Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Transformer Lesson 1

Magnetism and Electromagnetism

QuestionAnswer
1) ? is a force that acts at a distance and is caused by a magnetic field. A. Magnetism
2 ) A(n) ? is easily magnetized. C. ferromagnetic material
3) A ? can hold its magnetism for a long period of time. A. permanent magnet
4) All magnets have a north and south pole. A. True
5) Unlike magnetic poles attract. A. True
6) The force of attraction between two magnets decreases as the distance between the magnets increases. A. True
7) A material is magnetic if it has ? . D. organized molecular magnets so that the individual fields add together
8) Permanent magnets might be demagnetized by a sharp blow. A. True
9) Permanent magnets might be demagnetized by extreme cold. B. False
10) ? is magnetism produced when electricity passes through a conductor. A. Electromagnetism
11) The left-hand rule can be used to determine the polarity of a coil. A. True
12) ? is the amount of magnetomotive force distributed over the length of a magnet. B. Magnetic field intensity
13) Match the magnetic unit of measure that it is analogous (similar in some respect) to. Magnetomotive Force = Voltage Field Flux = Current Reluctance = Resistance
14) Permeability is a measure of the ability of a material to conduct magnetic flux. A. True
15) The reference permeability of pure iron is 6,000 – 8,000; this means it has the ability to conduct magnetic flux better than copper. A. True
16) Copper is a ferromagnetic material. B. False
17) Cobalt is a ferromagnetic material. A. True
18) Nickel is a ferromagnetic material. A. True
19) Given the information in the Relative Permeability Chart, ? should be used as a transformer core to get the highest flux density for a given input before saturation occur. D. Pure Iron
20) Magnetic permeability is nonlinear. A. True
21) Saturation is where a magnetic core has substantially all the magnetic domains aligned with the field and any increases in current no longer result in a stronger electromagnet. A. True
22) When a magnetic circuit reaches a point of saturation, ? . C. Further increases in flux density are not possible
23) On a graph of a normal magnetization curve, which properties are represented on the two axes. A. I. and II.
24) Each normal magnetization curve, or B-H curve, has a knee where increases in the field strength no longer have much effect on the magnetic flux density. As more magnetic flux gets forced into the same area, more magnetic domains are available... B. False
25) Transformers are normally operated at the point of saturation. B. False
Created by: kwineinger13
Popular Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards