Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the chimney
Efficiency of the fan
Power of the boiler
Efficiency of the boiler

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

None of these
To transfer motion from the piston to the cross-head
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
To guide motion of the piston rod and to prevent it from bending

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