Question 588Steam Plants - Assistant Engineer
70% to passThe jacking gear must be engaged as quickly as possible when securing the main turbines in order to _______________.
Apermit rapid cooling of the reduction gears
Bmaintain a constant supply of lube oil to the main unit
Cprevent the stern tube bearing from overheating
Dprevent uneven cooling of the turbine rotors
AI Explanation
The correct answer is D) prevent uneven cooling of the turbine rotors. When securing the main turbines, the jacking gear must be engaged as quickly as possible to prevent uneven cooling of the turbine rotors. This is because rapid cooling can cause thermal distortion and stresses in the rotor, which can lead to damage. Engaging the jacking gear helps maintain an even, controlled cooling process to avoid these issues. The other options are incorrect because they do not directly address the need to prevent uneven cooling of the turbine rotors, which is the primary reason for engaging the jacking gear quickly when securing the main turbines.
Related Questions
Q480:Which of the following items should be checked each time the firing rate or forc... Q327:Which of the conditions listed could cause a boiler economizer to leak? Q365:A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet... Q257:A variable capacity, pressure atomizing, fuel oil burner functions to __________... Q277:If the stack temperature is higher than normal, this could indicate ____________...
Ready to test your knowledge?
Take a Steam Plants - Assistant Engineer Practice ExamOfficial Resources