Question 462Steam Plants - Assistant Engineer70% to pass
The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine. The admission of steam is normally regulated by a _______________.
AI Explanation
The correct answer is B) constant pump discharge pressure governor.
The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine. The admission of steam is normally regulated by a constant pump discharge pressure governor. This governor maintains a constant discharge pressure from the boiler feed pump by adjusting the amount of steam admitted to the auxiliary turbine, which in turn controls the pump's speed and output.
The other options are incorrect because: A) a flyweight controlled regulating valve is not specifically used to control the boiler feed pump discharge; C) a multi-nozzle arrangement is not the primary means of regulating the steam admission; and D) a constant speed limiting governor would maintain a fixed pump speed rather than adjusting it to maintain constant discharge pressure.
Related Questions
#460 If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur? #461 A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by _______________.#463 To prevent pulsations from developing in the boiler feed water lines, the discharge side of a reciprocating feed pump is equipped with a/an _______________.#464 During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed? #465 The pressure in the feed water system must exceed boiler steam drum pressure in order to _______________.