Electric Machines IM Equivalent Circuit Quiz
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Questions and Answers

What is the rotor speed of the motor at the rated voltage and frequency?

  • 1720 rpm
  • 1754 rpm
  • 1772 rpm (correct)
  • 1790 rpm

    • What is the total power loss in the motor?

  • 2800 W (correct)
  • 3800 W
  • 2400 W
  • 1800 W

    • What is the power converted by the motor?

  • 18100 W
  • 19100 W
  • 16100 W (correct)
  • 14100 W

    • What is the efficiency of the motor?

    <p>85.7%</p> Signup and view all the answers

    What is the air-gap power of the motor?

    <p>16100 W</p> Signup and view all the answers

    What is the torque produced by the motor?

    <p>82.7 Nm</p> Signup and view all the answers

    What is the stator to rotor effective turns ratio of the given induction motor?

    <p>1.2</p> Signup and view all the answers

    What is the type of induction motor being referred to in the problem?

    <p>Y-connected</p> Signup and view all the answers

    What is the frequency of the supply voltage in the first part of the problem?

    <p>50 Hz</p> Signup and view all the answers

    What is the purpose of the DC test in the given problem?

    <p>To determine the motor's winding resistance</p> Signup and view all the answers

    What is the significance of the maximum torque occurring at a certain slip in an induction motor?

    <p>It determines the motor's starting torque</p> Signup and view all the answers

    In an induction motor, what is the speed of the stator magnetic field?

    <p>120 𝑓 𝑟𝑒𝑣𝑜𝑙𝑢𝑡𝑖𝑜𝑛/𝑚𝑖𝑛 𝑛 𝑃</p> Signup and view all the answers

    What is the purpose of the locked-rotor test in the given problem?

    <p>To determine the motor's rotor resistance and inductance</p> Signup and view all the answers

    In an induction motor, what is the torque produced dependent on?

    <p>Stator magnetic field and rotor velocity</p> Signup and view all the answers

    What is the purpose of the transformer equivalent circuit in an induction motor?

    <p>To model the motor's behavior</p> Signup and view all the answers

    What is the power factor of a 480-V 60-Hz, 50-hp, three-phase induction motor that is drawing 60 A at 0.85 PF lagging?

    <p>0.85 lagging</p> Signup and view all the answers

    How is the efficiency of an induction motor affected by the stator copper losses and rotor copper losses?

    <p>It decreases with an increase in stator copper losses and rotor copper losses</p> Signup and view all the answers

    What is the full-load slip of a 208-V 10-hp, four-pole, 60-Hz, Y-connected induction motor?

    <p>5 percent</p> Signup and view all the answers

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