Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is_________________?

A. 200 °F
B. 200 °C
C. 200 °K
D. 200 °R

The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be___________________?

A. 27.6
B. 23
C. 47.3
D. 42.9

The hottest part of the flame lies in its _______________ zone?

A. Non-luminous
B. Luminous
C. Yellow
D. Unburnt gases

Highly caking coals_____________________?

A. Produce weak coke
B. Produce strong coke
C. May damage the coke oven walls during carbonisation
D. Both B. and C.

L.D. converter gas (produced in steel plant) comprises mainly of ___________________?

A. CO (upto 65%) & CO2
B. CO2 & H2
C. CO & O2
D. CO2 & O2

A gaseous fuel in order to develop luminosity on burning, must contain __________________?

A. Carbon monoxide
B. Hydrocarbons
C. Hydrogen
D. Oxygen

The cuprous chloride used in orsat apparatus can absorb___________________?

A. Only CO
B. Both CO and CO2
C. Both CO and O2
D. All CO, CO2, and O2

A good metallurgical coke___________________?

A. Should have high porosity
B. Should be brittle
C. Must contain moderate quantities of ash, moisture, sulphur and volatile matters
D. Should have low fusion point of its ash

_____________ has the widest inflammability limit (explosion limit) of all the gases?

A. Hydrogen
B. Carbon monoxide
C. Acetylene
D. Methane

“Micum Index” of a coke is a measure of its___________________?

A. Reactivity
B. Porosity
C. Bulk density
D. Hardness & strength