mechanical-engineering-heat-transfer-refrigeration-and-air-conditioning Related Question Answers

76. Bell-Coleman cycle is a





77. Sulphur dioxide is extremely toxic and non-flammable.



78. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.



79. 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


80. Which tax is levied and collected by the Union but wholly assigned to the states?





81. Which of the following statement is correct for ammonia as a refrigerant?





82. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.




83. The use of heat exchangers is made in





84. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in





85. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.



86. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.



87. During cooling and dehumidification, dry bulb temperature




88. The coefficient of performance of electrolux refrigerator is the ratio of





89. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.



90. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.



91. The conditioned air supplied to the room must have the capacity to take up





92. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.



93. The specific humidity during dehumidification process




94. Which of the following refrigerant has the lowest freezing point?





95. For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.



96. Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?





97. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.



98. In electrolux refrigerator





99. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be





100. A boot-strap air cooling system has





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