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Fuels and Combustion

Fuels and Combustion
Catalyst used in Fischer-Tropsch process is

Nickel
Thorium oxide
Zinc oxide
Alumina

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Fuels and Combustion
The heat of combustion of a fuel

Is always positive
Is always negative
Can't be known without calculating it
Is equal to the heat of formation

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

Natural gas
Gobar gas
LPG
Carburetted water gas

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Fuels and Combustion
'Fuel' can be defined as a substance which produces heat by

Nuclear fission
Combustion
Nuclear fusion
All of these

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Fuels and Combustion
The hottest part of the flame lies in its____zone.

Yellow
Unburnt gases
Non-luminous
Luminous

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Fuels and Combustion
Washing of coal is done to reduce the

Adhering impurities
Mineral matter
Both B and C
Inherent impurities

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