Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 35 of 47)

Fuel combustion is never cent per cent efficient due to___________________?
A. Incomplete combustion
B. Dry gas/stack gas loss
C. Mositure loss
D. All a., b. and c.
Insitu theory and drift theory are related to the____________________?
A. Origin of petroleum oil
B. Origin of coal
C. Coalification
D. Variation of coal quality with depth
Washing of coal________________?
A. Reduces its sulphur and ash content
B. Controls its ash fusibility and increases its calorific value
C. Improves its coking properties
D. All a., b. and c.
A good metallurgical coke should have very low__________________?
A. Sulphur & phosphorous content
B. Porosity
C. Fusion point of its ash
D. Hardness & strength
Ignition temperature decreases progressively from anthracite to lignite, because___________________?
A. Volatile matter content increases
B. Carbon content decreases
C. Mositure content increases
D. Ash content increases
(64-132) rank coal (ASTM) means a coal with 64%___________________?
A. Fixed carbon and having a heat value of 13, 200 btu/1b
B. Ash and a heating value of 13, 200 btu/1b
C. Fixed carbon and a heating value of 132 btu/1b
D. None of these
The most matured coal out of the following is__________________?
A. Lignite
B. Semi-anthracite
C. Sub-bituminous
D. Bituminous