Compressor Control Methods Quiz
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Questions and Answers

What method is used to control the compressor output by shutting down the compressor when little or no air is required by the system?

  • Dual control
  • Start and stop control (correct)
  • Variable speed control
  • Load/unload control
  • Which type of compressor units can utilize the start and stop control method as described in the text?

  • Electric motor driven units (correct)
  • Gasoline motor driven units
  • Diesel motor driven units
  • Steam turbine driven units
  • What should be done to prevent the compressor from continuously starting and stopping according to the text?

  • Increase the pressure setting on the pressure switch
  • Use a smaller receiver to reduce costs
  • Use a variable speed control
  • Install a sufficiently large receiver (correct)
  • How does the unloader protect the motor from overloading during the startup period?

    <p>By automatically unloading the compressor during startup</p> Signup and view all the answers

    What happens to the unloader valve when the compressor reaches operating speed?

    <p>Automatically closes</p> Signup and view all the answers

    What is the main function of the centrifugal type loader shown in Figure 12?

    <p>To unload the compressor when it stops</p> Signup and view all the answers

    What is the purpose of the unloader valve in a reciprocating compressor system?

    <p>To reduce the pressure in the compressor discharge pipe to atmospheric pressure</p> Signup and view all the answers

    In a load/unload control system, what does the pilot type unloader do?

    <p>Varies the output from the compressor according to air demand</p> Signup and view all the answers

    How does the inlet valve unloader operate in a load/unload control system?

    <p>Closes the inlet valves completely</p> Signup and view all the answers

    What method is used to adjust the compressor speed according to system demand?

    <p>Variable Speed Control</p> Signup and view all the answers

    When does the pressure-actuated control slow down the driving engine or turbine in a variable speed control system?

    <p>When system demand for air increases</p> Signup and view all the answers

    What happens in dual capacity control when a compressor runs a set time without loading?

    <p>It shuts down</p> Signup and view all the answers

    What is one function of protective controls in a compressor system?

    <p>To protect the compressor from damage or catastrophic failure</p> Signup and view all the answers

    How does an inlet valve unloader operate in a reciprocating compressor system?

    <p>By making the inlet valve completely ineffective when unloaded</p> Signup and view all the answers

    In what situation does dual control shut down a compressor in a reciprocating system?

    <p>When it runs without any loading.</p> Signup and view all the answers

    What does an inlet valve unloader do when operating due to decreased air pressure in a reciprocating compressor system?

    <p>It retracts and allows inlet valve plates to seat again.</p> Signup and view all the answers

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