Power Transmission and Conductor Volume Quiz
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Questions and Answers

In power transmission, the volume of conductor required is most closely related to which of the following?

  • The volume of the conductor is proportional to square of the voltage and directly proportional to power factor of load
  • The volume of conductor required is inversely proportional to voltage and that of power factor of load
  • The volume of the conductor required is proportional to voltage only
  • The volume of the conductor is inversely proportional to the square of the voltage and directly proportional to power factor of load (correct)

    • Is there a skin effect in d.c. transmission?

  • Depends on the conductor material
  • True
  • False (correct)
  • Cannot be determined

    • If the voltage in a constant efficiency transmission is increased n times, what happens to the size of the conductor?

  • Increased to n2 that of the original (correct)
  • Increased to n times that of the original
  • Reduced to 1/n that of the original
  • Reduced to 1/n2 that of the original

    • Is the percentage regulation of a transmission line inversely proportional to the square of the voltage?

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

    In a distribution system, if synchronous capacitors are used for improving the power factor, where is the correct location for them?

    <p>At the receiving end</p> Signup and view all the answers

    In the context of power generation, the working cost of a generating plant to give the same increase in power is?

    <p>Equal to the working cost of generating plant to give the same increase in power</p> Signup and view all the answers

    For successful parallel operation of alternators, which of the following is a necessity?

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

    When two alternators are running in parallel, the synchronizing power developed will be maximum when?

    <p>The armature have less reactances than their resistances</p> Signup and view all the answers

    In parallel operation of alternators, the synchronizing power developed in one of the alternators will load the same alternator in which it is developed and reduce its speed. Is this statement true or false?

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

    When two alternators are running in parallel and the excitation of one alternator is more than the other, will the alternator having more excitation transfer the real power to the other alternator?

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

    A change in excitation of a machine changes terminal voltage for a single machine supplying a local load. Is this also true for infinite busbars?

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

    The actual division of total kW load between alternators running in parallel depends upon which characteristic?

    <p>A or B</p> Signup and view all the answers

    The division of total reactive KVA between alternators will depend upon which characteristic?

    <p>Voltage-load characteristic</p> Signup and view all the answers

    What is the critical value of surge impedance of large transmission line?

    <p>75 ohms</p> Signup and view all the answers

    What is the surge impedance of telephone line?

    <p>75 ohms</p> Signup and view all the answers

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