?

Accepted Answer

A)  The phase angle will be 0$\degree$. 
B)  The phase angle will be greater than 0$\degree$ but less than 45$\degree$. 
C)  The phase angle will be greater than 45$\degree$but less than 90$\degree$. 
D)  The phase angle will be 90$\degree$. 
A)  The phase angle will be 0$\degree$. 
B)  The phase angle will be greater than 0$\degree$ but less than 45$\degree$. 
C)  The phase angle will be greater than 45$\degree$but less than 90$\degree$. 
D)  The phase angle will be 90$\degree$.

Question 8

A 100 µF capacitor is connected to a 120 V, 60 Hz power line. What is the capacitive reactance of this circuit?

Accepted Answer

A)  0.04  $\Omega$ 
B)  43.7  $\Omega$ 
C)  26.54  $\Omega$ 
D)  94.2  $\Omega$ 
A)  0.04  $\Omega$ 
B)  43.7  $\Omega$ 
C)  26.54  $\Omega$ 
D)  94.2  $\Omega$

Question 9

What is the relationship of current and voltage in a purely inductive circuit?

Accepted Answer

A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$out of phase with each other. 
D)  The current and voltage are in phase with each other. 
A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$out of phase with each other. 
D)  The current and voltage are in phase with each other.

Question 10

Total opposition to current in a circuit that contains a combination of resistance and reactance is called ____.

Accepted Answer

A)  resistance 
B)  impedance 
C)  VARs 
D)  reactance 
A)  resistance 
B)  impedance 
C)  VARs 
D)  reactance

Question 11

Two ___________________ in close proximity that are separated by some type of insulating material form a device called a capacitor

Accepted Answer

The answer of Two ___________________ in close proximity that are...

Question 12

Most electrical power used in industry is single-phase AC.

Accepted Answer

A) True 
 B)False

Question 13

What is the relationship between current and voltage in a purely resistive circuit?

Accepted Answer

A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$ out of phase with each other. 
D)  The current and voltage are in phase with each other. 
A)  The current lags the voltage by 90$\degree$. 
B)  The current leads the voltage by 90$\degree$. 
C)  The current and voltage are 180$\degree$ out of phase with each other. 
D)  The current and voltage are in phase with each other.

Question 14

When AC is applied across a capacitor, a ____ phase shift exists between the circuit current and capacitor voltage.

Accepted Answer

A)  45$\degree$ 
B)  60$\degree$ 
C)  63.2$\degree$ 
D)  90$\degree$ 
A)  45$\degree$ 
B)  60$\degree$ 
C)  63.2$\degree$ 
D)  90$\degree$

Question 15

A circuit contains resistance and inductance connected in series. The resistor has a true power of 560 W. The inductor has a reactive power of 430 VARs. What is the power factor of this circuit?

Accepted Answer

A)  79.3% 
B)  76.8% 
C)  60.9% 
D)  83% 
A)  79.3% 
B)  76.8% 
C)  60.9% 
D)  83%

Exam 17: Reactive Circuits and Power Factor

The unit of measurement of capacitance is called a(n)____.

What is the relationship of current and voltage in a purely capacitive circuit?

What electrical quantity is used to measure inductance?

An inductor with an inductive reactance of 48 Ω\OmegaΩ is connected in parallel with a 32 Ω\OmegaΩ resistor. What is the total impedance of this circuit?

The phase separation between the three single-phase AC sine waves in three-phase AC is ____.

When dealing with capacitors, the insulating material is called a dielectric.

What statement could be made concerning the phase angle in a circuit containing a small resistor and a large inductive reactance?

A 100 µF capacitor is connected to a 120 V, 60 Hz power line. What is the capacitive reactance of this circuit?

What is the relationship of current and voltage in a purely inductive circuit?

Total opposition to current in a circuit that contains a combination of resistance and reactance is called ____.

Two ___________________ in close proximity that are separated by some type of insulating material form a device called a capacitor

Most electrical power used in industry is single-phase AC.

What is the relationship between current and voltage in a purely resistive circuit?

When AC is applied across a capacitor, a ____ phase shift exists between the circuit current and capacitor voltage.

A circuit contains resistance and inductance connected in series. The resistor has a true power of 560 W. The inductor has a reactive power of 430 VARs. What is the power factor of this circuit?

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An inductor with an inductive reactance of 48 $\Omega$ is connected in parallel with a 32 $\Omega$ resistor. What is the total impedance of this circuit?