Aircraft Engine Pressure Systems

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Questions and Answers

Which instrument is NOT mentioned as using a diaphragm or bellows?

Temperature gauge (correct)

Altimeter

Manifold pressure gauge

Vertical speed indicator

What type of sensor changes its electrical resistance when a mechanical force is applied?

Crystalline piezoelectric sensor

Piezoresistor (correct)

Semiconductor chip sensor

Aneroid sensor

What is defined as the pressure compared to a total vacuum?

Differential pressure

Gauge pressure

Standard pressure

Absolute pressure (correct)

What is the most common type of pressure measurement?

Gauge pressure Signup and view all the answers

What is the standard pressure value established for atmospheric pressure in aviation?

29.92 inches of mercury ("Hg) Signup and view all the answers

What does the green arc on an oil pressure gauge indicate?

Normal operation Signup and view all the answers

What is the function of oil in reciprocating and turbine engines?

To lubricate and cool bearing surfaces Signup and view all the answers

In reciprocating engine aircraft, what does the manifold pressure gauge indicate?

The pressure of the air in the engine's induction manifold Signup and view all the answers

What does the Engine Pressure Ratio (EPR) gauge compare?

Exhaust pressure and air pressure at the intake Signup and view all the answers

Why is it undesirable to run a fuel line directly into the flight deck?

It could lead to a dangerous fire if a leak develops Signup and view all the answers

What do hydraulic systems commonly operate in aircraft?

Landing gear, flight controls, and brakes Signup and view all the answers

What do the red dial lines on an oil pressure gauge indicate?

Minimum and maximum safe operating limits Signup and view all the answers

How is the data transmitted to a digital EPR gauge?

Using a pressure ratio transmitter or a computer Signup and view all the answers

What is the primary role of a pressure switch in a hydraulic system?

To open or close an electric circuit based on pressure Signup and view all the answers

Which pressure-sensing mechanism is typically used for measuring high pressures?

Bourdon tube Signup and view all the answers

How is vacuum pressure mainly determined in aircraft instruments?

Through a suction gauge Signup and view all the answers

What type of materials are commonly used to manufacture Bourdon tubes?

Brass, bronze, or copper Signup and view all the answers

What is an essential requirement for gyroscopic flight instruments to function properly?

Adequate vacuum pressure to spin the gyros Signup and view all the answers

What characteristic differentiates diaphragm from Bourdon tube in pressure measurement?

Diaphragms are more suitable for low pressures. Signup and view all the answers

What does the vacuum pressure gauge measure?

The pressure difference between the internal system and the atmosphere Signup and view all the answers

Which of the following instruments would typically utilize a Bourdon tube for pressure measurement?

Oil pressure gauge Signup and view all the answers

Study Notes

Engine Oil Pressure

The most important instrument for assessing engine health.
Measured in pounds per square inch (PSI).
Green Arc indicates safe operating range.
Red Dial Lines indicate minimum and maximum safe operating limits.
Low or high oil pressure can lead to engine damage.

Manifold Pressure

Gauge used in reciprocating engine aircraft.
Indicates pressure of the air in the induction manifold.
Higher pressure indicates more power being developed by the engine.

Engine Pressure Ratio (EPR)

Gauge used in turbine engines.
Compares exhaust pressure with intake air pressure.
Provides an indication of engine thrust.

Fuel Pressure

Typically measured remotely using a transmitter device.
Prevents fuel line from running into the flight deck, reducing fire risk.

Hydraulic Pressure

Used in systems for operating landing gear, flight controls, brakes, etc.
Sufficient pressure is crucial for hydraulic system operation.

Vacuum Pressure

Measured using a gyro pressure gauge, vacuum gauge, or suction gauge.
Powers air-driven gyroscopic flight instruments.
Ensures gyros spin at the correct speed for accurate instrument readings.

Pressure Switches

Devices that open or close an electric circuit at a specific pressure.
Can be configured to open or close the circuit depending on the pressure.

Pressure Measurement Mechanisms

Bourdon Tube: Used for relatively high pressures, often made from brass, bronze, or copper alloys.
Examples: engine oil pressure gauge, hydraulic pressure gauge, oxygen tank pressure gauge, deice boot pressure gauge.
Diaphragm or Bellows: Used for relatively low pressures, often located inside direct reading gauges.
Examples: altimeter, vertical speed indicator, cabin differential pressure gauge, manifold pressure gauge.
Solid-State Sensing Devices: Used in modern aircraft to determine critical pressures.
Examples: crystalline piezoelectric sensor, piezoresistor, semiconductor chip sensors.

Types of Pressure

Absolute Pressure: Force compared to a total vacuum.
Gauge Pressure: Difference between measured pressure and atmospheric pressure.
Differential Pressure: Comparison of two pressures, measured using a differential pressure gauge.
Standard Pressure: Established value for atmospheric pressure:
- 29.92 inches of mercury (Hg)
- 1,013.2 hectopascal (hPa)
- 14.7 psi

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Description

Test your knowledge about various pressure gauges and their significance in aircraft engines. From oil pressure to hydraulic pressure, understand how these instruments contribute to engine health and performance. This quiz covers key concepts essential for aviation enthusiasts and professionals.