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Fuels and Combustion

Fuels and Combustion
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.

90-110
>120

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Fuels and Combustion
Narrow coke ovens as compared to wider coke ovens

Produce smaller coke
Require less time of carbonisation
All of these
Produce stronger coke

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Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

77
21
29
79

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Fuels and Combustion
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

Shallow and small piles
Large heaps with small surface to volume ratio
Closed space without any ventilation facility
Fine sizes without the presence of any lump

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Fuels and Combustion
Which of the following accounts for maximum energy loss in a boiler?

Unburnt carbon in flue gases
Flue gases
Ash content in the fuel
Incomplete combustion

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Fuels and Combustion
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

0.1
5
10
2

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