Fuel Combustion and Steam Generation pdf Practice Test - Set 13 - ObjectiveBooks
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Fuel Combustion and Steam Generation pdf Practice Test - Set 13

Practice Test: Question Set - 13

1. Blast furnace gas compared to coke oven gas has
    (A) Lower ignition temperature
    (B) Narrower limit of inflammability
    (C) Higher calorific value
    (D) Lower theoretical flame temperature

2. Coal tar (produced by high temperature carbonization) is the main source of
    (A) Aromatic compounds
    (B) Aliphatic compounds
    (C) Paraffins
    (D) Olefins

3. Pick out the wrong statement.
    (A) Cokes of high reactivity are obtained from weakly coking coals
    (B) Cokes of high reactivity are obtained from strongly coking coals
    (C) Reactivity of coke is inversely proportional to its absolute density
    (D) Abrasion index of the coke is a measure of its hardness

4. Ionization potential applied across the electrodes of electrostatic tar precipitator is around
    (A) 230 V AC
    (B) 60 KV AC
    (C) 230 V DC
    (D) 60 KV DC

5. Which of the following is a poisonous fuel gas?
    (A) Coke oven gas
    (B) Blast furnace gas
    (C) Natural gas
    (D) None of these

6. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertilizer plant) employs a/an __________ bed gasifier.
    (A) Entrained
    (B) Moving
    (C) Fixed
    (D) Fluidized

7. Use of preheated air for combustion of fuel in the furnace, increases the
    (A) Scale losses of the furnace stock
    (B) Calorific value of the fuel
    (C) Flame temperature
    (D) None of these

8. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
    (A) Is less liable to spontaneous combustion on storage
    (B) Is more difficult to ignite and produces a shorter flame
    (C) Requires smaller combustion space and less secondary air
    (D) None of these

9. Which of the following is unsuitable fuel for producer gas manufacture?
    (A) Coke
    (B) Anthracite
    (C) Coal having low fusion point of its ash
    (D) Coal having high fusion point of its ash

10. The calorific value is the highest out of the following for
    (A) Producer gas
    (B) Water gas
    (C) Coke oven gas
    (D) Blast furnace gas

11. A coal having higher volatile matter content, has lower
    (A) Smoking tendency on burning
    (B) Coke oven gas yield on carbonization
    (C) Chance of catching fire during storage in open space
    (D) Ignition temperature

12. Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
    (A) 6
    (B) 12
    (C) 18
    (D) 24

13. Caking coal is desirable for
    (A) Burning on travelling grate
    (B) Coke making
    (C) Burning on fire bars
    (D) All (a), (b) and (c)

14. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
    (A) Fire point
    (B) Smoke point
    (C) Burning temperature
    (D) Kindling temperature

15. Coals used for the generation of producer gas should have
    (A) High caking index
    (B) Low fusion point of ash
    (C) High volatile matter content
    (D) Very low ash content (8-10%)

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