Higher fuel combustion efficiency cannot be achieved by_________________?

Related Mcqs:

1. Higher efficiency in the combustion of solid fuel cannot be achieved by________________?

   A. Proper fuel preparation
   B. Keeping the flue gas exhaust temperature very high
   C. Adopting efficient-fuel firing technique & equipment
   D. Supplying correct quantity of combustion air

2. For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?

   A. Increase
   B. Decrease
   C. Increase or decrease depending on the fuel type
   D. Not change

3. Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?

   A. % of CO2 in
   B. % of O2in
   C. Temperature of
   D. Colour of

4. Use of excess of combustion air in the combustion of fuels results in__________________?

   A. Heat losses
   B. Long flame
   C. Condensation of water vapour from the fuel gas
   D. None of these

5. Deficiency of combustion air during combustion of a gaseous fuel_____________________?

   A. Lengthens the flame
   B. Causes heat loss of fuel by its partial combustion
   C. Both A. & B.
   D. Shortens the flame

6. Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?

   A. Smoke
   B. Temperature
   C. Oxygen
   D. Carbon monoxide

7. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?

   A. CO
   B. CO2
   C. H2O
   D. Both B. & C.

8. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?

   A. Low
   B. High
   C. Very high, if the fuel is of low calorific value
   D. None of these

9. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?

   A. Fire point
   B. Smoke point
   C. Burning temperature
   D. Kindling temperature

10. Fuel combustion is never cent per cent efficient due to___________________?

    A. Incomplete combustion
    B. Dry gas/stack gas loss
    C. Moisture loss
    D. All A., B. and C.