Power Plant Operations and Maintenance
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Questions and Answers

What is the typical voltage range of distribution feeders?

  • 66-132 kV
  • 33-66 kV
  • 0.3-3.3 kV
  • 3.3-33 kV (correct)

    • What is the primary function of transformers in the power system?

  • To change the voltage and current levels of the power flow (correct)
  • To provide safety through switching and protection
  • To transmit power from one location to another
  • To regulate voltage within an acceptable range

    • What is the advantage of interconnection in terms of spare capacity?

  • It enables the sharing of spare capacity, resulting in reduced costs (correct)
  • It is only necessary for steam-driven plants
  • It allows for the operation of smaller generating stations
  • It increases the overall capital and operating costs

    • What is the main factor that determines the capacity of power lines?

    <p>The current-carrying capacity of the conductor</p> Signup and view all the answers

    What is the primary reason for having excess capacity in a power generation system?

    <p>To provide power in the event of a generator breakdown or maintenance outage</p> Signup and view all the answers

    What is the merit order listing used for in power generation?

    <p>To determine the order in which generating stations are operated to achieve the cheapest electricity</p> Signup and view all the answers

    Why is it necessary for spare generating capacity to operate as spinning reserve in steam-driven plants?

    <p>Because steam-driven plants cannot start up from cold quickly in an emergency</p> Signup and view all the answers

    What is the relationship between the net installed capacity of each level and the distance from the consumer?

    <p>It increases as one moves towards the consumer</p> Signup and view all the answers

    What is the optimal operating condition for generating plant to achieve cheaper electricity?

    <p>Operating large stations under optimum conditions and in the optimum configuration</p> Signup and view all the answers

    What is the total capacity range of distribution feeders?

    <p>2-35 MW</p> Signup and view all the answers

    What is the main disadvantage of thermal generating stations?

    <p>They are subject to the laws of thermodynamics, which limit their efficiency</p> Signup and view all the answers

    What happens to voltage drop and power losses in power lines as the load increases?

    <p>They increase in direct proportion to the load</p> Signup and view all the answers

    What is the main purpose of a transmission system in an electric power system?

    <p>To transport large amounts of power over long distances</p> Signup and view all the answers

    What is the primary concern in power generation?

    <p>Achieving the lowest possible energy cost</p> Signup and view all the answers

    What is the main component of an electric power system that delivers electrical energy from a transmission substation to customers?

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

    What is the typical voltage range for transmission lines in European countries?

    <p>300, 400, 500, and 750 kV</p> Signup and view all the answers

    What is the function of a sub-transmission system?

    <p>To reduce the voltage for distribution</p> Signup and view all the answers

    What is one of the main environmental issues associated with power generation?

    <p>All of the above</p> Signup and view all the answers

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