Homework

Homework Questions? Ask a Tutor for Answers ASAP

Get an Answer ASAP!

Homework

# 1. The total number of AC cycles completed in one second is

Customer Question
the current's A. alteration B. timing C. phase D...
1. The total number of AC cycles completed in one second is the current's
A. alteration
B. timing
C. phase
D. frequency
2. What is the real power (rounded) of a balanced, three-phase, Y-connected system that has a power
factor of 0.9, an effective line current of 50 A and a phase voltage of 200 V?
A. 90 KW
B. 15.5 KW
C. 26.9 KW
D. 9 KW
3. AC power is created by using
A. an AC motor
B. Transformers
C. Batteries
D. an AC generator
4. An AC sine wave has an RMS value of 100 V. What is the average of the waveform?
A. 92.6 V
B. 102 V
C. 80 V
D. 90 V
5. If the resistance in an AC circuit is 100 OHMS and the impedance is 120 OHMS, what is the circuit's
power factor (rounded)?
A. 0.631
B. 0.833
C. 0.707
D. 0.714
6. In order to reduce inductive reactance, what devices are normally placed on transmission or distribution
lines?
A. Shunt reactors
B. Semiconductors
C. Resistors
D. Capacitors
7. The peak value of an AC sine wave is 120 V. What is the average value (rounded)?
A. 76.3 V
B. 46.8 V
C. 84.8 V
D. 25.5 V
8. If someone told you that a certain AC circuit was a capacitive circuit, you would know that in that circuit
the current
A. and voltage are zero.
B. lags the voltage.
C. and voltage are in phase.
D. leads the voltage.
9. If the phase angle in a circuit is 45 degrees, what is the power factor of this circuit?
A. 0
B. 0.15
C. 0.707
D. 0.45
10. A technician uses an oscilloscope to measure the peak value of an AC wave. He tells you that the
voltage has a peak value of 100 V. What is the rms value of the voltage?
A. 70.7 V
B. 707 V
C. 10 V
D. 100 V
11. The duration of one cycle of AC power can be divided into degrees. How many degrees are in one-half
cycle of AC power?
A. 270°
B. 180°
C. 360°
D. 90°
12. What is the phase angle of the voltage with respect to the current in a resistive circuit?
B. 0º
C. 45º lagging
13. What is the average value of an AC voltage that has a maximum peak voltage of 80 VAC?
A. 160 VAC
B. 50.88 VAC
C. 38.31 VAC
D. 56.56 VAC
14. If plotted, the voltage or current produced by an alternator forms a curve called a
A. hertz wave.
B. pulsed wave.
C. sine wave.
D. sawtooth wave.
15. The peak value of an AC sine wave is 120 V. What is the effective value (rounded)?
A. 200 V
B. 140 V
C. 65 V
D. 85 V
16. In a certain balanced three-phase system, each line current is 5 A and each line voltage is 220 V. What
is the approximate real power, if the power factor is 0.7?
A. 1770 W
B. 154 W
C. 1100 W
D. 1334 W
17. What's the time duration of one-half cycle of AC power?
A. 1/45 S
B. 1/120 S
C. 1/60 S
D. 1/30 S
18. If a sine wave representing AC voltage has an effective value of 70 VAC, what would be the wave's
peak value?
A. 63.81 V
B. 98.98 V
C. 54.96 V
D. 70.49 V
19. An AC sine wave has an effective value of 100 V. What is the peak value of the waveform?
A. 200 V
B. 96.3 V
C. 141.4 V
D. 183 V
20. An AC circuit has both a resistor and an inductor. The total opposition to the flow of current in this
circuit is called
A. impedance.
B. resistance.
C. reactance.
D. inductance.
21. When electric power is transmitted over long distances, line losses can be reduced by generating AC
rather than DC voltage, and by transmitting
A. low voltage and low current.
B. high voltage and high current.
C. high voltage and low current.
D. low voltage and high current.
22. Another name for the Y- or wye-connected system of polyphase power is the
A. split-phase system.
B. delta system.
C. star system.
D. balanced system.
23. If a motor designed for 50 or 60 cycle operation is connected to 60 Hz current, the motor will
A. overheat and fail.
B. stall easily.
C. turn faster.
D. produce less torque.
24. What is the typical frequency of AC power in North America?
A. 120 Hz
B. 400 Hz
C. 60 Hz
D. 50 Hz
25. In a three-phase power system, the phases of each voltage are normally separated by how many time
degrees?
A. 90
B. 180
C. 120
D. 60
Submitted: 1 year ago.Category: Homework
Show More
Show Less
Answered in 23 hours by:
1/27/2016
Tutor: Martin, Physicist replied 1 year ago
Martin, Physicist
Category: Homework
Satisfied Customers: 781
Experience: 20+ years of research, engineering and teaching
Verified

Hello! What is the deadline for this work?

Tutor: Martin, Physicist replied 1 year ago

Please specify date, time and timezone. That way I'll be sure to get it done in time.

Category: Homework
Satisfied Customers: 3,040
3,040 Satisfied Customers
Experience: MIT Graduate (Math, Programming, Science, and Music)

Scott is online now

A new question is answered every 9 seconds

• Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
• Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
• 100% Satisfaction GuaranteeRate the answer you receive.

## JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

## What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

## Meet the Experts:

LogicPro

Engineer

5,672 satisfied customers

Expert in Java C++ C C# VB Javascript Design SQL HTML

Manal Elkhoshkhany

Tutor

4,549 satisfied customers

More than 5000 online tutoring sessions.

Linda_us

Finance, Accounts & Homework Tutor

3,138 satisfied customers

Post Graduate Diploma in Management (MBA)

Chris M.

M.S.W. Social Work

2,635 satisfied customers

Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)

F. Naz

Chartered Accountant

2,158 satisfied customers

Experience with chartered accountancy

Bizhelp

CPA

1,887 satisfied customers

Bachelors Degree and CPA with Accounting work experience

Seanna

Tutor

1,781 satisfied customers

3,000+ satisfied customers, all topics, A+ work

< Previous | Next >

Related Homework Questions
I need some one to answere a couple excel question. Excel
I need some one to answere a couple excel question … read more
Jason Jones
AAS Information Technology
6,316 satisfied customers
For LogicPro only: I need to develop a code using SQL for a
For LogicPro only: I need to develop a code using SQL for a cookbook database. Below are the requirements:Provide the SQL CREATE TABLE commands for the five tables in your cookbook database. Include P… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
For a list of numbers entered by the user and terminated by
For a list of numbers entered by the user and terminated by 0. Write a program to find the sum of the positive numbers and the sum of the negative numbers. Needs to be done in Raptor Program.… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
Paul's missionary work created a controversy in the church.
Paul's missionary work created a controversy in the church. what was the nature of the Jew-Gentile controversy and how did the church handle it?… read more
Master\u0027s Degree
380 satisfied customers
Will your tutors assist with an entire exam? I have the
hello, will your tutors assist with an entire exam? … read more
David L.
Bachelor\u0027s Degree
6 satisfied customers
While arguing with his neighbor, pulls out a Swiss Army
While arguing with his neighbor, Sam pulls out a Swiss Army knife with the intent of merely frightening him. Sam accidentally hits his neighbor's arm with the knife, resulting in a slight nick. Unbekn… read more
RobertJDFL
Attorney
Juris Doctorate
5 satisfied customers
Need a biography on Woodrow to include the following info:
Angela, Need a biography on Woodrow Wilson to include the following info: 1. Term of presidency and date of service, date of birth, date of death, birthplace, and family history 2. Political affiliati… read more
Seanna
Tutor
1,781 satisfied customers
Again) I have some more Algebra 1 questions for
Hello (again) I have some more Algebra 1 questions for participation.They are,What are two symbolic techniques used to solve a pair of simultaneous linear equations? Provide an example and solve it wi… read more
GLENN
Master of Mathematics
328 satisfied customers
Scenario: You notice that the grass around your house is,
Scenario: You notice that the grass around your house is brown, short, and dead. The grass around your neighbor's house is green, tall, and alive. Read more: http://www.justanswer.com/questions/1qmxi-… read more
gpcomputer2000
Bachelor's Degree
34 satisfied customers
Music exams Penn forster college 350700RR Medieval and
Music exams Penn forster college 350700RR Medieval and Renaissance Periods 1. A passage of music is marked "ritardando." The following passage is marked "a tempo." The composer is instructing the play… read more
Dr. Donna Kakonge
Doctor of Education
179 satisfied customers
Critically evaluate the key developements of the NHS by
critically evaluate the key developements of the NHS by using or appraising the social economic factors as example… read more
ec92
Substitue teacher
Master\u0027s Degree
8 satisfied customers
According to the university's website design request,
According to the university's website design request, students need to order five books, one for each of the five required courses that all students take. You need to design a program that will prompt… read more
Dr. Donna Kakonge
Doctor of Education
179 satisfied customers
Hope all is well. Need assistance on a homework assignment.
Hi, this is Brian hope all is well. Need assistance on a homework assignment. I'm coding a program in JavaScript language and need assistance in getting it to run. I have the container and code for th… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
For LogicPro only: Design your own linked list class named
For LogicPro only: Design your own linked list class named IntList in C++ to hold a series of integers. Include the following public member functions, named as shown: Member Function Description Defau… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
This an aspx.net question that has to be done in visual
Hello this an aspx.net question that has to be done in visual studio.I have the basic code but it is not working, just need corrections to be made to it. I need it by 11/18/17 Saturday… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
125 word min. :What role did Enlightenment era philosophies
125 word min. :What role did Enlightenment era philosophies and the scientific revolution play in increasing resistance to centralized monarchies? What specific groups led the resistance, and how did … read more
Master\u0027s Degree
380 satisfied customers
For LogicPro only: Need help with by Tuesday, November 21st
For LogicPro only:Need help with by Tuesday, November 21st http://wikisend.com/download/607522 /CS150Project.pdfNeed Help with by Wednesday - November 22nd http://wikisend.com/download/275956/Homework… read more
LogicPro
Engineer
Bachelor of Technology
5,672 satisfied customers
1. The McEvoy family feel that their needs and rights have
1. The McEvoy family feel that their needs and rights have not been clearly met by the intervention agency serving them and their child. Therefore, they've decided to take their case to an impartial d… read more
Dr. Donna Kakonge
Doctor of Education
179 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less