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

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
To convert reciprocating motion of the piston into rotary motion of the crank

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

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
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power
Ratio of thermal efficiency to the Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam

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