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

  • The ratio of surface convection resistance to the internal conduction resistance is known as


  • Options
  • A. Grashoff number
  • B. Biot number
  • C. Stanton number
  • D. Prandtl number

  • Correct Answer
  • Biot number 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The critical thickness of insulation for a sphere is

    • Options
    • A. k/h0
    • B. 2k/h0
    • C. h0/k
    • D. h0/2k
      • Discuss
    • 2. In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

    • Options
    • A. reversed Carnot cycle
    • B. reversed Joule cycle
    • C. reversed Brayton cycle
    • D. reversed Otto cycle
      • Discuss
    • 3. Moisture should be removed from refrigerants to avoid

    • Options
    • A. freezing at the expansion valve
    • B. restriction to refrigerant flow
    • C. corrosion of steel plates
    • D. all of these
      • Discuss
    • 4. In mechanical refrigeration system, the refrigerant has the maximum temperature

    • Options
    • A. in evaporator
    • B. before expansion valve
    • C. between compressor and condenser
    • D. between condenser and evaporator
      • Discuss
    • 5. In a reversed Brayton cycle, the heat is absorbed by the air during

    • Options
    • A. isentropic compression process
    • B. constant pressure cooling process
    • C. isentropic expansion process
    • D. constant pressure expansion process
      • Discuss
    • 6. Wet bulb temperature is the temperature of air recorded by a thermometer, when

    • Options
    • A. it is not effected by the moisture present in the air
    • B. its bulb is surrounded by a wet cloth exposed to the air
    • C. the moisture present in it begins to condense
    • D. none of the above
      • Discuss
    • 7. When there is an addition of water vapour to the air of enclosed space, a gain in __________ is said to occur.

    • Options
    • A. sensible heat
    • B. latent heat
      • Discuss
    • 8. The temperature below which a gas is always liquified, is known as critical temperature.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 9. The expression is used for calculating

    • Options
    • A. relative humidity
    • B. humidity ratio
    • C. degree of saturation
    • D. pressure of water vapour
      • Discuss
    • 10. In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

    • Options
    • A. condenser
    • B. evaporator
    • C. absorber
    • D. none of these
      • Discuss

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