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Fuels and Combustion

Fuels and Combustion
Oxygen percentage (by weight) in atmospheric air is

21
29
19
23

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Fuels and Combustion
Very __________ coals are completely devoid of cokability i.e, it is non coking.

Neither A nor B
Mature
Both A & B
Young

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

70
85
100
50

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Fuels and Combustion
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

None of these
Banking
Under pressurising
Back draughting

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Fuels and Combustion
Coals used for the generation of producer gas should have

Low fusion point of ash
Very low ash content (8-10%)
High volatile matter content
High caking index

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Fuels and Combustion
The difference between total carbon and fixed carbon of coal will be minimum in case of

Anthracite
High temperature coke (V.M < 0.5%)
Lignite
Bituminous coal

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