Fuels and Combustion Objective Questions & Answers - ObjectiveBooks
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Fuels and Combustion Objective Questions & Answers

Practice Test: Question Set - 33


1. Ignition temperature of a fuel in air is __________ that in pure oxygen.
    (A) More than
    (B) Less than
    (C) Equal to
    (D) Either more or less; depends on the type of fuel

2. In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
    (A) CO
    (B) CO2
    (C) O2
    (D) H2O

3. Which of the following gaseous fuels has the lowest calorific value?
    (A) Gobar (cow dung) gas
    (B) Refinery gas
    (C) Converter gas
    (D) Blast furnace gas

4. Which of the following fuel gases has the highest calorific value?
    (A) Natural gas
    (B) Coal bed methane (CBM)
    (C) Liquefied petroleum gas (LPG)
    (D) Sewage gas

5. Turndown ratio of a gas burner is equal to the
    (A) Maximum to minimum heat input ratio
    (B) Maximum to minimum permissible gas flow rate
    (C) Both (a) & (b)
    (D) Minimum to maximum heat input ratio

6. Which of the following is not used as a binder in coal briquetting?
    (A) Tar
    (B) Molasses
    (C) Pitch
    (D) Line

7. Which of the following has the least calorific value (kcal/Nm3)?
    (A) Blast furnace gas
    (B) Coke oven gas
    (C) Sewage gas
    (D) Natural gas

8. Pick out the wrong statement.
    (A) Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat
    (B) Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature
    (C) Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature
    (D) Adiabatic flame temperatures of actual combustions are always less than the maximum values

9. Carbon Content by weight in air dried wood may be about __________ percent.
    (A) 10
    (B) 25
    (C) 50
    (D) 80

10. As the equilibrium moisture content of the coal increases, its
    (A) Calorific value increases
    (B) Swelling number decreases
    (C) Swelling number increases
    (D) Bulk density decreases

11. Which of the following oil gasification processes is non-catalytic?
    (A) Semet-Solvay process
    (B) Segas process
    (C) Onia-Gegi process
    (D) Steam reforming of naphtha

12. Coke oven gas consists mainly of
    (A) H2 & CH4
    (B) CO & CO2
    (C) H2 & CO
    (D) CH4 & CO

13. Which of the following is not a by-product fuel?
    (A) Producer gas
    (B) Blast furnace gas
    (C) Coke oven gas
    (D) Refinery gas

14. A sooty flame can be made non-luminous by
    (A) Admitting more gas
    (B) Shutting gas supply
    (C) Admitting more air
    (D) Shutting air supply

15. Size of blast furnace grade coke is __________ mm.
    (A) 25-80
    (B) 0-15
    (C) 15-25
    (D) > 100

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