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

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

To convert reciprocating motion of the piston into rotary motion of the crank
To provide reciprocating motion to the slide valve
To provide simple harmonic motion to the D-slide valve
To convert rotary motion of the crankshaft into to and fro motion of the valve rod

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in moving blades only
The pressure and temperature of steam remains constant

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