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.
Related Questions
Q131:A hydraulic fluid flow control circuit, controlling linear actuator speed during... Q283:You are the relieving the Chief Engineer of a general cargo vessel of more than ... Q336:Fire and emergency training has three major components: knowledge sessions, skil... Q123:If a hydraulic pump is producing a noisy whine when in operation, the cause may ... Q194:Which type of Marine Sanitation Device (MSD) is used solely for the storage of s...
Ready to test your knowledge?
Take a General Subjects - 1st Asst/Chief Practice ExamOfficial Resources