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

Related Mcqs:

1. 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

2. 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

3. Natural draft created by the chimney depends upon _____________________?

   A. Temperature of the flue gas
   B. Its height
   C. Both A. & B.
   D. Neither A. nor B.

4. 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

5. 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.

6. 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

7. 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

8. The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be___________________?

   A. 27.6
   B. 23
   C. 47.3
   D. 42.9

9. The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be___________________?

   A. y
   B. 0.95 y
   C. 1.05 y
   D. 1.8 y

10. Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?

    A. Problem of uniform heating along its height
    B. Structural strength of silica bricks
    C. Problem in door cleaning
    D. Buckling of ram of pusher car at the time of coke pushing