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Fuels and Combustion

Fuels and Combustion
Which of the following is used for making the explosive 'TNT'?

Toluene
Pyridine
Benzol
Cerosote

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Fuels and Combustion
Pulverised coal used in boiler firing need not have

High bulk density
High fusion point of its ash
Lower ash content
Less moisture content

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Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Lower carbon dioxide content
Higher methane content and thus higher calorific value
None of these
Higher carbon monoxide content

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Fuels and Combustion
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces

Lower amount of hydrogen
Higher amount of both methane and hydrogen
Both A & B
Higher amount of methane

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Fuels and Combustion
Gray-King Assay and Roga Index of coal is a measure of its

Weathering properties
Abradability
Grindability
Caking and swelling properties

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

Coke oven gas
Sewage gas
Natural gas
Blast furnace gas

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