ISRO 2019 Refrigeration and Air-Conditioning Questions, Answers and Explanation 1 . The highest value of thermal conductivity is expected for a) Solid ice b) Steam c) Water d) Superheated steam Answer c) Water Explanation As water is heated, much of the energy is used to bend the hydrogen bonds; a factor not available in the solid or gaseous phase. This extra energy causes the specific heat to be greater in liquid water. 4. Starting friction is low in which type of lubrication a) Hydrostatic lubrication b) Hydrodynamic lubrication c) Mixed (semi fluid) lubrication d) Boundary lubrication Answer a) Hydrostatic lubrication Explanation In hydrodynamic lubrication the outer surface of journal and inner surface of bearing always remain in contact. In hydrostatic lubrication when the bearing starts to move, the pump supplies oil at a pressure thereby creating a clearance between the journal and the bearing. This reduces the starting friction. 8. A circular...