A pneumatic dual element, main propulsion,...

Question 1 / 205eccefa0bacbc34ba4d46e56

Question 1 of 205eccefa0bacbc34ba4d46e56

A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________.

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Question 1 of 20

5eccefa0bacbc34ba4d46e56

A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________.

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🔍 Key Concepts

• Pneumatic dual-element control systems and how they combine two different measured variables • Difference between proportional control, reset (integral) action, and simple on/off control • Why boiler feedwater regulation needs smooth correction of both level and steam flow, not just a binary response

💭 Think About

• Think about what happens in a main propulsion boiler if the water level drifts slowly off setpoint over time. Which control action is designed specifically to eliminate a steady, long-term offset? • Which type of controller would give smoother, more continuous valve movement: a simple on/off (two-position) controller, or one that adjusts the valve in proportion to the error and can also "wind up" to remove residual error? • In a dual-element system (typically steam flow and drum level), would a purely proportional system be enough to hold level tightly during long, steady steaming, or would something else be added to correct small persistent deviations?

✅ Before You Answer

• Identify which options involve continuous control (not simple on/off) suitable for main propulsion boiler feedwater valves. • Recall which control action is responsible for eliminating steady-state error in industrial control systems. • Eliminate any options that describe binary or two-position operation, which would tend to cause excessive cycling in boiler drum level.

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Question 1 of 20

A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________.

Proportional action

Proportional plus reset action

On off reset action

Two-position differential action

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Question 1 / 205eccefa0bacbc34ba4d46e56

Question 1 of 205eccefa0bacbc34ba4d46e56

A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________.

Back

Question 1 of 20

5eccefa0bacbc34ba4d46e56

A pneumatic dual element, main propulsion, boiler feedwater regulating system commonly used aboard ship utilizes __________.

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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

Quick actions

— No credit card needed