Fuels and Combustion
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

Propane and acetylene
Propane and LPG
F. gas and coke oven gas
Sewage gas and gobar gas

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Fuels and Combustion
Pick out the wrong statement.

Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
None of these

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