Question 1

Why is density altitude important for aircraft performance?

Accepted Answer

It allows us to determine aircraft performance under non-standard conditions.

Answer

It determines the airplane's weight.

Answer

It measures the humidity in the air.

Question 2

What does density altitude represent in practical terms?

Accepted Answer

The altitude the airplane thinks it's at.

Answer

The airplane's actual altitude.

Answer

The altitude of the airport.

Question 3

What is the standard temperature at sea level under ISA conditions?

Accepted Answer

15 degrees Celsius

Answer

20 degrees Celsius

Answer

10 degrees Celsius

Question 4

What is the standard pressure at sea level under ISA conditions?

Accepted Answer

29.92 inches of mercury

Answer

30.00 inches of mercury

Answer

28.50 inches of mercury

Question 5

How much does pressure decrease per thousand feet under ISA conditions?

Accepted Answer

1 inch of mercury

Answer

2 inches of mercury

Answer

0.5 inches of mercury

Question 6

What are the two main factors affecting air density?

Accepted Answer

Pressure and temperature

Answer

Temperature and humidity

Answer

Altitude and humidity

Question 7

How does high humidity affect aircraft performance?

Accepted Answer

It has a detrimental effect but is often ignored in performance charts.

Answer

It has no effect on aircraft performance.

Answer

It improves climb performance.

Question 8

What is the rule of thumb for takeoff distance in high humidity conditions?

Accepted Answer

Increase takeoff distance by 10%.

Answer

Increase takeoff distance by 5%.

Answer

Increase takeoff distance by 15%.

Question 9

What is pressure altitude?

Accepted Answer

The altitude indicated on your altimeter when set to 29.92 inches of mercury.

Answer

The altitude corrected for humidity.

Answer

The altitude corrected for temperature.

Question 10

How do you calculate pressure altitude?

Accepted Answer

Subtract the current altimeter setting from 29.92 and multiply by 1,000.

Answer

Add the current altimeter setting to 29.92 and multiply by 1,000.

Answer

Divide the current altimeter setting by 29.92 and multiply by 1,000.

Question 11

What two factors are needed to calculate density altitude?

Accepted Answer

Pressure altitude and ambient temperature

Answer

Pressure altitude and humidity

Answer

Altimeter setting and temperature

Question 12

How does thinner air affect density altitude?

Accepted Answer

Thinner air results in higher density altitude

Answer

Thinner air has no effect on density altitude

Answer

Thinner air results in lower density altitude

Question 13

At a pressure altitude of $$4,120$$ feet and a temperature of $$18$$ degrees Celsius, what is the density altitude?

Accepted Answer

5,412 feet

Answer

6,000 feet

Answer

4,000 feet

Question 14

What apps can be used to calculate density altitude?

Accepted Answer

FlightPlan Go and ForeFlight

Answer

Nav Canada and METAR Decoder

Answer

Google Maps and WeatherPro

Question 15

Where does Nav Canada include density altitude information in METAR reports?

Accepted Answer

In the remarks section

Answer

In the pressure section

Answer

In the temperature section

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