10009 4 1॥1॥॥॥॥1॥1

25.

27.

a) Differentiate between vegetable oil and mineral oil lubricants.

b) Write the working of a Bomb calorimeter for determining the calorific value
of a solid fuel with the help of a neat diagram. (3+7)

OR

. a) What are lubricants ? How are they classified on the basis of their physical

state ? What are their important functions ?
b) Write any four desirable properties of a lubricant and indicate the significance
of the properties. (5+5)
a) Whatis the main purpose of secondary sewage water treatment ? Explain
trickling filter process.
b) What is desalination ? How is it performed by reverse process ? (5+5)
OR

. a) How is UASB process useful in waste water treatment ?

b) What are the factors which governs the amount of dissolved oxygen
in water ? (5+5)