Category: Fuels and Combustion

A. Ash
B. Inherent mineral matter
C. Free impurities
D. Volatile matter

A. Decreases with increase in surface area
B. Does not vary with increase in surface area
C. Is more for low volatile coal compared to high volatile coal
D. Is accelerated by storage in large heaps with small surface to volume ratio

A. Density of the chimney gases
B. Height of the chimney
C. Both A. and B.
D. Neither A. nor B.

A. Producer gas
B. Coal gas from underground gasification of coal
C. Refinery gases
D. None of these

A. Proximate analysis
B. Ultimate analysis
C. Caking index
D. Calorific value

A. Scrubbing with wash oil (a petroleum product)
B. Adsorbing on bog iron bed
C. Absorbing in vetro-coke solution
D. None of these

A. 80 and 97
B. 95 and 100
C. 40 and 70
D. 25 and 97

A. Main constituents of LPG are propane and butane
B. C.V. of natural gas is about 10000 KCal/Nm3
C. C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)
D. L.P.G. is lighter than air

A. Ignites less easily than anthracite
B. Is generally coking
C. Burns with smoky yellow flame
D. Both B. and C.

A. Permits the use of high ash content coal
B. Permits the use of low fusion point ash coal
C. Accelerates the burning rate and economises on fuel combustion
D. All A., B. and C.