The main engines on your oil platform supply...

Study

Question 1 of 2066636eef28f7522a1c51fe35

The main engines on your oil platform supply vessel are fitted with speed control governors of the type shown in the illustration. If the shutdown solenoid is de-energized during normal operation, which of the following scenarios depicts the response on a safety shutdown where the shutdown plunger rod moves downward unseating the ball check valve when the shutdown solenoid energizes? Illustration MO-0170

Back

Question 1 of 20

66636eef28f7522a1c51fe35

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Operation of the shutdown solenoid, plunger rod, and ball check valve in the speed‑setting servo circuit • How opening the ball check valve changes oil pressure above/below the speed‑setting servo piston and which way the piston and its rod will move • Relationship between speed setting change and power piston / tailrod movement that reduces fuel to the main engines

💭 Think About

• With the solenoid ENERGIZED and the plunger rod moving DOWN to unseat the ball check valve, does oil escape from the speed‑setting servo cylinder or get trapped in it? Based on that, which side of the servo piston loses pressure and which way will the piston rod move? • When the governor is driven toward a full safety shutdown (zero fuel), does the power piston need to move in the direction marked "increase" or "decrease" on the illustration? How does that dictate the direction of tailrod travel? • Look at the mechanical linkage: if the speed‑setting servo piston rod moves up, does that increase or decrease speeder spring compression? How would the flyweights and pilot valve then make the power piston move?

✅ Before You Answer

• Verify on the illustration which way the fuel (or steam) increase/decrease arrows point relative to power piston and tailrod motion. • Confirm from the diagram which end of the speed‑setting servo spring is fixed and which end is attached to the piston rod; this tells you what piston movement does to speed setting. • Make sure the chosen option has servo piston motion that would clearly result in a reduction of fuel to zero through the governor action, consistent with a safety shutdown.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed