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Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines See What Others Are Saying!
  • Question

  • The process, which causes the air to enter the impeller blades of a centrifugal compressor at __________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.


  • Options
  • A. reduced
  • B. increased

  • Correct Answer
  • reduced 

    • More questions

    • 1. The amount by which the outer edge of the rail is raised, is known as super-elevation.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 2. Process layout is also known as

    • Options
    • A. analyticallayout
    • B. synthetic layout
    • C. static product layout
    • D. none of these
      • Discuss
    • 3. There is no change in internal energy in an isothermal process.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. Combustuion of fuel takes place __________ the engine cylinder of a steam engine.

    • Options
    • A. outside
    • B. inside
      • Discuss
    • 5. The neutral axis of the cross-section a beam is that axis at which the bending stress is

    • Options
    • A. zero
    • B. minimum
    • C. maximum
    • D. infinity
      • Discuss
    • 6. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is

    • Options
    • A. ammonia
    • B. carbon dioxide
    • C. sulphur dioxide
    • D. R-12
      • Discuss
    • 7. A centrifugal compressor is an axial flow compressor.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 8. Second law of thermodynamics defines

    • Options
    • A. heat
    • B. work
    • C. internal energy
    • D. entropy
      • Discuss
    • 9. An open structure of a grinding wheel is denoted by the number 1 to 8.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 10. The ratio of total useful heat drop to the total isentropic heat drop, is called

    • Options
    • A. stage efficiency
    • B. internal efficiency
    • C. Rankine efficiency
    • D. none of these
      • Discuss

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