Chemical Engineering – Page 272

2711. Which adsorbant is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ?

Silica gel

Diatomaceous earth

Basalt

Bog iron (i.e., moist ferric hydroxide)

✅ The correct answer is option D.

2712. Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

%of CO₂ in

% of O₂in

Temperature of

Colour of

✅ 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.

2714. 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.

2715. 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.

2716. 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.

2717. Naphtha yield in straight run distillation of crude oil may be about __________ percent.

✅ 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.

2719. Which of the following has the lowest cetane number ?

Aromatics

i-paraffins

Naphthene

Olefins

✅ The correct answer is option A.

2720. 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.