2591. A good lubricant should have high
viscosity index
volatility
pour point
none of these
✅ The correct answer is option A.
Chemical Engineering
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2592. Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Less air for combustion
Correct amount of air for combustion
Too much air for combustion
Pulverised coal in boilers
✅ The correct answer is option C.
2593. Which of the following is a naphthene ?
Butene
Butadiene
Cyclohexane
Acetylene
✅ The correct answer is option C.
2594. ‘Fat coals’ are those coals which have very high
Caking capacity
Volatile matter content
Fusion point of its ash
Inherent moisture content
✅ The correct answer is option A.
2595. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Because, it alone produces unreactive coke
Both A & B
Neither A nor B
✅ The correct answer is option C.
2596. Bright coal
Contains more than 90% durain
Contains more than 90% fussain
Contains mainly vitrain & clarain and is generally coking
Is non-coking
✅ The correct answer is option C.
2597. Catalyst used in the catalytic polymerisation is
phosphoric acid on kieselghur
aluminium chloride
nickel
vanadium pentaoxide
✅ The correct answer is option A.
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.
2599. Which is the most undesirable component in kerosene ?
Aromatics
i-paraffins
n-paraffins
Naphthenes
✅ The correct answer is option A.
2600. Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
cracking
polymerisation
reforming
isomerisation
✅ The correct answer is option C.