Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 45 of 47)

Anthracite coal ____________________?
A. Contains more volatile matter than bituminous coal
B. Ignites more easily than bituminous coal
C. Is essentially a coking coal
D. Burns with short, bluish, yellow-tipped flame producing very little smoke
Stack heat losses can be minimised by________________?
A. Controlling the excess air
B. Oxygen enrichment of combustion air
C. Using low c.v. fuels
D. Maintaining proper draft in the furnace
Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its calorific value tremendously
C. It reduces its flame temperature tremendously
D. There are chances of explosion during preheating
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?
A. 8800 kcal/m3
B. 8800 kcal/kg
C. Same as that of coal middling
D. 25000 kcal/kg