Question 366Steam Plants - 1st Asst/Chief70% to pass
The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the _______________.
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.
Related Questions
#364 Water removed through centrifugal force in the illustrated unit is displaced from the bowl through _______________. Illustration GS-0124#365 The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the _______________.#367 Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion? #368 The jacking gear on main propulsion turbines can be used to _______________.#369 Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of _______________.