greater than
less than
equal to
none of these
partial combusion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
carbonisation of bituminous coal
passing steam over incandescent coke
passing air and a large amount of steam over waste coal at about 650 Degree Centigrade
wood
coke
anthracite coal
pulverised coal
the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
all the processes, taking place in the cycle of operation, must be extremely slow
the working parts of the engine must be friction free
all of the above
the indirect heat exchanger and cooler is avoided
direct combustion system is used
a condenser is used