Induction Motors and AC Machines
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Questions and Answers

What is the main reason for keeping the air gap as small as possible in a three-phase induction machine?

  • To increase the magnetizing current
  • To keep the magnetizing current low (correct)
  • To increase the power consumption
  • To reduce the starting torque

    • What is the purpose of the slots in the stator of a three-phase induction machine?

  • To accommodate the three-phase windings (correct)
  • To reduce the number of phases
  • To increase the air gap
  • To accommodate the rotor

    • What is the name of the part of the induction machine that rotates?

  • Stator
  • Air gap
  • Rotor (correct)
  • Magnetizing current

    • What is the main advantage of using power electronic converters as a supply source for an induction machine?

    <p>To augment the characteristics of the machine</p> Signup and view all the answers

    What is the primary reason for the widespread use of induction machines in industries and household applications?

    <p>They offer several advantages, including being cheap and rugged</p> Signup and view all the answers

    What is the percentage of total electrical energy generated that is consumed by induction machinery?

    <p>60%</p> Signup and view all the answers

    What is unique about the starting process of an induction machine?

    <p>It is self-starting</p> Signup and view all the answers

    What is the characteristic of an induction machine that allows it to run at almost constant speed from no-load to full-load condition?

    <p>It is maintenance-free</p> Signup and view all the answers

    What is the purpose of short-circuiting the rotor winding through external resistance?

    <p>To improve the performance of the motor</p> Signup and view all the answers

    What type of machine is used for high-power applications (MW range)?

    <p>Wound rotor induction motor</p> Signup and view all the answers

    What is the purpose of the three copper rings called 'slip rings' on the rotor shaft?

    <p>To connect the rotor winding to the external resistance</p> Signup and view all the answers

    What is the spatial phase difference between the three-phase stator windings?

    <p>120∘</p> Signup and view all the answers

    What is the principle of operation of a three-phase induction motor based on?

    <p>Faraday's law of electromagnetic induction</p> Signup and view all the answers

    What is the result of supplying a balanced three-phase supply to a three-phase stator winding?

    <p>A rotating magnetic field</p> Signup and view all the answers

    What is the requirement for the rotor winding in a wound rotor induction motor?

    <p>It should be short-circuited</p> Signup and view all the answers

    What is the application of a wound rotor induction motor in wind energy generation?

    <p>As a generator</p> Signup and view all the answers

    What are the two types of rotor structures?

    <p>Squirrel cage and slip ring</p> Signup and view all the answers

    What are the slots in the stator lamination used for?

    <p>To accommodate three-phase windings</p> Signup and view all the answers

    What is the advantage of using open slots in stator design?

    <p>Lower leakage reactance</p> Signup and view all the answers

    What is the shape of the squirrel cage rotor?

    <p>Skewed</p> Signup and view all the answers

    What is the purpose of the end rings in a squirrel cage rotor?

    <p>To short the copper or aluminum bars</p> Signup and view all the answers

    What is the characteristic of the construction of a squirrel cage rotor?

    <p>Rugged and strong, requiring no maintenance</p> Signup and view all the answers

    What is the similarity between a wound rotor and a stator?

    <p>Both have three-phase windings</p> Signup and view all the answers

    How are the three-phase windings in a stator connected?

    <p>Either in star or in delta</p> Signup and view all the answers

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