C03 - Atmospheric Pressure

Question 1

What type of Atmospheric Pressure is found in bad weather?

Answer 1

Low Air Pressure.

Question 2

What type of Atmospheric Pressure is found in good weather?

Answer 2

High Air Pressure.

Question 3

Falling Air Pressure is associated with what type of weather?

Answer 3

Approaching bad weather.

Question 4

Rising Air Pressure is associated with what type of weather

Answer 4

Approaching good weather.

Question 5

At low levels, what type of pressure is commonly found?

Answer 5

High Pressure.

Question 6

At high levels, what type of pressure is commonly found?

Answer 6

Low Pressure.

Question 7

The pressure caused solely by the effect of gravity on a mass of air is called what?

Answer 7

Static Pressure.

Question 8

1 mbar is equal to how many hPa?

Answer 8

1 hPa.

Question 9

What is the formula for Pressure?

Answer 9

P = F ÷ A.

Question 10

Acceleration of Mass due to the Earth’s gravity is recorded as?

Answer 10

1g.

Question 11

Earth’s gravity is a ‘____’ force?

Answer 11

Constant.

Question 12

True or False. Air Mass variability causes Atmospheric Pressure variability?

Answer 12

True.

Question 13

The ‘____’ the mass of overlying air, the greater the Atmospheric Pressure?

Answer 13

Greater.

Question 14

The lower the mass of overlying air, the ‘____’ the Atmospheric Pressure?

Answer 14

Lower.

Question 15

The denser the air, the ‘____’ the pressure?

Answer 15

Higher.

Question 16

What is a Synoptic Chart?

Answer 16

A diagram of variations in surface pressure.

Question 17

What is the common datum used in a Synoptic Chart?

Answer 17

Mean Sea Level.

Question 18

Define QFF?

Answer 18

The Mean Sea Level Pressure of a reporting station corrected for Elevation.

Question 19

Define Pressure Gradient Force?

Answer 19

A force that tries to drive air from an area of High Pressure to an area of Low Pressure.

Question 20

The greater the pressure difference, the ‘____’ the Pressure Gradient Force?

Answer 20

Greater.

Question 21

What two attributes to a greater Pressure Gradient Force?

Answer 21

• Air moves faster.

- Stronger Wind.

Question 22

What is suggested when having Isobars closer together (2)?

Answer 22

• Stronger PGF.

- Stronger Winds

Question 23

What is suggested when having Isobars further away (2)?

Answer 23

• Weaker PGF.

- Weaker Winds.

Question 24

Strong PGF is known to be associated with which type of pressure?

Answer 24

Low.

Question 25

Weak PGF is known to be associated with which type of pressure?

Answer 25

High.

Question 26

When does the highest pressure occur during the day?

Answer 26

10:00hrs and 20:00hrs.

Question 27

When does the lowest pressure occur during the day?

Answer 27

04:00hrs and 16:00hrs.

Question 28

Pressure decreases with Height at a ‘____’ rate?

Answer 28

Decreasing.

Question 29

What is the Pressure Lapse Rate formula and its values of measurement (3)?

Answer 29

- (96 x T°) ÷ P. - T = Temperature in Kelvin. - P = Pressure in hPa.

Question 30

According to ISA conditions what is the Pressure Lapse Rate?

Answer 30

27 feet per 1 hPa.

Question 31

Define QFE?

Answer 31

Atmospheric Pressure at an aerodrome reference point.

Question 32

An Altimeter set to QFE will read ‘____’ at the aerodrome?

Answer 32

0ft.

Question 33

When airborne, an Altimeter set to QFE will read ‘____’?

Answer 33

Height above the aerodrome reference point.

Question 34

Define QNH?

Answer 34

Atmospheric Pressure which has been mathematically adjusted down to Mean Sea Level.

Question 35

Define SPS?

Answer 35

Standard Pressure Setting is the Mean Sea Level pressure of 1013.25 hPa.

Question 36

When will Aircrafts use Standard Pressure Setting and why?

Answer 36

To have a common datum when not flying close proximity to terrain/ground.

Question 37

Height using Standard Pressure Setting are known as ‘____’?

Answer 37

Flight Levels.

Question 38

What is 27,500ft in Flight Level?

Answer 38

FL 275.

Question 39

What is 7,000 in Flight Level?

Answer 39

FL 070.

Question 40

Define QFF?

Answer 40

Similar to QNH but uses the actual pressure change and temperature, rather than ISA conditions.

Question 41

For airfields above sea level, in warm air QFF is ‘____’ than QNH?

Answer 41

Lower.

Question 42

For airfields above sea level, in cold air QFF is ‘____’ than QNH?

Answer 42

Higher.

Question 43

For airfields below sea level, in warm air QFF is ‘____’ than QNH?

Answer 43

Higher.

Question 44

For airfields below sea level, in cold air QFF is ‘____’ than QNH?

Answer 44

Lower.

Question 45

What is the Temperature and Pressure at 0ft (2)?

Answer 45

- +15°C. | - 1013.25 hPa.

Question 46

What is the Temperature and Pressure at 4,700ft / 1.5km (2)?

Answer 46

- +5.5°C. | - 850 hPa.

Question 47

What is the Temperature and Pressure at 9,800ft / 3km (2)?

Answer 47

- -4.6°C. | - 700 hPa.

Question 48

What is the Temperature and Pressure at 18,000ft / 5.5km (2)?

Answer 48

- -21.2°C. | - 500 hPa.

Question 49

What is the Temperature and Pressure at 30,000ft / 9.15km (2)?

Answer 49

- -44.4°C. | - 300 hPa.

Question 50

What is the Temperature and Pressure at 38,600ft / 11.75km (2)?

Answer 50

- -56.5°C. | - 200 hPa.