Category: Fuels and Combustion

A. Reduction in coal size
B. Increase in its friability
C. Decrease in its caking capacity
D. All A., B. and C.

A. 1,800
B. 3,200
C. 5,400
D. 10,200

A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of
metals
B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn,
is called its flash point
C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas
D. Maximum yield of naphthalene is obtained on distillation of crude oil

A. Fermentation
B. Oxidation
C. Hydrogenation
D. None of these

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

A. Coke oven gas
B. Producer gas
C. Blast furnace gas
D. L.D. converter gas

A. Sulphur content
B. Calorific value
C. Both A. & B.
D. Neither A. nor B.

A. 8
B. 14
C. 22
D. 52

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