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?

<p>3 Phase Induction Motor (B)</p> Signup and view all the answers

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

<p>Restorative Maintenance (C)</p> Signup and view all the answers

What does Protective Maintenance aim to prevent?

<p>Breakdowns and failures (B)</p> Signup and view all the answers

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

<p>To support the stator core and the field winding (B)</p> Signup and view all the answers

Which material is commonly used to make the stator frame?

<p>Cast iron (B)</p> Signup and view all the answers

What is the main purpose of laminating the stator core?

<p>To reduce eddy current loss (B)</p> Signup and view all the answers

What are the stator windings typically made of in a 3 phase induction motor?

<p>Insulated copper wires with varnish or insulated bars with strips of cotton (D)</p> Signup and view all the answers

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

<p>One for each phase (B)</p> Signup and view all the answers

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

<p>Star or Delta connection (C)</p> Signup and view all the answers

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

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

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

<p>To generate a rotating magnetic field (A)</p> Signup and view all the answers

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

<p>To prevent short circuits and ensure proper insulation (C)</p> 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?

<p>To provide protection and mechanical strength to all inner parts (A)</p> Signup and view all the answers

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