Carbonisation of coal is the process of
Which of the following is steam coal?
The crown of the fire box is made hemispherical in order to
Hard coke is used in
Which of the following varieties of coals is mostly used in steam boilers?
Green coal, in order to be burnt, must be
Incomplete combustion can be best judged by
The fuel mostly used in boilers is
Non-coking bituminous coal is the fuel mostly used in boiler.
Calorific value of steam coal lies in the range of
The calorific values of the common coal varieties are:
Peat = 21000 kJ/kg
Lignite = 25000 kJ/kg
Bituminous = 33500 kJ/kg
The percentage of carbon in bituminous coal is of the order of