🔍 Key Concepts

• Common pressure measuring devices in marine engineering systems • How a Bourdon tube, diaphragm, and bimetallic element each respond to changes in pressure or temperature • Typical engine-room pressure gauges used on boilers, lube oil, fuel oil, and hydraulics

💭 Think About

• Ask yourself: Which of these device types actually bends or flexes directly due to pressure inside a curved tube and is widely used in round dial gauges? • Which options are primarily used for temperature measurement rather than pressure? • When you picture the standard round gauge on a boiler or pump discharge, what internal mechanism does that usually use?

✅ Before You Answer

• Identify which choices are mainly temperature-sensing devices and set those aside • Recall what kind of gauge is most often seen on boiler pressure, compressed air systems, and hydraulic lines • Make sure the device you select is known as the standard mechanical pressure gauge in most industrial and marine applications