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Fuels and Combustion

Fuels and Combustion
Coking coals are invariably

Semi-anthracites
Lignites
Anthracites
Bituminous coals

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Fuels and Combustion
Mineral matter content (M) and ash content (A) in coal are approximately related as

M = A
M = 1.1A
M = 2A
M = 1.5A

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Fuels and Combustion
Which will have the least volatile matter and hence will be the most difficult to ignite?

Semi-bituminous coal
Aanthracite
Bituminous coal
Coke

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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
Which of the following has the least calorific value (kcal/Nm³) ?

Blast furnace gas
Coke oven gas
Sewage gas
Natural gas

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Fuels and Combustion
Artificial draught produced by a fan can be controlled by the

Speed of the fan
Damper
Variation in the pitch of the fan blades
All of these

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