24.

25,

28.

(0) What is silicone rubber? List two important propertiesof silicone rubber. (4+3+3)
OR

(a) What are carbon nanotubes?

(b) Write the characteristic properties of carbon nano tubes.

(c) What are fullerenes? List two applications of fullerenes. (44+3+3)

(a) 0.72g of a fuel containing 80% C, when burnt in a bomb calorimeter increased the

temperature of water from 27.3 to 29.1°C. If the calorimeter contains 250g of water and its

water equivalent is 150g, calculate the HCV of the fuel.

(b) Write a method of preparation of biodiese! .What are its merits and demerits?

(0) Distinguish between flash and fire points, write the significance of the terms in the

selection of a lubricant. (3+3+4)

OR

26. (a) What do you mean by a lubricant? Write its functions.

(b)Calculate gross and net calorific value of a fuel having following composition82% C, 8% H,
5% 0, 2.5% S, 1.4%N and 2.1% ash.
(c) What is knocking? Mention disadvantages of knocking. (3+4+3)

.(a)How 15 reverse osmosis process applied in the desalination of brackish water? Mention

the advantages of the process.

(0) What 15 the principle of EDTA method? 0.30 ഉ of CaCO 3 was dissolved in HCI and the

solution was made to one litre with distilled water. 100 mL of the above solution required 30

ml of EDTA solution. 100 mL of hard water required 33mL of the EDTA solution on titration.

After boiling 100 mL of this water required 10 mL of EDTA solution. Calculate temporary and

permanent hardness of water. (5+5)
OR

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

(b)What are the factors which govern the amount of dissolved oxygen in water?

(c) A sample of water 15 found to contain 16.2mg/L calcium bicarbonate, 7.3mg/L magnesium

bicarbonate, 9.5mg/L magnesium chloride, and 13.6mg/L calcium sulphate. Calculate

temporary and permanent hardness? What happen to the temporary and permanent hardness of

the water sample if 10.6mg/L 1422603 15 added? (41313)