Question 254Steam Plants - 1st Asst/Chief70% to pass
Scale in the air ejector first-stage nozzle could cause a decrease in the _______________.
AI Explanation
The correct answer is D) condenser vacuum.
Scale in the air ejector first-stage nozzle can cause a decrease in the condenser vacuum. This is because the scale buildup in the nozzle will restrict the flow of air and other non-condensable gases being removed from the condenser, resulting in a higher pressure in the condenser and a decrease in the overall vacuum.
The other options are incorrect because scale in the air ejector nozzle would not directly affect the condensing temperature in the condenser (A), the low-pressure turbine exhaust temperature (B), or the air ejector steam supply pressure (C). The primary impact would be on the condenser vacuum.
Related Questions
#252 While maneuvering out of port, you answer a stop bell. You notice a lot of steam coming out of the gland exhaust condenser vent, in addition to the main condenser hotwell level being low. For this condition you should _______________.#253 During maneuvering on a steam vessel, the condenser vacuum begins to decrease when the turbines are slowed for a slow ahead bell. Which of the following should be checked? #255 While underway it is noticed that the main air ejector is having a hard time maintaining vacuum in the main condenser. When switching to the standby unit the vacuum returns to normal. Which of the following could be a possible cause? #256 Salt water contamination of condensate could occur at which component? #257 Which of the conditions listed could prevent a centrifugal condensate pump from developing its rated capacity?