Fuels and Combustion Engineering Chemical Practice Test - Set 02 - ObjectiveBooks
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Fuels and Combustion Engineering Chemical Practice Test - Set 02

Practice Test: Question Set - 02


1. KOH solution used in Orsat apparatus absorbs
    (A) CO2
    (B) SO2
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

2. The gas which contributes maximum to the heating value of natural gas is
    (A) CO
    (B) CO2
    (C) H2
    (D) CH4

3. The heat of combustion of a fuel
    (A) Is equal to the heat of formation
    (B) Is always negative
    (C) Can’t be known without calculating it
    (D) Is always positive

4. Nitrogen in coal
    (A) Is present upto 1-2%
    (B) Comes from protein in parent vegetable matter
    (C) Is recovered as ammonia during its carbonization
    (D) All (a), (b) and (c)

5. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
    (A) Calorific value of the fuel
    (B) Flame temperature achieved
    (C) Speed of combustion of fuel
    (D) Heat transfer rate to the stock in the furnace

6. Calorific value of blast furnace gas is around __________ KCal/Nm3.
    (A) 850
    (B) 1800
    (C) 4200
    (D) 6500

7. Coking time in beehive coke oven is about
    (A) 12 hours
    (B) 2-3 days
    (C) One week
    (D) Two weeks

8. Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
    (A) 15 to 25
    (B) 35 to 45
    (C) 55 to 75
    (D) 75

9. Which of the following would require least amount of secondary air for combustion?
    (A) Coke breeze containing 25% ash and 2% volatile matter
    (B) Anthracite containing 10% volatile matter and 8% ash
    (C) Bituminous coal containing 20% ash and 25% volatile matter
    (D) Semi-bituminous coal containing 25% ash and 20% volatile matter

10. Which of the following is not a binder for coal briquetting?
    (A) Coal tar
    (B) Bitumen
    (C) Molasses
    (D) None of these

11. Bulk density of pulverized coal may be about __________ kg/m3.
    (A) 100
    (B) 500
    (C) 1000
    (D) 1500

12. Which of the following is the maximum coal producing state in India?
    (A) Orissa
    (B) West Bengal
    (C) Jharkhand
    (D) Assam

13. Pick out the wrong statement.
    (A) Angle of repose of coal increases with its increasing size
    (B) Specific gravity of coal increases with its increasing maturity
    (C) Refractive index and reflectance of coal increases with the increasing rank of coal
    (D) Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal

14. A coal with high ash content
    (A) Has higher calorific value
    (B) Is harder and stronger
    (C) Is not subjected to washing
    (D) Has low quantity of mineral matter

15. Bunsen burner is an example of a/an __________ burner.
    (A) Inside mixing/premix type
    (B) Outside mixing/diffusion flame/nozzle mix type
    (C) Rotary cup
    (D) Submerged combustion

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