Chemical MCQ about Combustion Fuels and Flame - Set 05 - ObjectiveBooks

Chemical MCQ about Combustion Fuels and Flame - Set 05

Practice Test: Question Set - 05

1. Volumetric ratio of N2 to O2 in dry atmospheric air is
    (A) 0.21
    (B) 3.76
    (C) 4.76
    (D) 0.79

2. Gross calorific value will be equal to the net calorific value for
    (A) H2
    (B) C2H2
    (C) CO
    (D) C2H6

3. __________ prohibits the use of alcohols directly in petrol engines.
    (A) Low octane number
    (B) High cost & availability
    (C) Low flash point
    (D) Low calorific value

4. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomization through burners is
    (A) 200 °F
    (B) 200 °C
    (C) 200 °K
    (D) 200 °R

5. Highly reactive coke have lower
    (A) Porosity
    (B) Coke reactivity index (CRI)
    (C) Critical air blast (CAB) value
    (D) Both (b) and (c)

6. The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be
    (A) 27.6
    (B) 23
    (C) 47.3
    (D) 42.9

7. Natural draught produced by a chimney depends upon the
    (A) Density of the chimney gases
    (B) Height of the chimney
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

8. The hottest part of the flame lies in its _________zone.
    (A) Non-luminous
    (B) Luminous
    (C) Yellow
    (D) Unburnt gases

9. Width of the coke oven towards coke side is slightly more than that on pusher side to
    (A) Facilitate easy discharging of coke as it swells during carbonization
    (B) Facilitate uniform heating of the oven
    (C) Increase the output of the coke
    (D) None of these

10. Highly caking coals
    (A) Produce weak coke
    (B) Produce strong coke
    (C) May damage the coke oven walls during carbonization
    (D) Both (b) and (c)

11. Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)?
    (A) Producer gas
    (B) Carburetted water gas
    (C) Natural gas
    (D) Liquefied petroleum gas

12. Pick out the wrong statement.
    (A) Pulverized fuel can be completely burnt with less percentage of excess air compared to lump coal
    (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverized fuel
    (C) Regulation of furnace temperature and atmosphere (oxidizing or reducing) is easily possible with pulverized fuel firing
    (D) None of these

13. Preheating of coal charge for the coke ovens reduces the
    (A) Time of carbonization
    (B) Yield of gas and tar
    (C) Fuel consumption in coking
    (D) All (a), (b) and (c)

14. L.D. converter gas (produced in steel plant) comprises mainly of
    (A) CO (upto 65%) & CO2
    (B) CO2 & H2
    (C) CO & O2
    (D) CO2 & O2

15. Washing of coal does not reduce its
    (A) S & P content
    (B) Heating value
    (C) Fusion point of ash
    (D) None of these

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