Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

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

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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 transfer motion from the piston to the cross head
To exhaust steam from the cylinder at proper moment

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To determine the generating capacity of the boiler
All of these
To prepare heat balance sheet for the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure

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