2691. Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.
2
4
6
1
✅ The correct answer is option A.
Chemical Engineering
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2692. __________ is not an important refinery process for upgrading the quality of lubricating oil.
Deoiling
Solvent refinning
Clay treatment
Hydrotreatment
✅ The correct answer is option A.
2693. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Transportation of coal
Drying of coal
Combustion of coal by supplying it around the burner
Preheating the primary air
✅ The correct answer is option C.
2694. Aniline point is a property of the
diesel
LPG
naphtha
gasoline
✅ The correct answer is option C.
2695. Height of coke oven is limited (say maximum upto 7 metres) mainly by the
Problem of uniform heating along its height
Structural strength of silica bricks
Problem in door cleaning
Buckling of ram of pusher car at the time of coke pushing
✅ The correct answer is option A.
2696. Crude oils containing more than __________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a ‘salty crude’.
1
5
15
25
✅ The correct answer is option B.
2697. Blast furnace coke is made from coal by
Low temperature carbonisation
High temperature carbonisation
Medium temperature carbonisation
Heating the coal in an oven in presence of air
✅ The correct answer is option B.
2698. Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Low reactivity of carbonised residue containing high proportions of iron & sulphur
Low forced draught and fuel bed temperature
Thick fire bed and preheated primary air
All of the above
✅ The correct answer is option D.
2699. Catalyst used in catalytic reforming is
platinum on alumina
nickel
iron
aluminium chloride
✅ The correct answer is option A.
2700. Preheating of coal charge for the coke ovens reduces the
Time of carbonisation
Yield of gas and tar
Fuel consumption in coking
All of the above
✅ The correct answer is option D.