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  • Question

  • The multi-stage compression ofair as compared to single stage compression


  • Options
  • A. improves volumetric efficiency for the given pressure ratio
  • B. reduces workdone per kg of air
  • C. gives more uniform torque
  • D. all of these

  • Correct Answer
  • all of these 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

    • Options
    • A. Backward curved blades has poor efficiency
    • B. Backward curved blades lead to stable performance
    • C. Forward curved blades has higher efficiency
    • D. Forward curved blades produce lower pressure ratio
      • Discuss
    • 2. In a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling.

    • Options
    • A. less than
    • B. more than
      • Discuss
    • 3. The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2 = Workdone due to back flow)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. For perfect intercooling in a two stage compressor,

    • Options
    • A.
    • B.
    • C. p1 = p3
    • D. p1 = p2 p3
      • Discuss
    • 5. The workdone on a compressor will be minimum if air is taken from

    • Options
    • A. the atmosphere
    • B. a source at 0° C
    • C. a source of low temperature air
    • D. a source of high temperature air
      • Discuss
    • 6. The centrifugal compressors are generally used for refrigerants that require

    • Options
    • A. small displacements and low condensing pressures
    • B. large displacements and high condensing pressures
    • C. small displacements and high condensing pressures
    • D. large displacements and low condensing pressures
      • Discuss
    • 7. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

    • Options
    • A.
    • B.
    • C. AU Cmin
    • D.
      • Discuss
    • 8. Which of the following statement is correct for ammonia as a refrigerant?

    • Options
    • A. It is toxic to mucous membranes.
    • B. it requires large displacement per TR compared to fluoro carbons.
    • C. It reacts with copper and its alloys.
    • D. all of these
      • Discuss
    • 9. During humidification process, __________ increases.

    • Options
    • A. wet bulb temperature
    • B. relative humidity
    • C. dry bulb temperature
    • D. specific humidity
      • Discuss
    • 10. Conduction is a process of heat transfer

    • Options
    • A. from one particle of the body to another without the actual motion of the particles
    • B. from one particle of the body to another by the actual motion of the heated particles.
    • C. from a hot body to a cold body, in a straight line, without affecting the intervening medium
    • D. none of the above
      • Discuss

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