Question 156Steam Plants - QMED
70% to passUnder what circumstances would a propulsion steam turbine turning (jacking) gear most likely be used?
AWarming-through the main turbines prior to maneuvering.
BWhile applying a reverse thrust for stopping the shaft.
CWhile undergoing astern operations.
DFor additional power while underway.
AI Explanation
The correct answer is A) Warming-through the main turbines prior to maneuvering. The propulsion steam turbine turning (jacking) gear is used to slowly rotate the main turbines before starting the engine to gradually warm up the turbine components. This is a critical step to prevent thermal shock and potential damage to the turbine blades and other parts. The jacking gear is not used for reverse thrust, astern operations, or additional power while underway, which makes options B, C, and D incorrect.
Related Questions
Q78:Which of the labeled items within the illustrated steam drum represents the mean... Q181:If the boiler water and condenser hotwell levels are normal, but the DC heater l... Q85:What type of bearing is shown in the illustration? Illustration SE-0017 Q74:According to the illustrated diagram, what statement is true concerning the oper... Q118:In a cross-compounded turbine propulsion plant, steam enters the _______________...
Ready to test your knowledge?
Take a Steam Plants - QMED Practice ExamOfficial Resources