Fuels, Combustion and Flame

   Larger and irregular lumps of solid fuel (e.g. coal) when fired in a boiler or furnace may lead to

• low thermal efficiency           

• high excess air    

• large unburnt particles in the ash

• all of the above

Calculate the maximum theoretical temperature (t) attained when hydrogen is burnt in oxygen . The heat of combustion of hydrogen to water vapour is 57.8 Kcals. The specific heat of water vapour is [ 0.463 + 6.2x 10^-5t] t cals/g.

• 4580⁰ C                

• 4480⁰C

• 4308⁰C      

• 4380⁰C

PCRA stands for

• pollution control research association

• petroleum conversation research association

• petroleum control research associated

• petrol, coal reserve associated

Acid rain is caused by oxides of

• sulphur, nitrogen  

• sulphur, carbon     

• carbon, nitrogen    

• phosphorous, carbon

Calculate the theoretical weight and volume of air at NTP, required for the complete combustion of 1 kg of coke

• 8889 liters          

• 8789 liters

• 8989 liters           

• 9899 liters

   Hydrogen gas obtained from natural gas is used in

• motor fuel          

• fertilizers   

• paints   

• stoves

The total amount of heat or energy produced by one kg of fuel is the

• heat content           

• net calorific value (NCV)

• gross calorific value(GCV)

• specific heat

   Refining is

• extracting petroleum gas       

• separation of various fractions of petroleum 

• heating of coal      

• sedimentation of fossil fuel

    Fuel formed under the earth’s surface by the decomposition of organic matter is called

• organic fuel            

• biogas         

• fossil fuel          

• underground fuel

  In India, vast reserves of natural gas are found in

• Tripura        

• Rajasthan           

• Maharashtra

• All of these