White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?

Related Mcqs:

1. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?

   A. Tar
   B. Coke oven gas
   C. Pitch
   D. Pulverised coke

2. Flue gas discharge velocity through chimney of a big thermal power plant may be around ________________ m/sec?

   A. 0.5
   B. 10
   C. 50
   D. 500

3. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?

   A. 71%
   C. In between 37 & 71%
   D. None of these

4. Stack (chimney) height in a big thermal power plant is dictated by the___________________?

   A. Pollution control aspect
   B. Draught to be created
   C. Limitation of constructional facilities
   D. None of these

5. Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?

   A. Less air for combustion
   B. Correct amount of air for combustion
   C. Too much air for combustion
   D. Pulverised coal in boilers

6. Which of the following fuels is generally not used in thermal power plant boiler firing ?

   A. Furnace oil, light diesel oil and tar/PCM
   B. Pulverised coking coal
   C. Coal middling from washeries
   D. B.F. gas, coke oven gas and L.D. converter gas

7. Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?

   A. CO content
   B. Dew point
   C. CO2 content
   D. O2 content

8. Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

   A. Multicyclones
   B. Bag filter
   C. Wet scrubber
   D. Hydrocyclones

9. Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?

   A. 25
   B. 45
   C. 65
   D. 20

10. Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?

    A. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
    B. Adiabatic flame temperature
    C. Heat release rate (thus requiring smaller combustion chamber)
    D. All A., B. and C.