2587. CnH2n is the general formula for
olefins
naphthenes
both (a) and (b)
neither (a) nor (b)
✅ The correct answer is option C.
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.
2597. Catalyst used in the catalytic polymerisation is
phosphoric acid on kieselghur
aluminium chloride
nickel
vanadium pentaoxide
✅ The correct answer is option A.
2606. Flash point of motor gasoline may be around __________ °C.
10
45
100
150
✅ The correct answer is option B.
2611. In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by
Potassium hydroxide
Cuprous chloride
Alkaline pyragllol solution
None of these
✅ The correct answer is option C.
2616. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to
increase the yield of light distillates.
suppress coke formation.
enhance the octane number of gasoline.
reduce gum content in gasoline.
✅ The correct answer is option B.
2621. For long flame and easy ignition, the coal used should have
High volatile matter
Low ash
High calorific value
High ash
✅ The correct answer is option A.
2626. Size of blast furnace grade coke is __________ mm.
25-80
0-15
15-25
>100
✅ The correct answer is option A.
2631. Feed for reforming is generally
naphtha or straight run gasoline.
reduced crude.
vacuum gas oil.
atmospheric gas oil.
✅ The correct answer is option A.
2636. Presence of free moisture in coal is most disadvantageous during
Its pulverisation (as it requires more power)
Combustion of fire slacks on the grates
Handling (e.g. when emptying wagons)
None of these
✅ The correct answer is option A.