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.
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