when coal is first dried and then crushed to a fine powder by pulverising machine

from the finely ground coal by moulding under pressure with or without a binding material

when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

by heating wood with a limited supply of air to a temperature not less than 280 Degree Centigrade

1 N-m

1 kN-m

10 N-m/s

10 kN-m/s

isothermal process

adiabatic process

hyperbolic process

polytropic process

Correct

Incorrect

vapour

perfect gas

air

steam