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Fuels and Combustion

Fuels and Combustion
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

50
85
100
70

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Fuels and Combustion
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

55 to 75
15 to 25
75
35 to 45

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Fuels and Combustion
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

400-500
1700-1800
1400-1500
900-1000

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Fuels and Combustion
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is

200 °K
200 °F
200 °C
200 °R

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Fuels and Combustion
Coke ovens in steel plant are heated by

Both B & C
Electricity
Coke oven gas
Mixed gas

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Fuels and Combustion
Fuel combustion is never cent per cent efficient due to

All of these
Incomplete combustion
Dry gas/stack gas loss
Moisture loss

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