TEST BANK
Electrical Wiring Industrial, 18th
Edition by Stephen L. Herman
Complete Chapter Test Bank are
included (Ch 1 to 20)
** Immediate Download
** Swift Response
** All Chapters included
,Table of Contents are given below
1. Plans and Sitework.
2. The Unit Substation.
3. Feeder Bus System.
4. Panelboards.
5. Trolley Busways.
6. Using Wire Tables and Determining Conductor Sizes.
7. Signaling Systems.
8. Basic Motor Controls.
9. Motors and Controllers.
10. Motor Installation.
11. Power Factor.
12. Ventilating, Air Conditioning, and Other Facilities.
13. System Protection.
14. Lightning Protection.
15. Site Lighting.
16. Programmable Logic Controllers.
17. Developing a Program for a PLC.
18. Fiber Optics.
19. Hazardous Locations.
20. Harmonics.
,The test bank is organized in reverse order, with the last chapter displayed first, to ensure that all chapters are
included in this document. (Complete Chapters included Ch20-1)
Chapter 20: Harmonics
1. Harmonics are voltages or currents that operate at a frequency that is _____ the fundamental power frequency.
a. a multiple of
b. a divisor of
c. within 10 Hz of
d. within 100 Hz of
ANSWER: a
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 12:59 AM
DATE MODIFIED: 6/5/2023 12:59 AM
2. Harmonics are produced by loads that draw current in _____.
a. a sine wave
b. a linear manner
c. a continuous manner
d. pulses
ANSWER: d
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 12:59 AM
DATE MODIFIED: 6/5/2023 1:00 AM
3. In order to produce a constant voltage signal from a bridge rectifier, a _____ is used to smooth the pulsations.
a. resistor
b. inductor
c. diode
d. capacitor
ANSWER: d
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:00 AM
DATE MODIFIED: 6/5/2023 1:01 AM
4. Harmonics called _____ have a zero sequence.
a. positives
b. negatives
c. doublens
Page 1
, Name: Class: Date:
Chapter 20: Harmonics
d. triplens
ANSWER: d
POINTS: 1
REFERENCES: Harmonic Effects
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:01 AM
DATE MODIFIED: 6/5/2023 1:02 AM
5. Which of the following is a source of three-phase harmonics?
a. variable-frequency motor drives
b. complex resistor networks
c. rectifier smoothing capacitors
d. series resonant circuits
ANSWER: a
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:02 AM
DATE MODIFIED: 6/5/2023 1:02 AM
6. The third harmonic of a 50 Hz fundamental power frequency would be _____ Hz.
a. 50
b. 120
c. 150
d. 100
ANSWER: c
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:03 AM
DATE MODIFIED: 6/5/2023 1:03 AM
7. In transformers, harmonic currents can lead to heating problems caused by eddy currents and _____ losses.
a. inductive
b. capacitive
c. hysteresis
d. resistive
ANSWER: c
POINTS: 1
REFERENCES: Harmonic Effects
Page 2
Electrical Wiring Industrial, 18th
Edition by Stephen L. Herman
Complete Chapter Test Bank are
included (Ch 1 to 20)
** Immediate Download
** Swift Response
** All Chapters included
,Table of Contents are given below
1. Plans and Sitework.
2. The Unit Substation.
3. Feeder Bus System.
4. Panelboards.
5. Trolley Busways.
6. Using Wire Tables and Determining Conductor Sizes.
7. Signaling Systems.
8. Basic Motor Controls.
9. Motors and Controllers.
10. Motor Installation.
11. Power Factor.
12. Ventilating, Air Conditioning, and Other Facilities.
13. System Protection.
14. Lightning Protection.
15. Site Lighting.
16. Programmable Logic Controllers.
17. Developing a Program for a PLC.
18. Fiber Optics.
19. Hazardous Locations.
20. Harmonics.
,The test bank is organized in reverse order, with the last chapter displayed first, to ensure that all chapters are
included in this document. (Complete Chapters included Ch20-1)
Chapter 20: Harmonics
1. Harmonics are voltages or currents that operate at a frequency that is _____ the fundamental power frequency.
a. a multiple of
b. a divisor of
c. within 10 Hz of
d. within 100 Hz of
ANSWER: a
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 12:59 AM
DATE MODIFIED: 6/5/2023 12:59 AM
2. Harmonics are produced by loads that draw current in _____.
a. a sine wave
b. a linear manner
c. a continuous manner
d. pulses
ANSWER: d
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 12:59 AM
DATE MODIFIED: 6/5/2023 1:00 AM
3. In order to produce a constant voltage signal from a bridge rectifier, a _____ is used to smooth the pulsations.
a. resistor
b. inductor
c. diode
d. capacitor
ANSWER: d
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:00 AM
DATE MODIFIED: 6/5/2023 1:01 AM
4. Harmonics called _____ have a zero sequence.
a. positives
b. negatives
c. doublens
Page 1
, Name: Class: Date:
Chapter 20: Harmonics
d. triplens
ANSWER: d
POINTS: 1
REFERENCES: Harmonic Effects
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:01 AM
DATE MODIFIED: 6/5/2023 1:02 AM
5. Which of the following is a source of three-phase harmonics?
a. variable-frequency motor drives
b. complex resistor networks
c. rectifier smoothing capacitors
d. series resonant circuits
ANSWER: a
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:02 AM
DATE MODIFIED: 6/5/2023 1:02 AM
6. The third harmonic of a 50 Hz fundamental power frequency would be _____ Hz.
a. 50
b. 120
c. 150
d. 100
ANSWER: c
POINTS: 1
REFERENCES: Introduction
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
DATE CREATED: 6/5/2023 1:03 AM
DATE MODIFIED: 6/5/2023 1:03 AM
7. In transformers, harmonic currents can lead to heating problems caused by eddy currents and _____ losses.
a. inductive
b. capacitive
c. hysteresis
d. resistive
ANSWER: c
POINTS: 1
REFERENCES: Harmonic Effects
Page 2
