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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
  • Question

  • In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.


  • Options
  • A. same
  • B. less
  • C. greater

  • Correct Answer
  • greater 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Pressure of water vapour is given by

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 2. The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Upto the critical radius of insulation,

    • Options
    • A. added insulation will increase heat loss
    • B. added insulation will decrease heat loss
    • C. convective heat loss will be less than conductive heat loss
    • D. heat flux will decrease
      • Discuss
    • 4. The rato of energy transferred by convection to that by conduction is called

    • Options
    • A. Stanton number
    • B. Nusselt number
    • C. Biot number
    • D. Peclet number
      • Discuss
    • 5. The heat transfer by conduction through a thick cylinder(Q) is given by (where T1 = Higher temperature, T2 = Lower temperature, r1 = Inside radius, r2 = Outside radius, l = Length of cylinder, and k = Thermal conductivity)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.

    • Options
    • A. increases
    • B. decreases
      • Discuss
    • 7. The drier in a refrigeration system removes moisture in the system.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 8. Wet bulb temperature indicates the moisture content in air.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 9. A vapour absorption refrigeration system

    • Options
    • A. gives noisy operation
    • B. gives quiet operation
    • C. requires little power consumption
    • D. cools below 0° C
      • Discuss
    • 10. The relative humidity lines on a psychrometric chart are

    • Options
    • A. vertical and uniformly spaced
    • B. horizontal and uniformly spaced
    • C. horizontal and non-uniformly spaced
    • D. curved lines
      • Discuss

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