DC and AC motors

Electric

An_________ motor is a device that changes electric power to mechanical energy

Series, Shunt, Compound

What are the three types of DC motors according to the relationship between the field coil connections and the armature winding ?

Constant speed motor

The shunt motor is often called ?

Right hand rule

By using the___________ you can determine the direction in which a current-carrying conductor in a magnetic field tends to move

Electromotive force

What does emf stand for?

Counter electromotive force

CEMF stands for ?

Net EMF

Applied EMF - CEMF = ?

Applied

CEMF opposes the_________ voltage

By changing the polarity

How can the direction of a dc electric motor be changed ?

Weak springs

Arcing at the brushes and burning of the commutator may be caused by ?

Series

What motor is used on engine starters because of its high starting torque ?

True

As the armature of a shunt motor gains speed the armature current will decrease because of the CEMF, and the field current will increase

2 multiple choice options

Where precise speed control is needed

DC motors on A/C are used in which systems ?

Sand paper

To seat new brushes in a motor what is used ?

Stator, Rotor(Armature), Commutator, Brushes

What are the essential parts of a motor ?

Circulation of eddy currents

The laminated iron core used for the armature is laminated to reduce ?

Armature reaction

What causes a distortion in the magnetic field of a motor/generator ?

Neutral plane

What is the position where the plane of the two opposite coil is perpendicular to the magnetic field of the motor/generator ?

Interpole

A pole piece used in a DC motor to counter the effects of armature reaction.

Attract

Conductors carrying current in the same direction tend to_______ each other

Repel

Conductors carrying current in opposite directions tend to________ each other

Commutator

The part of a motor which changes the current from one wire to another is called ?

Armature

The commutator of a motor is a part of the_________ assembly

Split field motor

A motor with two field windings wound in opposite direction to allow for different directions of armature rotation.

Induction, Synchronous, Universal

What are the three basic types of AC motors ?

Induction

The most popular type of AC motor in use is ?

Armature

The rotor of an electric motor

Flying apart

May happen to a series wound motor with no load

Field windings

Reversing the connections on the armature or the__________ will change the rotation direction

Induction

Aircraft systems use synchronous and__________ motors

limit switches

limits travel on a reversible motor

ATA code

24- electrical power

Synchronous

Type of motor, speed is in sync with the input voltage/frequency