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Blow off cock in a boiler is used to
Options:
A .  Increase the temperature of saturated steam without raising its pressure
B .  Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
C .  Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
D .  Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Answer: Option B

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