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mechanical engineering steam boilers and engines
1. The principal function of a stop valve is to
(A): control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
(B): empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
(C): increase the temperature of saturated steam without raising its pressure
(D): put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
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