Three Phase And Single Phase Motors Flashcards
A single phase capacitor start induction motor has which of the following?
A squirrel cage motor
In a single phase capacitor start induction motor, the centrifugal switch is used to?
Disconnect the start winding when the motor is almost up to full speed
A three phase induction motor with four poles, supplied from a 400V 50HZ supply, which of the following speeds is most likely to rotate?
1440 RPM
Which of the following describes the synchronous speed of an induction motor?
The speed of the rotating magnetic field in the stator
The twisting effect produced by the shaft of a motor is called?
Torque
A single phase motor hums but fails to start, one practicle test is to check for is?
Continuity of the stator windings
To reverse the direction of a three phase, six terminal induction motors, it is necessary to change?
Two of the three line conductors
Electric motors convert?
Electrical to mechanical energy
The type of rotary used in single and three phase motors is?
A squirrel cage
In a capacitor start induction run motor he start winding is removed from the supply when the motor is up to speed using?
A centrifugal switch
The rotar in single or three phase motors is laminated in order to?
Minimise the effects t of eddy currents
A three phase induction motor is connected to a 400V 50HZ supply. The magnetic field rotates at 1500 RPM, therefore the motor is?
A 4 pole machine
Kn a three phase induction motor the rotating magnetic field is achieved by?
Energizing the stator coils from a three phase supply
The three phase squirrel cage induction motor is the most commonly used in AC motors because?
Its simple construction and low cost
Current is made to flow in the rotor bars of a squirrel cage rotor by?
Electromagnetic induction from the stator field
