Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To convert heat energy of the steam into mechanical work
To guide motion of the piston rod and to prevent it from bending
To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head

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Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Increase the temperature of saturated steam without raising its pressure

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

None of these
Forced circulation takes place
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water

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