Increases
Decreases
Remains same
May increase or decrease ; depends on the type of fuel
✅ The correct answer is option B.
Chemical Engineering MCQs
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
60
160
500
750
✅ The correct answer is option B.
When incomplete combustion loss is high, the flue gas analysis shows large amount of
CO₂
CO
O₂
C
✅ The correct answer is option B.
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
✅ The correct answer is option A.
Turndown ratio of a gas burner is equal to the
Maximum to minimum heat input ratio
Maximum to minimum permissible gas flow rate
Both A & B
Minimum to maximum heat input ratio
✅ The correct answer is option C.
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in
Air
Oxygen
Either A or B
Either A or C without gain or loss of heat
✅ The correct answer is option D.
Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
aluminium phosphate
water
lime
plaster of paris
✅ The correct answer is option B.
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
preheating
cooling
burning
all
✅ The correct answer is option C.
Dolomite bricks have good resistance to attack by
molten steel
iron oxide
lime slag
none of these
✅ The correct answer is option A.
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
cost
electrical conductivity
thermal conductivity
fusion point
✅ The correct answer is option A.