Fuels and Combustion Chemical Engineering Notes MCQ - Set 07 - ObjectiveBooks

Fuels and Combustion Chemical Engineering Notes MCQ - Set 07

Practice Test: Question Set - 07

1. __________ present in coal is not determined in its ultimate analysis.
    (A) Fixed carbon
    (B) Total carbon
    (C) Hydrogen
    (D) Nitrogen

2. Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
    (A) Emissivity factor is higher
    (B) Sulphur content is lower
    (C) Flue gas has lower dew point thereby facilitating more waste heat recovery
    (D) All (a), (b) and (c)

3. Calorific value of
    (A) Light paraffinic fuel oils is equal to that of equivalent olefins
    (B) n-paraffin is lower than that of iso-paraffins of the same compounds
    (C) Light paraffinic fuel oils is higher than that of equivalent olefins
    (D) Light paraffinic fuel oils is lower than that of equivalent olefins

4. Which is the most matured coal?
    (A) Lignite
    (B) Bituminous
    (C) Semi-anthracite
    (D) Anthracite

5. Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
    (A) Pitch
    (B) Fuel oil
    (C) Blast furnace gas
    (D) Bituminous coal

6. Percentage of carbon monoxide in blast furnace gas may be around
    (A) 8
    (B) 14
    (C) 22
    (D) 52

7. Compound coke ovens are those which can be heated by
    (A) Both steam and electrical power
    (B) Lean gas (e.g., B.F. gas)
    (C) Rich gas (e.g., coke oven gas)
    (D) Both (b) and (c)

8. Main use of hard coke produced by high temperature carbonization is in the
    (A) Iron blast furnace
    (B) Cupola in foundries
    (C) Sinter making
    (D) Domestic ovens

9. Which of the following is coking?
    (A) Vitrain
    (B) Fussain
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

10. For every 10% increase in the excess air; the fuel consumption increases by __________ percent.
    (A) 0.1
    (B) 0.2
    (C) 0.5
    (D) 1.0

11. Main constituents of purified Lurgi gas are
    (A) H2, CmHn & CO2
    (B) CO, H2 & CH4
    (C) CO2, O2 & CO
    (D) N2, H2 & CO2

12. A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
    (A) Higher methane content and thus higher calorific value
    (B) Higher carbon monoxide content
    (C) Lower carbon dioxide content
    (D) None of these

13. Coke compared to the coal from which it has been made, contains
    (A) Less volatile matter
    (B) More carbon
    (C) Greater percentage of ash
    (D) All (a), (b) and (c)

14. "Overfire burning" in a furnace is a phenomenon characterized by the
    (A) Supply of excess fuel
    (B) Supply of excess air
    (C) Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
    (D) None of these

15. Producer gas comprises mainly of
    (A) CO & N2
    (B) CO & H2
    (C) CO2 & N2
    (D) CO2 & H2

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