Lengthens the flame
Causes heat loss of fuel by its partial combustion
Both A & B
Shortens the flame
✅ The correct answer is option C.
Engineering
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2722. Most widely used solvent for dewaxing is
methyl-ethyl-ketone (MEK)
naphtha
petroleum ether
sodium plumbite
✅ The correct answer is option A.
2723. Which of the following has the minimum °API gravity of all?
Diesel
Kerosene
Petrol
Furnace oil
✅ The correct answer is option D.
2724. Percentage of carbon monoxide in blast furnace gas may be around
8
14
22
52
✅ The correct answer is option C.
2725. Which of the following has the highest heat of combustion?
H₂
CO
CH₄
C₂H₆
✅ The correct answer is option D.
2726. Catalyst used in alkylation process is
sulphuric acid
nickel
silica gel
alumina
✅ The correct answer is option A.
2727. A sooty flame can be made non-luminous by
Admitting more gas
Shutting gas supply
Admitting more air
Shutting air supply
✅ The correct answer is option C.
2728. Traces of tar fog present in the coke oven gas is removed by
Cyclone separator
Wet packed scrubber
Electrostatic precipitator
Washing with monoethanolamine
✅ The correct answer is option C.
2729. Performance number of a liquid fuel is related to its
wax content
spontaneous ignition temperature
knocking tendency
sulphur content
✅ The correct answer is option B.
2730. Higher pressure in the reforming reactor
increases coke formation.
increases the rate of reaction.
produces high octane number gasoline.
none of these.
✅ The correct answer is option D.