Week 1: Altitude and Pressure

Question 1

What is the lowest layer, the one in which we live in and in which most aircraft are flown?

Answer 1

Troposphere

Question 2

What is the height of the Troposphere at the EQUATOR?

Answer 2

+- 28000 ft

Question 3

Altitude affects what?

Answer 3

Air Density, pressure, and temperature

Question 4

How would you get your Altimeter to read 0?

Answer 4

Input the local barometric pressure of your location or turn the baro set knob till you get 0

Question 5

What are the 5 types of altitudes?

Answer 5

Indicated, True, Absolute, Pressure, Density

Question 6

This type of altitude is what’s read on the indicator, is uncorrected

Answer 6

Indicated Altitude

Question 7

What is the purpose of the Kollsman window?

Answer 7

Calibrate the instrument for atmospheric pressure at your altitude or set to 29.92

Question 8

What is TRUE altitude?

Answer 8

Your altitude above MSL with temperature compensation

Question 9

This type of altitude is the height AGL also known as the LRRA

Answer 9

Absolute altitude

Question 10

What is PRESSURE altitude?

Answer 10

Altitude above a standard datum plane set to 29.92inHg

Question 11

This type of altitude is a measure of air density in a given location at the current temperature and is important for aircraft performance

Answer 11

Density Altitude

Question 12

At what FL do we set our Altimeter to 29.92inHg?

Answer 12

FL180 (18000ft)

Question 13

As atmospheric pressure decreases, altitude _______

Answer 13

increases

Question 14

How do you measure air pressure?

Answer 14

Using a barometer

Question 15

In an OPEN vessel, if temp is heated up around a balloon (with air), what happens to the balloon?

Answer 15

The balloon will expand

Question 16

In a CLOSED vessel, if temperature is heated around a balloon, what happens to the balloon?

Answer 16

The balloon will contract

Question 17

What are the 2 types of barometers?

Answer 17

Liquid (mercury) and Aneroid (diaphragm)

Question 18

How does an Aneroid barometer work?

Answer 18

has a sealed aneroid cell that expands/contracts with changes in pressure

Question 19

As an aircraft goes up in altitude what happens in the altimeter?

Answer 19

The case will have decreased pressure and the diaphragm will expand

Question 20

Which type of barometer is more accurate?

Answer 20

Mercury barometer

Question 21

What are the 4 different types of AIR pressure?

Answer 21

Absolute, Gauge, Vacuum, Differential

Question 22

What is Gauge pressure?

Answer 22

the pressure relative to existing atmospheric pressure

Question 23

Give an example for positive and negative gauge pressure

Answer 23

Tire pressure is positive

Manifold pressure is negative

Question 24

Is gauge pressure in reference to a vaccuum?

Answer 24

No it is not

Question 25

This type of pressure is compared to atmospheric pressure using a sealed diaphragm or capsule

Answer 25

Vacuum Pressure

Question 26

What is DIFFERENTIAL pressure?

Answer 26

Difference of pressure between 2 points

Question 27

This pressure is measured relative to a full vacuum

Answer 27

Absolute pressure

Question 28

If pressure and density increases what happens to temperature?

Answer 28

Temperature decreases

Question 29

What is the lapse rate? a

Answer 29

Air temp. decreases 3.6F/1000ft all the way down to -56C at roughly 36000ft

Question 30

When will the lapse rate stop?

Answer 30

Lapse rate stops at the top of the troposphere

Question 31

What is a standard day?

Answer 31

59F or 15C, 14.7psi, 29.92inHg, 1013.25mbar at MSL