Natural draft created by the chimney depends upon _____________________?

Related Mcqs:

1. Natural draught produced by a chimney depends upon the _____________________?

   A. Density of the chimney gases
   B. Height of the chimney
   C. Both A. and B.
   D. Neither A. nor B.

2. The main advantage of forced draft over natural draft is that____________________?

   A. Combustion of fuel is complete
   B. Smaller height chimney can be used
   C. Furnace control is easier
   D. All A., B. & C.

3. 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

4. For maximum discharge through a chimney, its height should be___________________?

   A. 200 meters
   B. Infinitely long
   C. More than 105.7 metres
   D. Equal to the height of the hot gas column producing draught

5. 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

6. 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

7. 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

8. 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. Sulphide Coke
   C. Coke Oven Gas
   D. Pulverised coke

   Submitted by: Muhammad Mutsadiq Umer

9. The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?

   A. Type (solid, liquid or gaseous)
   B. Calorific value
   C. Sulphur content
   D. Ignition temperature

10. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?

    A. Less reactive
    B. Stronger
    C. Smaller in size
    D. All A., B. & C.