Question 365Steam Plants - 1st Asst/Chief

The correct answer is C) high speed pinion rotor. The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the high speed pinion rotor. This allows the high speed pinion rotor to be rotated manually, which is necessary for maintenance and inspection procedures. The jacking/turning gear mechanism provides a means to slowly rotate the propulsion shafting and turbine components, rather than relying on the main propulsion system. The other answer choices are incorrect because the bull gear, low speed gear rotor, and low speed pinion rotor are not directly connected to the jacking/turning gear mechanism in a typical geared turbine installation. The high speed pinion rotor is the component that needs to be rotated manually, so the jacking/turning gear mechanism is connected to it.