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

Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
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

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Steam Boilers, Engines, Nozzles and Turbines
Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

Chances of explosion are less in former case
Former occupies less space for same power
Former is used for high installed capacity
Rate of steam flow is more in former case

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