2641. In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.
100
200-300
1000-10000
10
✅ The correct answer is option C.
2646. Which is the heaviest fuel gas out of the following?
Blast furnace gas
Coke oven gas
Water gas
Carburetted water gas
✅ The correct answer is option A.
2573. Which of the following reactions is undesirable in the production of catalytically reformed gasoline ?
Dehydrogenation of naphthene
Dehydrogenation of lower paraffins
Dehydrocyclisation of higher paraffins
Isomerisation of paraffins
✅ The correct answer is option B.
2578. An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.
5
15
40
60
✅ The correct answer is option C.
2583. Which of the following has the highest theoretical flame temperature ?
Blast furnace gas
Hydrogen
Acetylene
Coke oven gas
✅ The correct answer is option C.
2588. Benzene is used
As a motor fuel
As an explosive
For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)
As a perfume
✅ The correct answer is option C.
2593. Which of the following is a naphthene ?
Butene
Butadiene
Cyclohexane
Acetylene
✅ The correct answer is option C.
2598. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
more than 100
round about 100
between 50 and 100
less than 25
✅ The correct answer is option A.
2602. If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
O₂
CO
N₂
SO₂
✅ The correct answer is option D.
2607. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.
1 to 5
30 to 80
250 to 350
450 to 500
✅ The correct answer is option B.