Question 1

Power factor (PF) is the ratio of the _____ power to the _____ power.

Accepted Answer

A)  true; apparent 
B)  apparent; true 
C)  apparent; reactive 
D)  reactive; apparent 
A)  true; apparent 
B)  apparent; true 
C)  apparent; reactive 
D)  reactive; apparent A

Question 2

In a series RL circuit, ET = 120 V, R = 30 Ω , and XL = 40 Ω . What is the apparent power?

Accepted Answer

A)  17.92 VA 
B)  172.8 VA 
C)  230.4 VA 
D)  288 VA 
A)  17.92 VA 
B)  172.8 VA 
C)  230.4 VA 
D)  288 VA D

Question 3

A series RL circuit has two resistors and two inductors. The resistors dissipate 7 W and 12 W. The inductive powers are 15 VARs and 8 VARs. The applied voltage is 240 V. How much is the circuit current?

Accepted Answer

A)  8.045 A 
B)  10.43 A 
C)  19.83 A 
D)  22.63 A 
A)  8.045 A 
B)  10.43 A 
C)  19.83 A 
D)  22.63 A A

Question 4

Of the different power values in an RL circuit, which one is known as apparent power?

Accepted Answer

A)  VA 
B)  VARs 
C)  W 
A)  VA 
B)  VARs 
C)  W

Question 5

A series RL circuit contains two resistors. The resistors are 33 Ω and 47 Ω . When calculating the circuit values, the total resistance used is _____.

Accepted Answer

A)  56 Ω 
B)  60 Ω 
C)  68 Ω 
D)  80 Ω 
A)  56 Ω 
B)  60 Ω 
C)  68 Ω 
D)  80 Ω

Question 6

Of the different power values in an RL circuit, which one is known as quadrature power?

Accepted Answer

A)  VA 
B)  W 
C)  VARs 
A)  VA 
B)  W 
C)  VARs

Question 7

A series RL circuit has a resistance of 270 Ω and an inductive reactance of 155 Ω . How many degrees is angle theta ( ∠θ )?

Accepted Answer

A)  4.97 ° 
B)  5.03 ° 
C)  10.14 ° 
D)  29.86 ° 
A)  4.97 ° 
B)  5.03 ° 
C)  10.14 ° 
D)  29.86 °

Question 8

In a series RL circuit, the angle between the voltage and current is called angle theta ( ∠θ ). The cosine of the angle is equal to the _____.

Accepted Answer

A)  watts 
B)  power factor 
C)  VARs 
D)  volt-amperes 
A)  watts 
B)  power factor 
C)  VARs 
D)  volt-amperes

Question 9

Dividing a circuit's total applied voltage by the total impedance results in the total _____.

Accepted Answer

A)  current 
B)  power 
C)  VA 
D)  VARs 
A)  current 
B)  power 
C)  VA 
D)  VARs

Question 10

Of the different power values in an RL circuit, which one is known as wattless power?

Accepted Answer

A)  VA 
B)  VARs 
C)  W 
A)  VA 
B)  VARs 
C)  W

Question 11

In a series RL circuit, ET = 120 V, R = 40 Ω , and XL = 30 Ω . What is ER?

Accepted Answer

A)  72 V 
B)  88.57 V 
C)  96 V 
D)  151.43 V 
A)  72 V 
B)  88.57 V 
C)  96 V 
D)  151.43 V

Question 12

In a series circuit, the total _____ is equal to the sum of the individual resistors.

Accepted Answer

A)  current 
B)  amperage 
C)  voltage 
D)  resistance 
A)  current 
B)  amperage 
C)  voltage 
D)  resistance

Question 13

You connect a clamp-on ammeter and a voltmeter to a series RL circuit powered by a 60-Hz circuit. The voltage reads 120 V and the current is 0.715 A. The resistor is 150 Ω . What is the true power?

Accepted Answer

A)  65.8 W 
B)  76.68 W 
C)  86 W 
D)  167.83 W 
A)  65.8 W 
B)  76.68 W 
C)  86 W 
D)  167.83 W

Question 14

A series RL circuit contains two resistors and two inductors. The resistors are 27 Ω and 47 Ω . The inductors have inductive reactances of 50 Ω and 40 Ω . The applied voltage is 120 V. What is the voltage drop on the inductor that has 40 Ω of reactance?

Accepted Answer

A)  28.41 V 
B)  41.2 V 
C)  51.5 V 
D)  67.81 V 
A)  28.41 V 
B)  41.2 V 
C)  51.5 V 
D)  67.81 V

Question 15

In a series RL circuit ET = 120 V, R = 150 Ω , and XL = 270 Ω . What is the reactive power?

Accepted Answer

A)  36.62 VARs 
B)  40.75 VARs 
C)  42.64 VARs 
D)  53.39 VARs 
A)  36.62 VARs 
B)  40.75 VARs 
C)  42.64 VARs 
D)  53.39 VARs

Question 16

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . Angle theta is _____.

Accepted Answer

A)  48.37 ° 
B)  52.27 ° 
C)  63.97 ° 
D)  72.55 ° 
A)  48.37 ° 
B)  52.27 ° 
C)  63.97 ° 
D)  72.55 °

Question 17

A series RL circuit contains two resistors and two inductors. The resistors are 43 Ω and 54 Ω . The inductors have inductive reactances of 70 Ω and 40 Ω . The total impedance is _____.

