An engine is equipped with the overspeed...

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Question 1 of 205eccefa1bacbc34ba4d4774a

An engine is equipped with the overspeed trip similar to that shown in the illustration. The throw out weight is designed to run at 900 RPM and trip out at 10% overspeed. However, the overspeed trip is currently activating at 930 RPM. In order to correct this problem, __________. Illustration MO-0101

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🔍 Key Concepts

• Centrifugal force acting on the throw-out weight versus resisting force of spring #12 • Relationship between set speed, overspeed percentage, and trip point RPM • How changing spring compression or weight size affects the RPM at which the trip will activate

💭 Think About

• Is the overspeed trip activating at a higher RPM than desired, or at a lower RPM than desired? What does that tell you about whether the mechanism is too sensitive or not sensitive enough? • If you want the trip to occur at a higher RPM, should the centrifugal force needed to move the weight be increased or decreased? Which adjustment would accomplish that? • Consider each option: which ones would increase centrifugal force at a given speed, and which would increase the resisting force holding the weight in? How would each shift the trip RPM?

✅ Before You Answer

• Compute the correct trip RPM for 10% overspeed on a 900 RPM setting and compare it to 930 RPM. • Decide whether the spring force needs to be stronger or weaker to delay tripping until the correct RPM. • Eliminate any options that would clearly cause the device to trip even earlier (at an even lower RPM).

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