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

Related Mcqs:

1. 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.

2. Main constituent of natural gas is ________________?

   A. CH4 (upto 90%)
   B. C2H6
   C. C3H8
   D. H2

3. The advantage of firing pulverised coal in the furnace lies in the fact, that it____________________?

   A. Permits the use of high ash content coal
   B. Permits the use of low fusion point ash coal
   C. Accelerates the burning rate and economises on fuel combustion
   D. All A., B. and C.

4. The gas which contributes maximum to the heating value of natural gas is __________________?

   A. CO
   B. CO2
   C. H2
   D. CH4

5. A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?

   A. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
   B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
   C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
   D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

6. 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.

7. The calorific value of natural gas is about ______________ kcal/Nm3?

   A. 10,000
   B. 2,500
   C. 25,000
   D. 35,000

8. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?

   A. Iron blast furnace
   B. Cupola in foundries
   C. Sinter making
   D. Domestic ovens

9. The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to___________________?

   A. Minimise its corrosion
   B. Avoid radiation heat loss
   C. Make it look attractive
   D. None of these

10. Main use of soft coke is as _______________ fuel?

    A. Domestic
    B. Blast furnace
    C. Foundry
    D. None of these