Question 254Steam Plants - 1st Asst/Chief
70% to passScale in the air ejector first-stage nozzle could cause a decrease in the _______________.
Acondensing temperature in the condenser
Blow pressure turbine exhaust temperature
Cair ejector steam supply pressure
Dcondenser vacuum
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.
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