EEE 322 Experiment 3: Load Test on an Alternator
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Questions and Answers

What is the primary purpose of adjusting the speed of the shunt-dc motor to the rated value of the alternator?

  • To ensure maximum efficiency of the alternator
  • To achieve the rated terminal voltage of the alternator (correct)
  • To maintain a constant load current
  • To regulate the field current of the alternator

    • What is the purpose of connecting the alternator stator terminals to the variable Y-connect resistive load?

  • To maintain a constant power factor
  • To test the efficiency of the alternator
  • To vary the load current in steps (correct)
  • To measure the voltage regulation of the alternator

    • What is the primary objective of performing a load test on an alternator?

  • To establish a residual flux in the field winding
  • To adjust the A.C. voltage generated at the alternator terminals
  • To determine the regulation and efficiency of the alternator (correct)
  • To determine the open-circuit characteristic of the alternator

    • What is the effect of increasing the excitation current on the generated voltage in the armature?

    <p>The generated voltage will increase</p> Signup and view all the answers

    What is the significance of keeping the speed of the shunt-dc motor constant at 1500 rpm?

    <p>To ensure a constant power output</p> Signup and view all the answers

    What is the purpose of calculating the voltage regulation of the alternator at each load current value?

    <p>To determine the percentage change in terminal voltage</p> Signup and view all the answers

    What is the purpose of Fig. 1 in the text?

    <p>To illustrate the open-circuit characteristic of an alternator</p> Signup and view all the answers

    What is the formula used to determine the efficiency of an alternator?

    <p>η = (Pout - Ploss) / Pin * 100%</p> Signup and view all the answers

    What is the significance of plotting the variation of efficiency against the armature current?

    <p>To analyze the performance of the alternator under different loads</p> Signup and view all the answers

    What is the term for the power lost in the driving motor?

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

    What is the rating of the variable rheostat used in the experiment?

    <p>1-ph, 6 kW</p> Signup and view all the answers

    What is the assumption made about the mechanical loss in the experiment?

    <p>It is constant at no and full load</p> Signup and view all the answers

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