How JustAnswer Works:

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

Ask akch2002 Your Own Question

akch2002, Engineer
Category: Homework
Satisfied Customers: 3099
Experience:  Home work expert
Type Your Homework Question Here...
akch2002 is online now
A new question is answered every 9 seconds

i need help with penn foster exams 006806 wiring havac circuits 086011

Resolved Question:

i need help with penn foster exams
006806 wiring havac circuits
086011 transformers
006807 advanced electrical work
006037 wiring electrical circuits
Submitted: 4 years ago.
Category: Homework
Expert:  akch2002 replied 4 years ago.
how many questions are there in each exam?
Customer: replied 4 years ago.


Examination Number

When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam.

Questions 1 to 20: Select the best answer to each question.
* All questions require an answer ( 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 )
* 1. What is the efficiency of a transformer that has an input of 600 VA and an output to a load of 580 VA?
A. 20 VA
B. 180 VA
C. 83.8%
D. 96.6%
2. The secondary line-to-line voltage of a three-phase Y-Y-connected transformer bank is 115 VAC. What would be the secondary line to neutral voltage?
A. 199.2 V
B. 66.4 V
C. 84.2 V
D. 50 V
* 3. Most of the transformers that you'll find in your plant are either single-phase or
A. zero-phase.
B. two-phase.
C. three-phase.
D. four-phase.
* 4. An inductor whose reactance can be varied by supplying current through a separate DC winding is called
A. a reactance tube.
B. a current transformer.
C. an autotransformer.
D. a saturable reactor.
* 5. If the turns ratio of a transformer is 4 : 1 and the incoming voltage is 120 VAC, what is the secondary voltage?
A. 30 VAC
B. 120 VAC
C. 240 VAC
D. 480 VAC
* 6. If the primary in a transformer has more turns than the secondary, the secondary has
A. lower current.
B. lower voltage.
C. higher power.
D. lower ampere-turns.
* 7. What type of transformer is used to prevent electrical noise from passing from the primary winding to the secondary winding?
A. Dry-type transformer
B. Oil-filled transformer
C. Shielded transformer
D. Delta transformer
* 8. You'll work at times with a transformer that has one winding connected in series with the other to form the equivalent of a single winding. This is called
A. a distribution transformer.
B. an electronic transformer.
C. a specialty transformer.
D. an autotransformer.
* 9. If the power in the primary circuit of a 4 : 1 transformer is 12 watts, what will be the power in the secondary of this transformer?
A. 3 watts
B. 4 watts
C. 12 watts
D. 48 watts
* 10. What would be the power in the secondary of a transformer that has a voltage of 48 VAC and a current of 2.2 A?
A. 52.8 watts
B. 105.6 watts
C. 121.8 watts
D. 212.6 watts
* 11. What is the kVA rating of a transformer that has a secondary winding that's delivering 10 amps at 480 VAC?
A. 4.8 kVA
B. 48 kVA
C. 480 kVA
D. 4800 kVA
* 12. A basic transformer consists of two separate conductive coils wrapped around a(n) _____ core.
A. copper
B. oiled paper
C. iron
D. plastic
* 13. Three single-phase transformers, each having a secondary phase current of 10 A, are Delta-Delta-connected. The value of the secondary line current is
A. 1.73 A.
B. 17.3 A.
C. 57.8 A.
D. 578 A.
* 14. The primary current drawn by the transformer shown below will be
A. 2 A.
B. 5 A.
C. 10 A.
D. 50 A.


* 15. What special installation or maintenance requirements are needed for askarel-insulated transformers?
A. Cooling water must be supplied to the transformer core.
B. The transformer must be installed in a vault if the voltage exceeds 35,000 VAC.
C. The oil must be changed at least once a year.
D. The radiator must be installed where air can circulate and the fins must remain clean.
* 16. Typical potential transformers are used for
A. allowing the connection of low-voltage measuring instruments to high-voltage lines.
B. biasing control circuits in high-voltage circuits.
C. powering lighting systems from high-voltage feed lines.
D. powering current-sensitive relays in control circuits.
* 17. Why are high-quality transformers wound with large diameter wire?
A. To lower the hysteresis losses
B. To lower the I2R losses
C. To lower the eddy current losses
D. To lower the magnetic leakage losses
* 18. If 120 VAC is applied to a transformer with a turns ratio of 6 : 1, what type of transformer is present and what is the output voltage of the secondary?
A. Step up, 720 VAC
B. Step up, 600 VAC
C. Step down, 20 VAC
D. Step down, 60 VAC
* 19. When a load is suddenly connected to a transformer, the secondary voltage will be reduced. This drop in voltage is called transformer
A. seduction.
B. regulation.
C. excitation.
D. conductance.
* 20. What type of device is used on a distribution transformer to protect the transformer from voltage spikes?
A. A fuse
B. A pressure vent
C. A surge diverter
D. A ground shield
If you experience technical difficulty while taking this exam, wait a few minutes and follow the instructions on the FAQ.

Copyright & Terms | Privacy Policy | Terms of Use

Expert:  akch2002 replied 4 years ago.
Thanks. I have got the questions and will try to upload the answers today.
Expert:  akch2002 replied 4 years ago.

You need to spend $3 to view this post. Add Funds to your account and buy credits.
akch2002, Engineer
Category: Homework
Satisfied Customers: 3099
Experience: Home work expert
akch2002 and other Homework Specialists are ready to help you

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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
< Previous | Next >
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, 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. Diane Dallas, TX

Meet The Experts:

  • LogicPro



    Satisfied Customers:

    Expert in Java C++ C C# VB Javascript Design SQL HTML
< Last | Next >
  • LogicPro's Avatar



    Satisfied Customers:

    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany


    Satisfied Customers:

    More than 5000 online tutoring sessions.
  • Linda_us's Avatar


    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    Post Graduate Diploma in Management (MBA)
  • Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

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

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    Experience with chartered accountancy
  • Bizhelp's Avatar



    Satisfied Customers:

    Bachelors Degree and CPA with Accounting work experience
  • Seanna's Avatar



    Satisfied Customers:

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

Related Homework Questions