Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?

Related Mcqs:

1. 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

2. Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?

   A. Sulphur
   B. Oxygen
   C. Hydrogen
   D. Carbon

3. Net calorific value is the gross calorific value less the _______________ heat of water in the product of combustion when cooled to 15°C ?

   A. Sensible
   B. Latent
   C. Sensible and latent
   D. None of these

4. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?

   A. 400-500
   B. 900-1000
   C. 1400-1500
   D. 1700-1800

5. Gross calorific value will be equal to the net calorific value for __________________?

   A. H2
   B. C2H2
   C. CO
   D. C2H6

6. 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

7. Bomb calorimeter is used to determine the (where, GCV – Gross Calorific Value. NCV – Net Calorific Value.) ?

   A. GCV at constant pressure
   B. GCV at constant volume
   C. NCV at constant pressure
   D. NCV at constant volume

8. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg) ?

   A. Propane and acetylene
   B. Propane and LPG
   C. Sewage gas and gobar gas
   D. B.F. gas and coke oven gas

9. 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

10. Which of the following fuel gases has the highest calorific value ?

    A. Natural gas
    B. Coal bed methane (CBM)
    C. Liquefied petroleum gas (LPG)
    D. Sewage gas