Question 146Steam Plants - Assistant Engineer70% to pass
A pneumatic dual element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes _______________.
AI Explanation
The correct answer is C) proportional plus reset action.
A pneumatic dual element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes proportional plus reset action. This control system combines proportional action, which provides a response proportional to the error, with reset action, which eliminates steady-state error over time. This combination of control actions allows for precise regulation of the boiler feed water level, ensuring stable and efficient operation of the main propulsion boiler.
The other options are incorrect because: A) two-position differential action only provides on/off control without the proportional and reset features, B) on off reset action lacks the proportional component, and D) proportional action alone cannot eliminate steady-state error like the proportional plus reset action can.
Related Questions
#144 The two-element feed water regulator functions similarly to the three-element feed water regulator, but does not utilize _______________.#145 Which type of feed water regulator listed provides the MOST effective regulation of boiler water level under all operating conditions? #147 A single element boiler feed water regulating system used aboard ship utilizes _______________.#148 A major difference between the two element and the three element feed water regulator control systems is that a three element system will additionally measure and incorporate the _______________.#149 The purpose of the cam-actuated steam valve used in a boiler soot blower system is to _______________.