FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What is the operating mechanism of most hydraulic pressure gauges?

A Diaphragm
A Piston
A Spring
A Bourdon Tube

The correct answer is: A Bourdon Tube

Most hydraulic pressure gauges utilize a Bourdon tube as their operating mechanism. A Bourdon tube is a specially shaped tube that tends to straighten when pressure is applied inside it. This straightening action causes the attached pointer to move, indicating the pressure being measured. Bourdon tubes are commonly used in pressure gauge applications due to their accuracy, reliability, and simplicity in design. Diaphragms, pistons, and springs are also used in various types of gauges and pressure control systems, but for hydraulic pressure gauges specifically, the Bourdon tube is the most common mechanism.