Compressors: Basic Concepts and Classification Quiz
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Questions and Answers

What is the purpose of a compressor?

  • To cool down gas to very low temperatures
  • To produce large pressure rise by compressing gas (correct)
  • To store gas in large quantities
  • To expand gas and reduce pressure

    • What is the usual pressure rise produced by a single stage compressor?

  • Up to 4 bar (correct)
  • Up to 1 bar
  • Between 1 to 2.5 bar
  • More than 10 bar

    • What are fans and blowers classified as in the context of compressors?

  • Variable pressure compressors
  • High pressure compressors
  • Low pressure compressors (correct)
  • Medium pressure compressors

    • How is the flow in a compressor stage described?

    <p>Decelerating flow as in a diffuser</p> Signup and view all the answers

    What are the everyday uses of compressors mentioned in the text?

    <p>Refrigeration, air conditioning, and industrial processes</p> Signup and view all the answers

    What type of compressors are positive displacement and reciprocating?

    <p>They are not classified by pressure</p> Signup and view all the answers

    What is the defining characteristic of a rotodynamic compressor?

    <p>Acceleration of flow</p> Signup and view all the answers

    In a multistage axial flow compressor, what is the defining characteristic of a high reaction stage?

    <p>Reverse flow near the blade tip</p> Signup and view all the answers

    What is the defining characteristic of stalling in compressors?

    <p>Complete breakdown of flow</p> Signup and view all the answers

    What is the distinguishing factor between surge and stall in compressors?

    <p>Complete breakdown of flow</p> Signup and view all the answers

    What is the major consequence of surge in a compressor?

    <p>Vibration of the entire machine</p> Signup and view all the answers

    In a rotodynamic compressor, what leads to pressure rises?

    <p>Acceleration of flow</p> Signup and view all the answers

    What is the primary impact of stalling on the stage efficiency of a compressor?

    <p>Higher losses due to reverse flow near the blade tip</p> Signup and view all the answers

    What characterizes a high reaction stage in an axial flow compressor?

    <p>Successive pressure drops and reduction in enthalpy</p> Signup and view all the answers

    What leads to surging in compressors?

    <p>Reducing the mass flow while maintaining constant rotational speed</p> Signup and view all the answers

    What characterizes multistage operation in compressors?

    <p>Pressure rises obtained through diffusing passages with a reduction in velocity</p> Signup and view all the answers

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