Fuels and Combustion - Chemical Engineering Questions and Answers

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The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .

1800

800

4500

10000

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__________ prohibits the use of alcohols directly in petrol engines.

Low octane number

High cost & availability

Low flash point

Low calorific value

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Higher fuel combustion efficiency can not be achieved by

preheating of fuel gases & combustion air.

reducing sulphur content in the fuel.

adopting proper fuel firing technique & fuel preparation.

supplying correct amount of combustion air.

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With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

increases

decreases

remains same

either (a) or (b), depends on other factors

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Which of the following is the maximum coal producing state in India ?

Orissa

West Bengal

Jharkhand

Assam

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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.

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Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

pitch

fuel oil

blast furnace gas

bituminous coal

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The hottest part of the flame lies in its____zone.

non-luminous

luminous

yellow

unburnt gases

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Bunsen burner is an example of a/an __________ burner.

inside mixing/premix type

outside mixing/diffusion flame/nozzle mix type.

rotary cup.

submerged combustion.