95) 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

96) A boot-strap air cooling system has

97) The boiling point of __________ is -10.5 Degree Centigrade.

98) One tonne of refrigeration (1TR) means that the heat removing capacity is

99) The operating pressure for refrigerating units using R-12 as a refrigerant is