4. Determine the enthalpy (h) for water at (a) 200 ℃ with a specific volume of 0.9 m^3⁄kg.

(b) 100 ℃ at a pressure of 0.7 bar.

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives