Gas Turbine Characteristics
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Questions and Answers

What makes gas turbines ideal for standby duties such as fire pumps and emergency electricity generators?

  • They require slow and elaborate preparations before starting
  • They have lower NOX emissions than steam turbines
  • They have lower mechanical/thermal efficiency
  • They can be started almost instantaneously (correct)

    • What is a major drawback of gas turbines in terms of the types of fuel they can use?

  • They can only use solid fuels
  • They have high noise levels
  • They are limited to clean, liquid, or gaseous fuels (correct)
  • They require special baffle systems for exhaust

    • Why do gas turbines have low mechanical/thermal efficiency compared to other power plants?

  • Because they have high NOX emissions
  • Because they have higher compression ratio
  • Because they are affected by ambient air pressure and temperature (correct)
  • Because they require special baffle systems for exhaust

    • How do gas turbines differ from steam turbines in terms of startup and loading?

    <p>Gas turbines can be started almost instantaneously, while steam turbines require slow and elaborate preparations</p> Signup and view all the answers

    Which technological advance has increased gas turbine thermal efficiency according to the text?

    <p>More efficient compressor blades</p> Signup and view all the answers

    What environmental concern is associated with gas turbines according to the text?

    <p>High NOX emissions</p> Signup and view all the answers

    Why are regenerators added to gas turbines?

    <p>To improve thermal efficiency</p> Signup and view all the answers

    What makes gas turbines ideal for supplying the mechanical drive for electrical generators operated only to supply peak electrical loads?

    <p>Rapid loading up to full load</p> Signup and view all the answers

    What is one advantage of gas turbines compared to steam plants?

    <p>Higher power to weight ratio</p> Signup and view all the answers

    Why do gas turbine plants have lower installed cost compared to steam plants?

    <p>They require less space</p> Signup and view all the answers

    What contributes to the lower maintenance and operating cost of gas turbines?

    <p>Simplicity and fewer auxiliaries</p> Signup and view all the answers

    Why can gas turbines operate economically with a closed circulating water system?

    <p>They have air-cooled heat exchangers</p> Signup and view all the answers

    What characteristic distinguishes gas turbines from other types of prime movers?

    <p>High power to weight ratio</p> Signup and view all the answers

    Why are gas turbine plants less mechanically complex than steam plants?

    <p>They have fewer moving parts</p> Signup and view all the answers

    What contributes to the rapid startup and loading of gas turbines?

    <p>Absence of reciprocating motion</p> Signup and view all the answers

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