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Home Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning Comments

  • Question
  • For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of


  • Options
  • A. copper
  • B. aluminium
  • C. steel
  • D. brass

  • Correct Answer
  • steel 


  • Heat Transfer, Refrigeration and Air Conditioning problems


    Search Results


    • 1. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.

    • Options
    • A. higher
    • B. lower
    • Discuss
    • 2. Defrosting of a refrigerator may be done by stopping the compressor for a short period.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 3. The optimum effective temperature for human comfort is

    • Options
    • A. higher in winter than in summer
    • B. lower in winter than in summer
    • C. same in winter and summer
    • D. not dependent on season
    • Discuss
    • 4. The sensible heat factor during cooling and dehumidification process is given by (where h1 = Enthalpy of air entering the cooling coil, h2 = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 5. The formation of frost on cooling coils in a refrigerator

    • Options
    • A. increases heat transfer
    • B. improves C.O.P. of the system
    • C. increases power consumption
    • D. reduces power consumption
    • Discuss
    • 6. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

    • Options
    • A. 0.3
    • B. 0.6
    • C. 0.67
    • D. 1.5
    • Discuss
    • 7. The heat transfer by conduction through a thick sphere is same as through a thick cylinder.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

    • Options
    • A. same as
    • B. lower than
    • C. higher man
    • Discuss
    • 9. Which of the following statement is wrong?

    • Options
    • A. The heat transfer in liquid and gases takes place according to convection.
    • B. The amount of heat flow through a body is dependent upon the material of the body.
    • C. The thermal conductivity of solid metals increases with rise in temperature,
    • D. Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.
    • Discuss
    • 10. During adiabatic saturation process on unsaturated air __________ remains constant.

    • Options
    • A. relative humidity
    • B. dew point temperature
    • C. dry bulb temperature
    • D. wet bulb temperature
    • Discuss


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