Accepted Answer

A)  52.15 Ω 
B)  67.20 Ω 
C)  84.94 Ω 
D)  146.66 Ω 
A)  52.15 Ω 
B)  67.20 Ω 
C)  84.94 Ω 
D)  146.66 Ω

Question 18

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . The applied voltage is 120 V. What is the voltage drop on the 33 Ω resistor?

Accepted Answer

A)  32.89 V 
B)  46.84 V 
C)  55 V 
D)  60 V 
A)  32.89 V 
B)  46.84 V 
C)  55 V 
D)  60 V

Question 19

In a series RL circuit, ET = 120 V, R = 40 Ω , and XL = 30 Ω . How much is EL?

Accepted Answer

A)  72 V 
B)  78.57 V 
C)  86 V 
D)  91.43 V 
A)  72 V 
B)  78.57 V 
C)  86 V 
D)  91.43 V

Question 20

In a series RL circuit, ET = 120 V, R = 500 Ω , and XL = 500 Ω . What is the true power?

Accepted Answer

A)  8.8 W 
B)  14.4 W 
C)  17.2 W 
D)  20.36 W 
A)  8.8 W 
B)  14.4 W 
C)  17.2 W 
D)  20.36 W

Exam 18: Resistive Inductive Series Circuits

Power factor (PF) is the ratio of the _____ power to the _____ power.

In a series RL circuit, ET = 120 V, R = 30 Ω , and XL = 40 Ω . What is the apparent power?

A series RL circuit has two resistors and two inductors. The resistors dissipate 7 W and 12 W. The inductive powers are 15 VARs and 8 VARs. The applied voltage is 240 V. How much is the circuit current?

Of the different power values in an RL circuit, which one is known as apparent power?

A series RL circuit contains two resistors. The resistors are 33 Ω and 47 Ω . When calculating the circuit values, the total resistance used is _____.

Of the different power values in an RL circuit, which one is known as quadrature power?

A series RL circuit has a resistance of 270 Ω and an inductive reactance of 155 Ω . How many degrees is angle theta ( ∠θ )?

In a series RL circuit, the angle between the voltage and current is called angle theta ( ∠θ ). The cosine of the angle is equal to the _____.

Dividing a circuit's total applied voltage by the total impedance results in the total _____.

Of the different power values in an RL circuit, which one is known as wattless power?

In a series RL circuit, ET = 120 V, R = 40 Ω , and XL = 30 Ω . What is ER?

In a series circuit, the total _____ is equal to the sum of the individual resistors.

You connect a clamp-on ammeter and a voltmeter to a series RL circuit powered by a 60-Hz circuit. The voltage reads 120 V and the current is 0.715 A. The resistor is 150 Ω . What is the true power?

A series RL circuit contains two resistors and two inductors. The resistors are 27 Ω and 47 Ω . The inductors have inductive reactances of 50 Ω and 40 Ω . The applied voltage is 120 V. What is the voltage drop on the inductor that has 40 Ω of reactance?

In a series RL circuit ET = 120 V, R = 150 Ω , and XL = 270 Ω . What is the reactive power?

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . Angle theta is _____.

A series RL circuit contains two resistors and two inductors. The resistors are 43 Ω and 54 Ω . The inductors have inductive reactances of 70 Ω and 40 Ω . The total impedance is _____.

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . The applied voltage is 120 V. What is the voltage drop on the 33 Ω resistor?

In a series RL circuit, ET = 120 V, R = 40 Ω , and XL = 30 Ω . How much is EL?

In a series RL circuit, ET = 120 V, R = 500 Ω , and XL = 500 Ω . What is the true power?

Atomic Structure

Electrical Quantities and Ohm S Law

Static Electricity

Magnetism

Resistors

Series Circuits

Parallel Circuits

Combination Circuits

Kirchhoff S Laws Thevenin S Norton S and Superposition Theorems

Measuring Instruments

Using Wire Tables and Determining Conductor Sizes

Conduction in Liquids and Gases

Batteries and Other Sources of Electricity

Magnetic Induction

Basic Trigonometry and Vectors

Alternating Current

Inductance in Ac Circuits

Resistive Inductive Parallel Circuits

Capacitors

Capacitance in Ac Circuits

Resistive Capacitive Series Circuits

Resistive Capacitive Parallel Circuits

Resistive Inductive Capacitive Series Circuits

Resistive Inductive Capacitive Parallel Circuits

Filters

Three Phase Circuits

Single Phase Transformers

Three Phase Transformers

Dc Generators

Dc Motors

Three Phase Alternators

Three Phase Motors

Single Phase Motors

Harmonics

Filters

Power factor (PF) is the ratio of the _ power to the _ power.

In a series RL circuit, E_T = 120 V, R = 30 Ω , and X_L = 40 Ω . What is the apparent power?

In a series RL circuit, E_T = 120 V, R = 40 Ω , and X_L = 30 Ω . What is E_R?

In a series RL circuit E_T = 120 V, R = 150 Ω , and X_L = 270 Ω . What is the reactive power?

In a series RL circuit, E_T = 120 V, R = 40 Ω , and X_L = 30 Ω . How much is E_L?

In a series RL circuit, E_T = 120 V, R = 500 Ω , and X_L = 500 Ω . What is the true power?