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3163. Low temperature carbonisation

Is mainly for producing the smokeless domestic coke

Is meant for the production of ‘metallurgical coke’

Produces higher quantity of gas than high temperature carbonisation

Produces less quantity of tar than high temperature carbonisation

✅ The correct answer is option A.

3168. Fussain

Is friable, charcoal like substance

Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal

Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

All of the above

✅ The correct answer is option D.

3173. With increase in C/H ratio of a fuel, the dew point of flue gases

Increases

Decreases

Remains same

May increase or decrease ; depends on the type of fuel

✅ The correct answer is option B.

3178. Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in

Air

Oxygen

Either A or B

Either A or C without gain or loss of heat

✅ The correct answer is option D.

3144. Which will have the least volatile matter and hence will be the most difficult to ignite?

Bituminous coal

Coke

Semi-bituminous coal

Aanthracite

✅ The correct answer is option B.

3150. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

Ammonium sulphate

Ammonium nitrate

Ammonium phosphate

None of these

✅ The correct answer is option A.

3154. Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Coke oven gas

Water gas

Natural gas

Blast furnace gas

✅ The correct answer is option D.

3159. Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Multicyclones

Bag filter

Wet scrubber

Hydrocyclones

✅ The correct answer is option B.

3164. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

105

145

✅ The correct answer is option C.

3169. A coal that softens and fuses on heating is

Classified

Carbonised

Caking

Non-caking

✅ The correct answer is option C.

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