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

26. The highest thermal diffusivity is of





27. While designing the refrigeration system of an aircraft, the prime consideration is that the





28. The heat transfer takes place according to




29. An electrolux refrigerator is called a __________ absorption system.




30. The heat transfer by radiation __________ a medium.



31. Thermal conductivity of water __________ with rise in temperature.





32. During adiabatic saturation process on unsaturated air __________ remains constant.





33. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is





34. A perfect black body is one which





35. Degree of saturation or percentage humidity is





36. The coefficient of performance of Heat Pump is always __________ one.




37. During a refrigeration cycle, heat is rejected by the refrigerant in a





38. A refrigeration system





39. The subcooling in a refrigeration cycle





40. Which of the following is a non-ferrous metal?





41. During sensible cooling of air __________ decreases.





42. The critical radius is the insulation radius at which the resistance to heat flow is





43. In case of solids, the heat transfer takes place according to radiation.



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



45. The relative humidity decreases as air gets wet.



46. The temperature of ammonia after compression in a vapour compression system is





47. The centrifugal compressors are generally used for refrigerants that require





48. The water, alcohol and ammonia have same refrigerating effect at different altitudes.



49. The automobile radiator is a heat exchanger of





50. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.



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