02 Pressure Sensing

Question 1

What is the equation for pressure?

Answer 1

Pressure = Force (N) / Area (m^2)

Question 2

What does 1 bar equal in,

• mb
• hpa
• pa
• psi

Answer 2

1 bar = 1,000mb = 1,000hpa = 100,000pa = 15 psi

Question 3

What is ISA mean sea level pressure in:

• hPa
• mb
• inHg
• Psi

Answer 3

• 1013.25 hPa
• 1000 mb
• 29.92 inHg
• 15 Psi

Question 4

Describe Gauge Pressure

Answer 4

Gauge Pressure is the differential pressure relative to the ambient pressure

Question 5

Describe Absolute Pressure

Answer 5

Absolute Pressure is the differential pressure relative to a perfect vacuum

Question 6

Describe Differential Pressure

Answer 6

Differential Pressure is the pressure compared between two places

Question 7

What does MEMS technology stand for?

Answer 7

Micro-Electro-Mechanical Technology

Question 8

What does MAP Gauge stand for and where is it found?

Answer 8

• Manifold Absolute Pressure Gauge
• On the Inlet Manifold
• Between the Inlet Valve and the Throttle Valve

Question 9

Why are capsules multi-layered?

Answer 9

To amplify the movement

Question 10

Give the definition of Hysteresis

Answer 10

• A resistance to movement in a material

- Causes lag

Question 11

What are the errors associated with measuring pressure?

Answer 11

• Instrument
• Manoeuvre
• Position

Question 12

Concerning a Pitot and Static system, what causes Static Pressure error?

Answer 12

Disturbed air flow around the Static Ports

Question 13

What does a Bourdon Tube measure?

Answer 13

Bourdon Tube measures pressure

Question 14

An AC always takes off at constant?

Answer 14

EAS