Insitu theory and drift theory are related to the____________________?

Related Mcqs:

1. 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____________________?

   A. Decolourisation of sugar
   B. Solvent recovery from air and gases
   C. Absorption of gases and vapor
   D. Electrode manufacture

2. 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.

3. 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

4. Mineral matter content (M) and ash content A. in coal are approximately related as _______________?

   A. M = 1.1A
   B. M = A
   C. M = 1.5A
   D. M = 2A

5. Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as_______________?

   A. M = 1.8 A
   B. M = 0.5 A
   C. M = 1.1 A
   D. M = A

6. 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

7. “Overfire burning” in a furnace is a phenomenon characterised by the __________________?

   A. Supply of excess fuel
   B. Supply of excess air
   C. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying
   more air
   D. None of these

8. High sulphur content in a fuel ______________ of the flue gases?

   A. Decreases the dew point
   B. Increases the dew point
   C. Reduces the combustion efficiency by limiting the permissible temperature reduction
   D. Both B. and C.

9. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?

   A. 21% excess air has been used for combustion
   B. 21% excess oxygen has been used for combustion
   C. Complete combustion of fuel has taken place
   D. No excess air has been used for combustion

10. Shatter index of the coke is a measure of its___________________?

    A. Strength
    B. Bulk density
    C. Reactivity

    D. None of these