Steam Boilers, Engines, Nozzles and Turbines
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

Four times the height of chimney
One-half the height of chimney
Equal to the height of chimney
Two times the height of chimney

ANSWER DOWNLOAD EXAMIANS APP

Steam Boilers, Engines, Nozzles and Turbines
Coke is produced by

Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Pulverizing coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Enriching carbon in the coal

ANSWER DOWNLOAD EXAMIANS APP