Question 93Steam Plants - Assistant Engineer70% to pass
The purpose of the steam control valves installed in the auxiliary exhaust line is to _______________.
AI Explanation
The correct answer is B) control steam admission and maintain the proper steam spray pattern in the DC heater.
The steam control valves installed in the auxiliary exhaust line are used to regulate the flow of steam into the DC (deaerating) heater. This is necessary to maintain the proper steam spray pattern and ensure efficient deaeration of the condensate before it enters the main condenser. The steam control valves allow the operator to adjust the steam flow to match the system's demands and maintain the proper operating conditions in the DC heater.
The other answer choices are incorrect because they do not accurately describe the purpose of the steam control valves in the auxiliary exhaust line. Option A is incorrect as the valves do not preheat the condensate. Option C is incorrect as the valves do not regulate back pressure in the desuperheater line. Option D is incorrect as the valves do not seal the vent condenser.
Related Questions
#91 When raising steam on a cold boiler under normal conditions, you should always _______________.#92 While raising steam on a cold boiler, the air cock is to be closed after _______________.#94 A high water level in a deaerating feed heater will cause the automatic dump valve to drain condensate to the _______________.#95 Which of the listed conditions aids in directing gland leak off steam from the low- pressure propulsion turbine to pass through the gland exhaust condenser? #96 Vent condensers are usually an integral part of deaerating feed heaters and serve to condense _______________.