2684. Bunsen burner is an example of a/an __________ burner.
Inside mixing/premix type
Outside mixing/diffusion flame/nozzle mix type
Rotary cup
Submerged combustion
✅ The correct answer is option A.
2689. Paraffin base crude oil as compared to asphalt base crude gives
higher yield of straight run gasoline.
higher octane number gasoline.
lower viscosity index lube oil.
poorer yield of lube oil.
✅ The correct answer is option A.
2695. Height of coke oven is limited (say maximum upto 7 metres) mainly by the
Problem of uniform heating along its height
Structural strength of silica bricks
Problem in door cleaning
Buckling of ram of pusher car at the time of coke pushing
✅ The correct answer is option A.
2700. Preheating of coal charge for the coke ovens reduces the
Time of carbonisation
Yield of gas and tar
Fuel consumption in coking
All of the above
✅ The correct answer is option D.
2705. Which of the following theories of origin of petroleum does not explain the presence of nitrogen & sulphur compounds in crude oil?
Modern theory
Carbide theory
Engler theory
all (a), (b) and (c)
✅ The correct answer is option B.
2710. Which of the following has the least calorific value (kcal/Nm³) ?
Blast furnace gas
Coke oven gas
Sewage gas
Natural gas
✅ The correct answer is option A.
2715. Hydrofining is the most recent and effective method for the
removal of sulphur.
improvement of smoke point.
reduction of breathing loss.
improvement of viscosity index.
✅ The correct answer is option A.
2720. With increase in calorific value of fuels, their adiabatic flame temperatures
Increase
Decrease
Remain unchanged
May increase or decrease ; depends on the quantity of products of combustion
✅ The correct answer is option D.
2651. Testing of the knocking characteristics of petrofuels is done in a __________ engine.
Carnot
CFR (Co-operative fuel research)
Stirling
diesel
✅ The correct answer is option B.
2656. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.
30
300
3000
30, 000
✅ The correct answer is option B.