Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the____________________?

Related Mcqs:

1. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?

   A. 1
   B. < 1
   C. > 1
   D. Unpredictable

2. Yield of charcoal in high temperature carbonisation of wood is about _____________ percent?

   A. 10
   B. 25
   C. 50
   D. 75

3. Carbon Content by weight in air dried wood may be about _______________ percent?

   A. 10
   B. 25
   C. 50
   D. 80

4. Light oil whose major component is Benzol, is obtained by the distillation of crude tar in the temperature range of _____________ °C?

   A. 80-170
   B. 200-300
   C. 250-270
   D. 280-300

5. A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?

   A. More
   B. Less
   C. Same
   D. Data insufficient; can’t be predicted

6. The difference between total carbon and fixed carbon of coal will be minimum in case of___________________?

   A. Lignite
   B. Bituminous coal
   C. Anthracite
   D. High temperature coke (V.M < 0.5%)

7. 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

8. Insitu theory and drift theory are related to the____________________?

   A. Origin of petroleum oil
   B. Origin of coal
   C. Coalification
   D. Variation of coal quality with depth

9. Low temperature oxidation of coal is accelerated by the____________________?

   A. Storage in large heaps
   B. Storage in compressed piles
   C. Absence of porous or friable particles
   D. All A., B. and C.

10. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?

    A. Incomplete combustion
    B. Complete combustion
    C. High oxygen in flue gas
    D. None of these