Fuel Combustion Chemical Reaction MCQ with Answers - Set 31 - ObjectiveBooks

Fuel Combustion Chemical Reaction MCQ with Answers - Set 31

Practice Test: Question Set - 31

1. Blast furnace gas burns with a bluish flame, because of the presence of
    (A) CO
    (B) CH4
    (C) CO2
    (D) S

2. Air/gas ratio for complete combustion will be the highest for
    (A) LPG
    (B) Gobar (cow dung) gas
    (C) Coke oven gas
    (D) Carburetted water gas

3. Yield of coke oven gas in low temperature carbonization of coal is about __________ Nm3 /ton of dry coal.
    (A) 60
    (B) 160
    (C) 500
    (D) 750

4. Calorific value of furnace oil is about __________ Kcal/kg.
    (A) 10,000
    (B) 15,000
    (C) 5,000
    (D) 20,000

5. Orsat apparatus is meant for
    (A) Gravimetric analysis of flue gas
    (B) Finding out combustion efficiency
    (C) Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
    (D) None of these

6. During combustion of gaseous fuels, deficiency of air
    (A) Lengthens the flame
    (B) Tends to shorten the flame
    (C) Does not affect the flame length
    (D) Increases the flame temperature

7. The combustion reaction, C + O2 = CO2, is
    (A) Exothermic
    (B) Endothermic
    (C) Autocatalytic
    (D) None of these

8. Yield of charcoal in high temperature carbonization of wood is about __________ percent.
    (A) 10
    (B) 25
    (C) 50
    (D) 75

9. Which of the following constituents of coal is the most important in the production of coke?
    (A) Moisture
    (B) Ash
    (C) Volatiles
    (D) Carbon

10. Fixed carbon in coal is defined as
    (A) That present in volatile matters
    (B) The total quantity of carbon present in the coal
    (C) Hundred minus the percentage of volatile matter, ash and moisture
    (D) The one which is present in the residue after combustion

11. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
    (A) Carbon tetrachloride
    (B) Sand (40%)
    (C) Mineral oil of high viscosity & specific gravity (1.6)
    (D) None of these

12. A coal having high amount of volatile matter
    (A) Would require smaller combustion chamber
    (B) Produces very little of tar and gas on carbonization
    (C) Ignites easily and burns with long smoky flame
    (D) All (a), (b) and (c)

13. Quantity of coke produced from metallurgical coal may be around __________ percent.
    (A) 30
    (B) 50
    (C) 75
    (D) 95

14. Which of the following is not a manufactured fuel?
    (A) Coke breeze
    (B) Soft coke
    (C) Colloidal fuels
    (D) Charcoal

15. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
    (A) < 37%
    (B) > 71%
    (C) In between 37 & 71%
    (D) None of these

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