Question 366Steam Plants - 1st Asst/Chief

70% to pass

The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the _______________.

Agreatest gear ratio between the turning gear motor output and bull gear can be obtained
Bturning gears are double reduction worm type and cannot mate with the low pressure high- speed pinion
Clubricating oil from the high-speed pinion can easily supply the turning gears
Darrangement allows for the use of a muff type coupling for flexibility and smooth engagement
AI Explanation

The correct answer is A) The greatest gear ratio between the turning gear motor output and bull gear can be obtained. The main propulsion shaft turning gear is connected to the free end of the high-speed, high-pressure pinion because this arrangement allows for the greatest possible gear reduction ratio between the turning gear motor output and the large bull gear. This maximizes the torque output of the turning gear system, which is necessary to slowly rotate the heavy main propulsion shaft and attached components during maintenance or start-up procedures. The other answer choices are incorrect because they do not directly address the purpose of the turning gear configuration, which is to provide the necessary gear reduction and torque multiplication.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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