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Fuels and Combustion

Fuels and Combustion
For long flame and easy ignition, the coal used should have

High volatile matter
High calorific value
High ash
Low ash

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Fuels and Combustion
Actual flame temperature is always lower than the adiabatic flame temperature, because there is

Both A & B
Neither A nor B
No possibility of obtaining complete combustion at high temperature
Always loss of heat from the flame

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Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Difference in gross & net calorific value
Sulphur content
Higher C/H ratio
Calorific value

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Fuels and Combustion
Which of the following accounts for maximum energy loss in a boiler?

Unburnt carbon in flue gases
Incomplete combustion
Flue gases
Ash content in the fuel

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Fuels and Combustion
A travelling grate stoker is meant for the efficient burning of __________ coal.

Non-caking
Caking
High ash
Pulverised

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Fuels and Combustion
Volumetric ratio of Nā‚‚ to Oā‚‚ in dry atmospheric air is

4.76
0.79
0.21
3.76

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