2615. “Breathing loss” on storage of gasoline occurs due to the
presence of unsaturated air.
fluctuation of ambient temperature during day and night.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option B.
2620. Advantages of fluidised bed combustion are
Reduced NOx formation in flue gas
Lower furnace operating temperature
High heat transfer rate
All of the above
✅ The correct answer is option D.
2625. The average boiling point of aviation turbine fuel is closest to that of
lubricating oils
LPG
diesel
Kerosene
✅ The correct answer is option D.
2630. Tar is a better fuel than furnace oil, because of its
Higher calorific value
Lower sulphur content
Higher emissivity (0.8 – 0.9) resulting in higher radiation heat transfer rate
Both A & B
✅ The correct answer is option D.
2635. With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
decreases
increases
remains same
unpredictable from the data
✅ The correct answer is option B.
2640. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Caking index
Yield of carbonised products
Friability & oxygen content
Calorific value
✅ The correct answer is option C.
2645. Deoiling is the process of removal of oil from wax. It is done by the __________ process.
solvent extraction
sweating
resettling
all (a), (b) & (c)
✅ The correct answer is option D.
2572. Coal containing large quantity of __________ are difficult to wash.
Ash
Inherent mineral matter
Free impurities
Volatile matter
✅ The correct answer is option B.
2577. Platforming is a __________ process.
moving bed
fluidised bed
non-regenerative & fixed bed
regenerative
✅ The correct answer is option C.
2582. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Shallow and small piles
Fine sizes without the presence of any lump
Closed space without any ventilation facility
Large heaps with small surface to volume ratio
✅ The correct answer is option A.