Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
everythingRF RF & Microwave Parts Database (h1) - RF Cafe

NAVPERS 10622 Chapter 20 Quiz - Transformers
Electricity - Basic Navy Training Courses

Here is the "Electricity - Basic Navy Training Courses" (NAVPERS 10622) in its entirety. It should provide one of the Internet's best resources for people seeking a basic electricity course - complete with examples worked out. See copyright. See Table of Contents.   • U.S. Government Printing Office; 1945 - 618779

 

Test your comprehension of transformer principles with this 10 question quiz.

 

 

Chapter 20 Quiz - Transformers

 

Transformer cores - RF Cafe1. How is energy transferred from the primary to the secondary of a transformer?

2. Suppose d.c. were fed into the primary of a transformer, what would happen?

3. Explain how the secondary current controls the amount of primary current?

4. A welding transformer has a one-turn secondary that delivers 400 amperes. The primary has 800 turns. What is the primary current?

5. You want to build a transformer to step-down 440 volts to 110 volts. If 2,080 turns are used on the secondary, how many turns will be used on the primary?

6. A loaded secondary draws 80 amperes at 220 volts. If the primary is 600 volts, what is the primary current?

7. A 440/110 volt transformer is designed for 1/4 volt per turn. How many turns on primary and secondary?

8. Is it absolutely correct to say that transformers ate 100 percent efficient?

9. Two losses occur in a transformer? What are they?

10. How can the losses of a transformer be reduced?

 

Return to Chapter 20


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chapter 20 Answers

Transformers

1. The magnetic flux field set up by the primary current carries the primary's energy to the secondary.

2. D.C. produces no continuous voltage of self induction, therefore a very high current would flow. The primary would burn out.

3. The secondary's flux field cancels the primary's. This reduces the Esi in the primary and adjusts primary current in exact proportions to the secondary current.

4. 1/2 ampere.

5. 8320 turns.

6. 29-1/3 amps.

7. 1,760 and 440 turns.

8. No.

9. Iron losses - hysteresis and eddy currents. Copper losses - resistance.

10. Iron, by using soft iron or silica steel in laminated form.  Copper; by shortening the length per turn, and using heavy wire. Both, by cooling entire assembly.

 

Anatech Electronics RF Microwave Filters - RF Cafe
withwave microwave devices - RF Cafe
Berkeley Nucleonics Corporation - RF Cafe
RF Superstore (RF Components) - RF Cafe
Rigol DSG5000 Microwave Generator - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com