2660. With increase in density, the viscosity of petroleum products
increases
decreases
remains same
either (a) or (b)
✅ The correct answer is option A.
2665. A coal having higher volatile matter content, has lower
Smoking tendency on burning
Coke oven gas yield on carbonisation
Chance of catching fire during storage in open space
Ignition temperature
✅ The correct answer is option D.
2669. Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________ ptb (pounds per thousand barrel).
0.03
3
35
70
✅ The correct answer is option B.
2673. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Gaseous
Solid
Liquid
Both B and C
✅ The correct answer is option D.
2678. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has
high pour point and low smoke point.
low viscosity index.
high self-ingnition temperature.
all (a), (b) and.(c).
✅ The correct answer is option B.
2685. Aromatics have the highes __________ of all the hydrocarbons of same carbon atoms.
smoke point
octane number
cetane number
viscosity
✅ The correct answer is option B.
2690. The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction. n.
Neumann reversal
Shift conversion
Boudouard
Reduction
✅ The correct answer is option C.
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.
2701. Grindability index of a coal is 100. It implies that the
Coal can be pulverised with great difficulty
Coal can’t be pulverised
Coal can be easily pulverised
Power consumption in grinding the coal will be very high
✅ The correct answer is option C.
2706. Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its
molecular weight
aromatics content
both a & b
neither a nor b
✅ The correct answer is option C.