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AC Motors Chapter 1 Maintenance

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Questions and Answers

What is the main purpose of restorative (repairs) maintenance?

To change oil, greasing, and tightening of the belt
To correct faults and carry out repairs (correct)
To convert electrical energy into mechanical energy
To prevent breakdowns and failures

Which type of maintenance involves scheduled maintenance actions for the prevention of breakdowns and failures?

Restorative Maintenance
Reactive Maintenance
Corrective Maintenance
Protective Maintenance (correct)

What is another name for Restorative (Repairs) Maintenance?

Corrective Maintenance (correct)
Planned Maintenance
Preventive Maintenance
Reactive Maintenance

What is the most widely used motor in three-phase AC operation?

3 Phase Induction Motor (B) Signup and view all the answers

Which type of maintenance has the disadvantage of waste of valuable energy?

Restorative Maintenance (C) Signup and view all the answers

What does Protective Maintenance aim to prevent?

Breakdowns and failures (B) Signup and view all the answers

What is the main function of the stator frame in a 3 phase induction motor?

To support the stator core and the field winding (B) Signup and view all the answers

Which material is commonly used to make the stator frame?

Cast iron (B) Signup and view all the answers

What is the main purpose of laminating the stator core?

To reduce eddy current loss (B) Signup and view all the answers

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 (D) Signup and view all the answers

What are the three groups of windings used for in a 3 phase induction motor?

One for each phase (B) Signup and view all the answers

Which type of connection can be used for the three phase windings in a 3 phase induction motor?

Star or Delta connection (C) Signup and view all the answers

What does the rotor of a three phase induction motor consist of?

A cylindrical laminated core with parallel slots to carry conductors (A) Signup and view all the answers

What is the function of the conductors in the rotor of a three phase induction motor?

To generate a rotating magnetic field (A) Signup and view all the answers

What is the purpose of using insulated slots in the stator for placing the windings?

To prevent short circuits and ensure proper insulation (C) Signup and view all the answers

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 (A) Signup and view all the answers