Question 370General Subjects - Assistant Engineer

70% to pass

The output volume of a positive fixed displacement pump can be changed only by _______________.

Amoving the slide block and rotor
Bchanging the angle of the tilting plate
Cmoving the shaft trunnion block
Dchanging the speed of the pump
AI Explanation

The correct answer is D) changing the speed of the pump. The output volume of a positive fixed displacement pump can only be changed by varying the speed of the pump. This is because in a fixed displacement pump, the volume displaced per rotation is constant and cannot be changed. The only way to adjust the output volume is to change the rotational speed of the pump, which directly affects the volumetric flow rate. The other answer choices are incorrect because they do not apply to a fixed displacement pump. Moving the slide block and rotor, changing the angle of the tilting plate, or moving the shaft trunnion block are methods used to adjust the displacement in variable displacement pumps, not fixed displacement pumps.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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