Steam Boilers, Engines, Nozzles and Turbines
Efficiency of Rankine cycle can be increased by

Increasing the expansion ratio
Decreasing initial steam pressure and temperature
Increasing exhaust pressure
Decreasing exhausts pressure

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To discharge the gases of combustion to the atmosphere through the chimney
To provide an adequate supply of air for the fuel combustion
All of the listed here
To exhaust the gases of combustion from the combustion chamber

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