Question 435Steam Plants - Assistant Engineer
70% to passIf the DC heater relief valve lifts frequently, the cause can be excessive _______________.
Acondensate supplied to the DC heater
Bfeed water recirculated from the feed pump
Cmakeup feed introduced to the system
Dauxiliary exhaust steam pressure
AI Explanation
The correct answer is D) auxiliary exhaust steam pressure. The frequent lifting of the DC heater relief valve indicates that the pressure in the DC heater is exceeding the set pressure of the relief valve. This excessive pressure can be caused by high auxiliary exhaust steam pressure, which is supplied to the DC heater. The other options (A, B, and C) do not directly cause excessive pressure in the DC heater that would lead to the relief valve lifting frequently.
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