2. Aviation Altitude and Pressure Quiz

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Questions and Answers

What unit is commonly used to measure wind speed by public weather services?

Miles per hour (mph)

Kilometres per hour (km/h) (correct)

Feet per minute

Knots

How is cloud amount indicated in aviation meteorology?

By the number of decimal points shown

Through the acronym HALO

By using Roman numerals

By the number of octas covered by a cloud (correct)

What is the equivalent of 1 Hectopascal in pressure measurement?

1 Pascal

1 Bar

1 Millibar (correct)

1 Torr

In which country is Inches of mercury (inHg) commonly used for pressure indication?

United States Signup and view all the answers

What does QFE stand for in aviation meteorology?

Pressure at the airfield elevation Signup and view all the answers

What does QNH represent in aviation meteorology?

Altimeter setting to make it read altitude above mean sea level Signup and view all the answers

What is the main concern regarding aircraft altimeter settings in aviation?

Variations in pressure references affecting altitude indications Signup and view all the answers

Why is wake turbulence especially dangerous close to the ground?

Aircraft have limited maneuvering speed at low altitude Signup and view all the answers

Which atmospheric condition can lead to ice accretion on aircraft structures?

Atmospheric icing conditions Signup and view all the answers

What is the main factor governing the strength of wake turbulence vortex?

Weight, speed, and shape of the generating aircraft's wing Signup and view all the answers

Which weather hazard presents the greatest risk to VFR pilots according to the text?

Reduced visibility and low cloud base Signup and view all the answers

In aviation, what does QNH primarily refer to?

Atmospheric pressure at sea level Signup and view all the answers

What is the definition of Flight Level in aviation?

The pressure altitude with the altimeter set to standard setting (1013) divided by 100 Signup and view all the answers

What is the International Standard Atmosphere (ISA) used for?

To simplify the atmosphere which varies and constantly changes Signup and view all the answers

What is the definition of Transition Altitude (TA) in aviation?

The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (QNH) Signup and view all the answers

What is the meaning of QNH in aviation?

The altimeter setting that will cause the altimeter to read altitude above mean sea level Signup and view all the answers

What is the definition of wind shear in aviation?

A difference in wind speed and direction over a relatively short distance Signup and view all the answers

What is the definition of turbulence in aviation?

A micro scale meteorological phenomenon occurring over a very small distance Signup and view all the answers

Study Notes

Wind Speed Measurement

Wind speed is typically measured in knots by public weather services.

Cloud Amount in Aviation Meteorology

Cloud amount is indicated using the oktas scale, which divides the sky into eight parts to quantify cloud cover.

Pressure Measurement

1 Hectopascal (hPa) is equivalent to 0.01 bar or approximately 0.02953 inches of mercury (inHg).

Use of Inches of Mercury

Inches of mercury (inHg) is commonly used for pressure indication in the United States.

QFE in Aviation Meteorology

QFE stands for "Query Field Elevation," indicating the air pressure at the aerodrome level.

QNH in Aviation Meteorology

QNH refers to the altimeter setting that adjusts for sea level pressure, allowing pilots to determine the departure and arrival altitudes.

Altimeter Settings Concern

The main concern regarding aircraft altimeter settings is ensuring accurate altitude readings to avoid terrain collisions.

Wake Turbulence Hazards

Wake turbulence poses a significant danger especially close to the ground due to reduced pilot reaction time and limited escape options.

Ice Accretion Conditions

Atmospheric conditions, such as supercooled liquid water, can lead to ice accretion on aircraft structures.

Wake Turbulence Vortex Strength

The strength of wake turbulence is primarily governed by the aircraft's weight; heavier aircraft produce stronger vortices.

Weather Hazard Risks

The greatest risk to VFR (Visual Flight Rules) pilots is typically presented by thunderstorms and associated turbulence.

QNH Definition in Aviation

In aviation, QNH primarily refers to the pressure setting that corresponds to mean sea level, essential for altitude measurement.

Flight Level Definition

Flight Level is defined as the altitude in hundreds of feet above the standard altimeter setting of 1013.25 hPa (29.92 inHg).

International Standard Atmosphere (ISA)

The ISA is a standardized model atmosphere used for calibrating instruments and determining aircraft performance.

Transition Altitude (TA) Definition

Transition Altitude (TA) is defined as the altitude at which aircraft switch from altimeter settings based on QNH to flight levels.

Meaning of QNH

QNH is used in aviation to provide pilots with air pressure data needed for accurate altitude readings during flight.

Wind Shear Definition

Wind shear refers to a sudden change in wind direction or speed over a short distance, which can affect aircraft performance during takeoff or landing.

Turbulence Definition

Turbulence in aviation is defined as irregular motion of the air, caused by various factors including wind shear and atmospheric instability, affecting the aircraft's flight stability.

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Description

Test your knowledge on altitude in aviation, including transition altitude, flight level, and pressure altitude. Understand the standard setting for altimeters and the International Standard Atmosphere (ISA).