Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 26 of 47)

Attempt Fuels and Combustion Quiz
Caking index of coal blend used for blast furnace coke making is about_________________?
A. 8
B. 12
C. 22
D. 36
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Calorific value of coke oven gas is around ______________ Kcal/Nm3?
A. 900
B. 4200
C. 7500
D. 2000
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Fusion point of coal ash increases with increase in its ____________ content?
A. Iron sulphate
B. Iron silicate
C. Lime and magnesia
D. All a., b. and c.
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Sulphur in metallurgical coal__________________?
A. Contributes to its heating value
B. Affects the quality of steel produced as cracks develop on the surface while rolling the steel
C. Both a. and b.
D. Neither a. nor b.
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Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?
A. 4
B. 96
C. 20
D. 40
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Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?
A. 400-500
B. 900-1000
C. 1400-1500
D. 1700-1800
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Oxygen percentage (by weight) in atmospheric air is_________________?
A. 19
B. 21
C. 23
D. 29
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The main advantage of forced draft over natural draft is that____________________?
A. Combustion of fuel is complete
B. Smaller height chimney can be used
C. Furnace control is easier
D. All a., b. & c.
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If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?
A. Low
B. High
C. Very high, if the fuel is of low calorific value
D. None of these
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Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?
A. It contains large amount of volatile matter
B. It is stored in tall heaps
C. Smaller fines are stored in large quantity
D. All a., b. and c.
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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