16 Questions
What is the main purpose of restorative (repairs) maintenance?
To correct faults and carry out repairs
Which type of maintenance involves scheduled maintenance actions for the prevention of breakdowns and failures?
Protective Maintenance
What is another name for Restorative (Repairs) Maintenance?
Corrective Maintenance
What is the most widely used motor in three-phase AC operation?
3 Phase Induction Motor
Which type of maintenance has the disadvantage of waste of valuable energy?
Restorative Maintenance
What does Protective Maintenance aim to prevent?
Breakdowns and failures
What is the main function of the stator frame in a 3 phase induction motor?
To support the stator core and the field winding
Which material is commonly used to make the stator frame?
Cast iron
What is the main purpose of laminating the stator core?
To reduce eddy current loss
What are the stator windings typically made of in a 3 phase induction motor?
Insulated copper wires with varnish or insulated bars with strips of cotton
What are the three groups of windings used for in a 3 phase induction motor?
One for each phase
Which type of connection can be used for the three phase windings in a 3 phase induction motor?
Star or Delta connection
What does the rotor of a three phase induction motor consist of?
A cylindrical laminated core with parallel slots to carry conductors
What is the function of the conductors in the rotor of a three phase induction motor?
To generate a rotating magnetic field
What is the purpose of using insulated slots in the stator for placing the windings?
To prevent short circuits and ensure proper insulation
Why is the use of die-cast or fabricated steel common for making the frame of a 3 phase induction motor?
To provide protection and mechanical strength to all inner parts
Explore the concept of maintenance in AC motors and its classification into restorative (repairs) maintenance. Understand the impact of maintenance on the useful life of the equipment or machine.
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