201) When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

202) The process is adiabatic, if the value of n in the equation pvⁿ = C, is

203) The molecular mass of a substance is the number of times a molecule of that substance is heavier than the hydrogen atom.

204) The behaviour of super-heated vapour is similar to that of

205) Briquetted coal is produced from the finely ground coal by moulding under pressure with or without a binding material.