WorksheetsThe mighty motor video questions
Total questions: 10
Worksheet time: 6mins
Name three materials that the frame can be made from
Sheet steel
Cast iron
Cast aluminium
Copper
What material are the stator and rotor laminations made from?
Polycor steel
Aluminium
Copper
Ferrite
Why are laminations used in the stator and rotor?
To increase hysteresis
To reduce hysteresis
To reduce eddy currents
To increase eddy currents
What is meant by the ‘IP’ rating?
Increased protection
Ingress protection
Item portabilty
Internal protection
Why are the stator and rotor laminations heated in an inert atmosphere and then exposed to air?
To remove surface oxidation
To harden the surfaces
To reduce surface oxidation
To oxidise their surfaces, and to anneal the metal
What are the stator coils made from?
Aluminium
Bare copper wire
Enamelled copper wire
Steel wire
How is overheating of the stator detected?
By embedding thermistors in the windings
By embedding resistors in the windings
By embedding transistors in the windings
By embedding flux capacitors in the windings
What electrical tests are applied to the stator?
Resistivity
Phase rotation
Continuity
Insulation resistance
What is the cage constructed of?
Aluminium
Steel
Copper
Iron
How is vibration of the rotor minimised?
By balancing the stator
By balancing the rotor
Reducing the length of the rotor
Reducing the diameter of the rotor
