Abradability
Grindability
Weathering properties
Caking and swelling properties
✅ The correct answer is option D.
Engineering
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2762. Washing of coal decreases its
Caking index
Mineral matter content
Ash content
Both B and C
✅ The correct answer is option B.
2763. In general, the limit of inflammability/explosion limit of fuel gases is widened by the
Increase in gas pressure
Increase in temperature (i.e. preheating)
Use of pure oxygen for combustion instead of air
All of the above
✅ The correct answer is option D.
2764. Calorific value of furnace oil is about __________ Kcal/kg.
10000
15000
5000
20000
✅ The correct answer is option A.
2765. The main reaction in reforming is the
dehydrogenation of naphthenes.
hydrogenation of naphthenes.
hydrocracking of paraffins.
saturation of olefins.
✅ The correct answer is option A.
2766. Catalyst used in the catalytic cracking is
silica-alumina
silica gel
vanadium pentoxide
nickel
✅ The correct answer is option A.
2767. Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about __________ kg/cm2 .
1.5
3
6
12
✅ The correct answer is option B.
2768. The octane number of aviation gasoline may be
79
87
97
>100
✅ The correct answer is option D.
2769. Sulphuric acid treatment of petroleum products removes the __________ materials.
gum forming
color forming
asphaltic
all (a), (b) & (c)
✅ The correct answer is option D.
2770. With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion
Increases
Decreases
Remains same
Either A or B, depends on other factors
✅ The correct answer is option A.