The rotating magnetic field of a three-phase induction motor rotates at a speed governed by...
Supply frequency
Number of stator poles
The stator magnetic field of a three-phase induction motor rotates at _____ speed.
Synchronous
At the instant of starting, a three-phase induction motor has 100% slip. When connected to a 50Hz supply the initial rotor frequency will be...
50Hz
The basic principle of operation of an induction motor relies on.
Electromagnetic induction
What is Motor Action?
Where current flows in a conductor subject to an external magnetic field which produces a force
When a conductor cuts line of force, an EMF that is induced in the armature will produce a current in what direction?
The opposite direction
What are three types of three-phase rotor?
Squirrel cage
Wound rotor
Dual cage
How is this three-phase induction motor connected?
Star connection
How is this three-phase induction motor connected?
Delta connection
What characteristic is represented by the letter A?
Starting Torque
What characteristic is represented by the letter B?
Break Torque
What characteristic is represented by the letter C?
Rated Torque
What characteristic is represented by the letter D?
Rated Speed
What characteristic is represented by the letter E?
Synchronous Speed
The field excitation of a synchronous machine is most commonly provided by what?
A D.C. Source