FUELS AND COMBUSTION QUIZ

Removing ash from the coal based on difference in specific gravity of coal and ash

Washing fine coal dust (< 0.5 mm size)

All of these

Washing lump coal (> 80 mm size)

None of these

Pulverised coal

Gaseous fuels

Fuel oil

10

50

0.5

500

Medium temperature carbonisation

Heating the coal in an oven in presence of air

High temperature carbonisation

Low temperature carbonisation

Yield of tar is about 3% of dry coal

Yield of coke oven gas is 290 Nm³ /ton dry coal

Temperature maintained is 700°C

Volatile matter in coke is zero

Power consumption in grinding the coal will be very high

Coal can be pulverised with great difficulty

Coal can't be pulverised

Coal can be easily pulverised

None of these

Facilitate uniform heating of the oven

Increase the output of the coke

Facilitate easy discharging of coke as it swells during carbonisation

Have high calorific value

Have high adiabatic flame temperature

Require smaller combustion chamber

None of these

Finding out combustion efficiency

Gravimetric analysis of flue gas

Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

None of these

70-100

15-30

150-200

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