Question 350Steam Plants - 1st Asst/Chief70% to pass
To stop the rotor of a main turbine while underway at sea you should _______________.
AI Explanation
The correct answer is D) admit astern steam to the turbine after securing the ahead steam.
To stop the rotor of a main turbine while underway at sea, the proper procedure is to first secure all ahead steam to the turbine, and then admit astern steam to the turbine. This creates a reverse thrust that will slow down and eventually stop the turbine rotor.
The other options are incorrect because they do not directly address the process of stopping the turbine rotor. Applying a prony brake (A) or tightening the stern tube packing gland (B) would not effectively stop the turbine rotor. Securing all steam to the turbine (C) without admitting astern steam would also not stop the rotor, as the momentum would continue to keep it spinning.
Related Questions
#348 Prior to rolling the main turbines in preparation for getting underway, you should _______________.#349 Before placing the jacking gear in operation on a main turbine unit, you must always insure that _______________.#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 #353 Which of the statements listed applies to the quill shaft shown in the illustration? Illustration SE-0005