WorksheetsQuiz on AC Machines
Total questions: 10
Worksheet time: 5mins
Which components in DC machines need to be replaced or re-conditioned due to wear?
Stator and rotor
Commutator and brushes
Bearings and shafts
Windings and coils
What is the characteristic of an asynchronous motor?
Rotates faster than the supply
Rotates slower than the supply
Rotates in time with the supply
Does not rotate
What does the alternating supply create in the stator coils of a synchronous motor?
Static magnetic field
Rotating magnetic field
Pulsating magnetic field
Constant magnetic field
What happens to synchronous motors if they do not run at synchronous speed?
They accelerate.
They stall.
They reverse direction.
They increase torque.
Why are synchronous motors not self-starting?
Due to their rotor design
Due to their stator design
Because they are too heavy
Because they have no windings
Which component of the motor is directly affected by the applied supply?
Rotor
Stator
Commutator
Armature
What is one advantage of a wound rotor compared to a cage rotor?
Lower starting torque
Higher starting torque
Simpler design
Lower efficiency
What component is used to add external resistances to the rotor windings in a wound rotor?
Gears
Belts
Slip rings/brushes
Pulleys
In the diagram, which component is directly connected to the slip rings?
Stator
External resistors
Wound rotor
Line
What is a universal motor?
A motor that operates only on solar power
A commutated series-wound motor
A motor that operates only on wind power
A motor that does not require any power supply
