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Fuels and Combustion

Fuels and Combustion
A sooty flame can be made non-luminous by

Admitting more gas
Admitting more air
Shutting gas supply
Shutting air supply

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Fuels and Combustion
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

3 & 10
10 & 3
15 & 8
10 & 20

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Fuels and Combustion
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Pitch
Blast furnace gas
Fuel oil
Bituminous coal

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Fuels and Combustion
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

10
75
25
50

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Fuels and Combustion
By-products are __________ recovered in 'Beehive ovens'.

Partially
Fully
Not at all
Negligibly

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

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

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