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

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.

Question

A ? motor is a DC motor that has the field wiring connected in parallel with the armature.
click to flip
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know

Question

The interpoles are connected in series with the ? windings.
Remaining cards (28)
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

motors II

lesson 4 DC Motors and Generators

QuestionAnswer
A ? motor is a DC motor that has the field wiring connected in parallel with the armature. shunt
The interpoles are connected in series with the ? windings. armature
? motors are used in moderate starting conditions and where constant or adjustable speed is required. Shunt
DC shunt motors can develop about ? to ? of full-load torque upon starting. 250% / 300%
With a(n) ? shunt field, the speed can be regulated by varying the field current, the armature current, or both self-excited
A ? winding is a small series field winding that improves stability of the fields while running with reduced current in the field circuit. stabilizing field
true/false DC compound motors have shared characteristics of series motors and shunt motors. true
DC ? motors are used mostly for special applications that require constant speed under load and high starting torque. compound
what are examples of a common DC compound motor DC cumulative-compounded motor and DC differential-compounded motor
true/false DC permanent-magnet motors use magnets and coils of wire for the field windings. false not coils of wire
Negative voltage regulation occurs only with ? generators. series
A DC ? -wound generator provides a source of positive and zero voltage regulation to the load. shunt
A DC ? operates on the principle that voltage is induced in a coil of wire when the coil is rotated in a magnetic field. generator
? voltage regulation occurs when the countervoltage at no load is greater than the terminal voltage at full load. Positive
When connected to 240 volts, a DC motor that has a winding resistance of 3.2 ohms at standstill draws ? . 75A
The field windings in a ? -wound generator consist of a few turns of low-resistance wire because the large load current flows through them. series
An external ? applies mechanical torque to the armature and series field circuit, which induces voltage and current in the generator. prime mover
True/false In a compound-wound generator, the series field is normally stronger than the shunt field. false the shunt filed is normally the stronger of the two
When a DC motor connected to 235 volts accelerates to a speed that generates a countervoltage of 115 volts, the total voltage in the motor is ? . 120 volts
A motor connected to 280 volts has a resistance of 7 ohms. When the motor accelerates to full speed, the counter voltage is 245 volts; the total voltage in the motor is 35 volts and the current drawn is ? . 5.0 A
true/false Connecting voltage directly to the field and armature windings of a DC motor allows the motor to produce higher torque in a smaller frame than with an AC motor. true
Interpoles reduce sparking at the ? of some DC motors. brushes
A(n) ? connects a brush to either the positive or negative terminal of the DC source. pigtails
The function of a(n) ? is to keep armature windings in the correct polarity to interact with the main fields of a motor. commutator
The ? rule gives the direction of motion for current-carrying wire interacting with a stationary magnetic field. right-hand motor
The neutral plane is ? to the field flux when there is no current in the armature. perpendicular
Torque is exerted on the ? when the plane of the armature loop is parallel to the field and the armature loop sides are at right angles to the magnetic field. armature
true/false The fields in a DC motor often change in polarity. false
When the power is removed, DC ? motors provide some self-braking and produce relatively high torque at low speeds. permanent-magnet
Created by: Yusosweet1
 

 



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