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Fuels and Combustion

Fuels and Combustion
Dry air required to burn 1 kg of carbon completely may be around __________ kg.

38
2
20
11

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Fuels and Combustion
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Excessive fly-ash discharge from the stack
Erosion of induced draft fan blades
High power consumption in its transportation
Ash disposal problem

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Fuels and Combustion
Insitu theory and drift theory are related to the

Origin of petroleum oil
Origin of coal
Variation of coal quality with depth
Coalification

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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
Young
Both A & B

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Fuels and Combustion
Gross heating value of coal is __________ the net heating value.

Lower than
Higher than
None of these
Same as

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Fuels and Combustion
Coke oven gas constitutes mainly of

CH₄ & CO
H₂ & CO₂
H₂ & CH₄
H₂ & CO

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