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2708. Higher efficiency in the combustion of solid fuel can not be achieved by

Proper fuel preparation

Keeping the flue gas exhaust temperature very high

Adopting efficient-fuel firing technique & equipment

Supplying correct quantity of combustion air

✅ The correct answer is option B.

2713. The first crude oil refinery of India is located at

Naharkatiya

Digboi

Kochin

Madras

✅ The correct answer is option B.

2718. Most widely used solvent for dewaxing is

methyl-ethyl-ketone (MEK)

naphtha

petroleum ether

sodium plumbite

✅ The correct answer is option A.

2649. Octane number of 2, 2, 4 – trimethyl pen-tane is

0

100

In between 0 and 100

More than 100

✅ The correct answer is option B.

2654. In petroleum refining, the process used for conversion of hydrocarbons to aromatics is

catalytic cracking

catalytic reforming

hydrotreating

alkylation

✅ The correct answer is option B.

2663. Gum formation in stored gasoline is mainly due to the

alkylation of unsaturates.

presence of sulphur.

oxidation & polymerisation of unsaturates.

higher aromatic content.

✅ The correct answer is option C.

2603. Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

Smoke

Temperature

Oxygen

Carbon monoxide

✅ The correct answer is option D.

2608. Presence of sulphur in gasoline

leads to corrosion.

increases lead susceptibility.

decreases gum formation.

helps during stabilisation.

✅ The correct answer is option A.

2613. Which of the following gaseous fuels has the lowest calorific value?

Gobar gas

Refinery gas

Converter gas

Blast furnace gas

✅ The correct answer is option D.

2618. Diesel used in naval applications has a minimum cetane number of

25

35

45

65

✅ The correct answer is option C.