Instrument Sensing Elements and Pressure Measurements

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What happens to a bimetallic U bracket strip when there is an increase in ambient temperature?

It measures the ram pressure of the airstream
It is unaffected by pressure change and acts as a spring (correct)
It prevents icing in the pitot tube
It opposes capsule movement due to pressure change

What is the purpose of the static ports in a pitot static system?

To oppose capsule movement due to pressure change
To measure ram pressure of the airstream
To prevent icing in the pitot tube
To measure static pressure (correct)

Where are the static ports typically located on an aircraft?

At the front of the pitot tube
At the rear of the aircraft
On the wings
Along the sides of the fuselage (correct)

What is the function of the pitot tube in a pitot static system?

To measure ram pressure of the airstream (A) Signup and view all the answers

What is included in a pitot/static tube?

Static ports and electric heaters (C) Signup and view all the answers

What is the term for the system of ports and tubing on an aircraft that supplies pitot and static pressure for the instruments?

Pitot static system (D) Signup and view all the answers

What is the reason for temperature compensation in instruments?

To compensate for temperature changes affecting instrument readings (D) Signup and view all the answers

How does a manifold pressure gauge work?

It uses an evacuated bellows to reference measured pressure to a vacuum (C) Signup and view all the answers

What occurs when a bimetallic strip is heated?

It curls due to the difference in expansion of the two metals (C) Signup and view all the answers

Why is an aneroid capsule not suitable for use in cold climates?

It becomes less malleable and less responsive to pressure changes (B) Signup and view all the answers

What is psid an alternative term for?

Psig because the pressure measured is the difference between atmospheric and the pressure under test (B) Signup and view all the answers

What is the purpose of a bimetallic strip?

To compensate for temperature changes (D) Signup and view all the answers

What is the primary function of the bimetallic device inside the sensitive altimeter?

To provide automatic compensation for temperature changes (B) Signup and view all the answers

What is the range of measurement of the sensitive altimeter?

Between 35 000 to 50 000 feet or more (D) Signup and view all the answers

What is the function of the knob on the front of the altimeter?

To compensate for non-standard atmospheric pressure (C) Signup and view all the answers

How many equally spaced marks are on the dial face of the sensitive altimeter?

10 (D) Signup and view all the answers

What is the function of the 100-foot pointer?

It rotates once around the dial for each 100-foot change in altitude (A) Signup and view all the answers

How often does the 1000-foot pointer rotate once around the dial?

Every 10 000 feet (D) Signup and view all the answers

What is the first variable measured in a Machmeter?

Airspeed (C) Signup and view all the answers

What provides the altitude information in a Machmeter?

An aneroid capsule sensitive to static pressure (A) Signup and view all the answers

What is the function of the intermediate sliding rocking shaft?

To divide the altitude unit (A) Signup and view all the answers

How is the altimeter mechanism calibrated?

To QNE standards (D) Signup and view all the answers

What is the advantage of combining a Machmeter and airspeed indicator into one instrument?

Saved space on the panel (C) Signup and view all the answers

What is used to drive the indicator in a modern Mach Airspeed Indicator?

Pneumatic power and/or servomotors (D) Signup and view all the answers

What happens to the airspeed indicator when an aircraft descends with a partial blockage in the static line?

It will overread (B) Signup and view all the answers

What is the effect of a pitot tube blockage on the altimeter?

It has no effect (B) Signup and view all the answers

What happens to the airspeed indicator when an aircraft climbs with a partial blockage in the static line?

It will underread (D) Signup and view all the answers

What is the effect of a blocked pitot line on the airspeed indicator?

It shows no reading (B) Signup and view all the answers

What happens to the airspeed indicator when an aircraft accelerates with a blocked pitot line?

It fails to display (A) Signup and view all the answers

What is the benefit of selecting the 'alternate' static port in an aircraft with a partial blockage in the static line?

It bypasses the blockage (C) Signup and view all the answers