Bellows Element Operation Quiz

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What is the equivalent of 15 000 feet in flight levels?

FL180

FL150 (correct)

FL120

FL200

What is indicated by an airspeed indicator?

The aircraft's altitude

The aircraft's ground speed

The aircraft's direction

The difference between dynamic and static pressure (correct)

Why is airspeed important for a pilot to maintain control of the aircraft?

To avoid stalling or structural damage (correct)

To avoid navigation errors

To calculate estimated time of arrival

To follow a specific route

What happens to dynamic pressure when an aircraft moves through the air?

It increases Signup and view all the answers

What is the unit of measurement for indicated airspeed?

Knots (nautical miles per hour) Signup and view all the answers

What is not a function of an airspeed indicator?

To calculate estimated time of arrival Signup and view all the answers

What is the function of the metering unit in a vertical speed indicator?

To vent static pressure to the interior of the case through a calibrated leak Signup and view all the answers

What happens to the pressure inside the capsule during a climb?

It decreases to a value less than that inside the instrument case Signup and view all the answers

What is the role of the rocking shaft and sector gear in a vertical speed indicator?

To rotate the pinion and pointer assembly Signup and view all the answers

What is the purpose of the capillary tube in a vertical speed indicator?

To supply static pressure to the inside of the capsule Signup and view all the answers

What is the position of the pointer on the dial during straight and level flight?

At the 0 feet per minute position Signup and view all the answers

What is the purpose of the leak tight case in a vertical speed indicator?

To house the mechanism and protect it from external influences Signup and view all the answers

What principle is the bellows type of element an extension of?

Corrugated diaphragm principle Signup and view all the answers

What is the purpose of employing a spring in some bellows applications?

To increase the spring-rate and assist the bellows in returning to its natural length Signup and view all the answers

What type of pressure can a bellows be used to measure?

High, low, or differential pressure Signup and view all the answers

What is the arrangement of the two bellows in a differential bellows assembly?

Push-pull arrangement Signup and view all the answers

What is the resulting pressure expression in a Sylphon type of bellows?

Absolute pressure or psia Signup and view all the answers

What is the reference point for differential pressure?

Vacuum Signup and view all the answers

How are bimetallic temperature sensors commonly used?

To compensate for temperature changes in various instruments Signup and view all the answers

What function do bimetallic strips and discs play in circuit breakers and fire detectors?

Operate switch contacts Signup and view all the answers

How does the elasticity of the capsule material in an altimeter change with variations in ambient temperature?

It increases Signup and view all the answers

In an altimeter, what occurs when the temperature decreases at sea-level?

The altimeter over-reads Signup and view all the answers

What happens to the U-shaped bracket in an altimeter when the temperature drops?

The limbs bend inwards Signup and view all the answers

How does a decrease in temperature affect error correction in the altimeter assembly?

Exerts a downward force on the capsule assembly Signup and view all the answers

What is the primary reason for fitting pitot static probe covers with a high visibility trailing warning flag while the aircraft is on the ground?

All of the above Signup and view all the answers

Why is probe alignment critical in pitot static systems?

Because it affects the accuracy of the probe Signup and view all the answers

What is the consequence of not fitting pitot static probe covers while the aircraft is on the ground?