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Fuels and Combustion

Fuels and Combustion
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

50
0.5
10
500

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Fuels and Combustion
Which of the following has the highest flame velocity?

H₂
CH₄
C₂H₆
CO

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Fuels and Combustion
Benzene is used

As a motor fuel
As an explosive
For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)
As a perfume

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Fuels and Combustion
Washing of coal is done to reduce the

Mineral matter
Both B and C
Adhering impurities
Inherent impurities

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Fuels and Combustion
High excess air in combustion of fuels results in

Incomplete combustion
Increased fuel consumption
None of these
Smoky flame

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Fuels and Combustion
Which of the following fuel gases has the highest calorific value ?

Sewage gas
Coal bed methane (CBM)
Natural gas
Liquefied petroleum gas (LPG)

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