%of CO₂ in
% of O₂in
Temperature of
Colour of
✅ The correct answer is option B.
Engineering
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2712. 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. With increase in the temperature of carbonisation of coal
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Methane content in the coke oven gas decreases and carbon monoxide content increases
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
All of the above
✅ The correct answer is option D.
2714. Hydrofining is the most recent and effective method for the
removal of sulphur.
improvement of smoke point.
reduction of breathing loss.
improvement of viscosity index.
✅ The correct answer is option A.
2715. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.
decreases
increases
remains unchanged
decreases linearly
✅ The correct answer is option B.
2716. Naphtha yield in straight run distillation of crude oil may be about __________ percent.
2
6
12
18
✅ The correct answer is option B.
2717. The first crude oil refinery of India is located at
Naharkatiya
Digboi
Kochin
Madras
✅ The correct answer is option B.
2718. Which of the following has the lowest cetane number ?
Aromatics
i-paraffins
Naphthene
Olefins
✅ The correct answer is option A.
2719. With increase in calorific value of fuels, their adiabatic flame temperatures
Increase
Decrease
Remain unchanged
May increase or decrease ; depends on the quantity of products of combustion
✅ The correct answer is option D.
2720. Bulk density of pulverised coal may be about __________ kg/m³.
100
500
1000
1500
✅ The correct answer is option B.