Question 168General Subjects - 1st Asst/Chief
70% to passOf the following propulsion modes, which one would operate with a geared-drive featuring a double reduction?
ASlow speed diesel
BMedium speed diesel
CHigh speed diesel
DGas turbine
AI Explanation
The correct answer is D) Gas turbine. Gas turbine propulsion systems for ships typically operate at high speeds, requiring a geared-drive system with a double reduction gear to match the lower operating speeds of the propeller. This allows the gas turbine to operate at its optimal high-speed range while reducing the speed to a suitable level for the propeller. In contrast, slow speed diesel, medium speed diesel, and high speed diesel engines do not typically require a double reduction gear, as their operating speeds are already better suited for direct coupling to the propeller.
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