2612. Which of the following has the highest calorific value (kcal/Nm³) ?
Carburetted water gas
Gobar gas
Natural gas
LPG
✅ The correct answer is option D.
2617. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
propane & phenol-cresol mixture.
methyl ethyl ketone & glycol.
phenol & furfural.
propane & liquid sulphur dioxide.
✅ The correct answer is option A.
2622. High ash containing coke
Produces more slag when used in the blast furnace
Has poor strength and abrasion resistance
Is desirable in producer gas manufacture
None of these
✅ The correct answer is option A.
2627. Flash point of a liquid petroleum fuel gives an idea about its
volatility.
explosion hazards characteristics.
nature of boiling point diagram.
all (a), (b) and (c)
✅ The correct answer is option D.
2632. Which of the following fuel gases has the highest calorific value ?
Natural gas
Coal bed methane (CBM)
Liquefied petroleum gas (LPG)
Sewage gas
✅ The correct answer is option C.
2637. Which is almost absent in crude petroleum?
Olefins
Mercaptans
Naphthenes
Cycloparaffins
✅ The correct answer is option A.
2642. Artificial draught produced by a fan can be controlled by the
Speed of the fan
Damper
Variation in the pitch of the fan blades
All of the above
✅ The correct answer is option D.
2647. Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely mis-cible. It means that the aniline point of the diesel is __________ the room temperature.
more than
less than
same as
either more or less; depends on the room temperature
✅ The correct answer is option C.
2574. With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
Hydrogen
Methane
Unsaturated hydrocarbons
All of the above
✅ The correct answer is option A.
2579. Natural gasoline is produced
from oil wells
in oil refineries
by natural gas stripping
none of these
✅ The correct answer is option C.