Category: Fuels and Combustion

A. Higher calorific value at constant volume
B. Gross calorific value at constant pressure
C. Lower calorific value at constant pressure
D. Net calorific value at constant volume

A. 30
B. 300
C. 3,000
D. 30,000

A. Is present upto 1-2%
B. Comes from protein in parent vegetable matter
C. Is recovered as ammonia during its carbonisation
D. All A., B. and C.

A. Cuprous chloride
B. Potassium hydroxide
C. Alkaline pyrogallol solution
D. None of these

A. Angle of repose of coal increases with its increasing size
B. Specific gravity of coal increases with its increasing maturity
C. Refractive index and reflectance of coal increases with the increasing rank of coal
D. Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H
ratio of coal

A. Sewage gas
B. LPG
C. Producer gas
D. Natural gas

A. Process of conversion of lignite into anthracite
B. Underground gasification of coal
C. Complete combustion of coal
D. Direct hydrogenation of coal

A. Lignite
B. Bituminous coal
C. Semi-anthracite
D. Anthracite

A. Less air for combustion
B. Correct amount of air for combustion
C. Too much air for combustion
D. Pulverised coal in boilers

A. Develops a non-luminous flame
B. Develops a low temperature flame
C. Can be done with less excess air
D. Provides a lower rate of heat release