The device shown in the illustration is used...

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Question 1 of 205eccefa1bacbc34ba4d47743

The device shown in the illustration is used to secure the air supply to a diesel engine when the engine overspeeds. In order for this to occur, supplied oil pressure must __________. Illustration MO-0103

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🔍 Key Concepts

• Overspeed air shutoff valve operation: which position is ‘normal running’ and which is ‘overspeed shutdown’? • Relationship between oil pressure and spring force in a fail‑safe actuator (what happens if you lose oil pressure?). • How piston rod travel (open → closed) is shown in the illustration, and how that motion rotates the butterfly valve.

💭 Think About

• First, decide which direction of piston rod motion (left or right) corresponds to the butterfly going to the closed position in the drawing. Trace the linkage carefully. • Then think about an engine overspeed: would you want the shutdown to depend on having oil pressure, or on losing oil pressure? Which is safer if the oil supply fails? • Ask yourself: in normal operation (engine running safely), is the valve likely held open by oil pressure or by the spring? Then, for overspeed, which one must ‘take over’ to move the valve toward closed?

✅ Before You Answer

• Verify on the sketch where “Open” and “Closed” are marked along the actuator travel, and what direction (left/right) that implies for the piston rod when it is closed. • Confirm which element actually drives the motion during shutdown: increasing oil pressure vs decreasing oil pressure allowing the spring/linkage to move. • Make sure the option you choose matches both: (1) the correct direction of piston rod motion for closing the valve, and (2) the correct change in oil pressure (increase or decrease) for a fail‑safe overspeed shutdown.

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