Question 349Steam Plants - 1st Asst/Chief70% to pass
Before placing the jacking gear in operation on a main turbine unit, you must always insure that _______________.
AI Explanation
The correct answer is B) the main lube oil system is operating.
Before placing the jacking gear in operation on a main turbine unit, you must ensure that the main lube oil system is operating properly. This is because the jacking gear is used to rotate the turbine shaft when the main unit is not running, and the lube oil system is essential for providing lubrication to the turbine bearings during this operation. Failure to have the lube oil system functioning could result in damage to the turbine bearings and other components.
The other options (A, C, and D) are not directly related to the safe operation of the jacking gear and do not need to be confirmed before its use.
Related Questions
#347 With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to _______________.#348 Prior to rolling the main turbines in preparation for getting underway, you should _______________.#350 To stop the rotor of a main turbine while underway at sea you should _______________.#351 When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the _______________.#352 In the illustration, the function generators will accept only a signal of a given polarity and the amplifier "M" inverts the polarity of the signal. If negative is used for the ahead and positive for the astern reference potentiometers, moving the bridge reference potentiometer in the direction indicated will have what effect while the system is operating in the mode selected for in the illustration? Illustration SE-0002