POF Q1 - 01/02 Air, Atmosphere and Airspeed

Question 1

Which property of air is responsible for frictional forces between layers, and entrainment?

Select one:

a.Density

b.Viscosity

c.Speed

d.Temprature

Answer 1

b.Viscosity

Question 2

Static pressure can be said to…
Select one:

a.Decrease as you descend down through the atmosphere.

b.Remain unaffected as it has nothing to do with pressure.

c.Increase as you descend down through the atmosphere.

d.Not be felt equally on points of a surface.

Answer 2

c.Increase as you descend down through the atmosphere.

Question 3

The kinetic energy of moving air is expressed in which equation?
Select one:

a.1/2 ρ V

b.1/2 ρ V2

c.1/2 m V2

d.F= ma

Answer 3

b.1/2 ρ V2

Question 4

At 32,000 ft the air density drops to 0.325 kg/m3. At an airspeed of 340 knots, what is the dynamic pressure experienced by the aircraft?
Select one:

a.4,600 N/m3

b.4,971 N/m2

c.4,971 N/m3

d.4600 Newtons

Answer 4

b.4,971 N/m2

1/2 x 0.325 x (340 x 0.5144)² = 4971 N/m²

Question 5

Dynamic pressure can be said to vary with…
Select one:

a.TAS2

b.TAS

c.IAS2

d.IAS

Answer 5

c.IAS2

Question 6

With all other factors remaining constant, what will happen to dynamic pressure if density increases?
Select one:

a.Decrease

b.Increase

c.Remain unchanged

d.There is insufficient information to answer this question.

Answer 6

b.Increase

Question 7

The density of a parcel of air varies with which factors?
Select one:

a.Speed

b.The square of the pressure, density, and humidity.

c.Pressure, temperature, and humidity.

d.The square of the temperature

Answer 7

c.Pressure, temperature, and humidity.

Question 8

TAS can be said to be….
Select one:

a.IAS corrected for position errors.

b.CAS corrected for position error.

c.EAS corrected for compressibility errors.

d.EAS corrected for density errors.

Answer 8

d.EAS corrected for density errors.

Question 9

Calculate the EAS at 34,000ft. Your TAS is 464 knots. The air density is 0.478 kg/m3
Select one:

a.590 knots

b.290 knots

c.181 knots

d.302 m/s

Answer 9

b.290 knots

Question 10

The actual speed of the aircraft through the air is the?
Select one:

a.Ground speed (GS)

b.Calibrated airspeed (CAS)

c.True air speed (TAS)

d.Indicated airspeed (IAS)

Answer 10

c.True air speed (TAS)

Question 11

Match the correct SI Units

Energy

Pressure

Acceleration

Power

Density

Temperature

Velocity

Force

Weight

Mass

Answer 11

Energy → J (Joule),

Pressure → N/m2,

Acceleration → m/s2,

Power → W (watts),

Density → kg/m3,

Temperature → K (Kelvin),

Velocity → m/s,

Force → N (Newton),

Weight → N (Newton),

Mass → kg (kilogram)