Category: Fuels and Combustion

A. 19
B. 21
C. 23
D. 29

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

A. Controlling the excess air
B. Oxygen enrichment of combustion air
C. Using low c.v. fuels
D. Maintaining proper draft in the furnace

A. 200 meters
B. Infinitely long
C. More than 105.7 metres
D. Equal to the height of the hot gas column producing draught

A. High concentration of oxygen in flue gas means high stack loss
B. Gaseous fuels require the least % excess air for complete combustion
C. The ratio of fixed carbon to volatile matter percentage in coal is called its ‘fuel ratio’
D. Calorific value of natural gas is more than that of LPG

A. 12 hours
B. 2-3 days
C. One week
D. Two weeks

A. Winkler process
B. Kopper-Totzek process
C. Lurgi Process
D. None of these

A. CO
B. CO2
C. H2O
D. Both B. & C.

A. CO & H2
B. CO & N2
C. CO2 & H2
D. CH4 & H2

A. Sulphur & phosphorous content
B. Porosity
C. Fusion point of its ash
D. Hardness & strength