Question 589Steam Plants - Assistant Engineer
70% to passIn securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to _______________.
Ainsure equal cooling of the main turbine bearings
Bprevent excessive condensate depression
Cremove the excessive amount of non-condensable vapors which accumulated during maneuvering operations
Ddry out the main turbines
AI Explanation
The correct answer is D) dry out the main turbines. When securing the main turbines, leaving the steam to the second stage air ejectors on for a short period of time helps to dry out the main turbines. This prevents condensation from building up inside the turbines, which could lead to corrosion and damage if left unchecked. The other answer choices are incorrect because: A) Ensuring equal cooling of the main turbine bearings is not the primary reason for leaving the steam to the air ejectors on. B) Preventing excessive condensate depression is not the main purpose in this scenario. C) Removing non-condensable vapors is not the main objective when securing the turbines.
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