1What is the average value of the temperature lapse rate in the region of the Earths atmosphere known as the troposphere
- 1.98’C per 500 feet
- 1.98’C per 1000 feet
- 2.20’C per 1000 feet
2The troposphere is a layer of the atmosphere where the temperature
- Generally decreases with an altitude increase
- Generally increases with an altitude increase
- Remains constant throughout until the ionosphere
3Millibars are units of
- Pressure which decrease in value with an increase in altitude
- Density which increase in value with a decrease in altitude
- Force which increase with an increase in dynamic pressure
4Atmospheric pressure at any point is equal to
- The square root of the weight of a column of air above that point, of one square inch in section, extending from that point
- The weight of a column of air above that point, of one square inch in section, extending from that point
- The square of the weight of a column of air above that point, of one square inch in section, extending from that point
5At the tropopause, air pressure is approximatel
6The point in the atmosphere where air temperature stops reducing with increasing altitude and becomes constant is known as
- Tempopause
- Tropopause
- Stratopause
7Moisture in the air has the effect of
- Reducing the density
- Increasing the density
- Reducing the pressure
8As the altitude increases, the viscosity of the air in the boundary layer will
- Decrease with a decrease in temperature up to the tropopause
- Increase with a decrease in temperature
- Remain relatively constant with the effects of pressure and density
9The ISA standard for air density is
- 1.225kg/m^3
- 1.425 kg/m^3
- 1.625 kg/m^3
10Assuming there is no change in temperature and pressure, the density of air
- Will vary with humidity so that air density is less on dry days
- Changes to a higher value on dry days
- Increases with a change in relative humidity on damp days
11If pressure and temperature are known, air density may be calculated by using
- The equation of continuity
- Bernoulli’s theorem
- The equation of state
12The composition of air in the atmosphere is approximately
- 78% oxygen, 21% nitrogen, 1% other gases
- 21% oxygen, 78% carbon dioxide, 1% other gases
- 78% nitrogen, 21% oxygen, 1% other gases
13With increasing altitude, the air will
- Move more freely as it becomes less dense
- Become more restricted in movement as the particles collide more frequently
- React to the change in pressure only, and therefore move in a more restricted space
14Aircraft normally operate in
- Troposphere and lower stratosphere
- Ionosphere and lower troposphere
- Stratosphere and lower ionosphere
15The International standard atmosphere specifies
- Air is dry
- A maximum relative humidity of less than 5%
- An average relative humidity of 70%
16Air has weight and is compressible. It’s
- Pressure and density increase with an increase in altitude
- Pressure, density and temperature all decrease with an increase in altitude
- Density and temperature increase with an increase in altitude
17The stratosphere lies
- Between the stratopause and tropopause
- Above the ionosphere but below the troposphere
- Above both the ionosphere and troposphere
18An aircraft flying at 10,000ft, compared to an aircraft of the same weight flying at the same IAS (Indicated Air Speed) but at sea level will have
- A larger angle of attack
- A smaller angle of attack
- The same angle of attack
19As altitude increases, the local speed of sound will
- Decrease
- Increase
- Remain unaltered
20To obtain accurate airspeed the
- Atmospheric density and humidity must be known
- Actual atmospheric temperature and pressure must be considered
- Calibrated airspeed and atmospheric density, must be known
21In order to calculate calibrated airspeed
- Pressure error corrections and instrument errors are combined with true airspeed
- Indicated airspeed is combined with pressure error and instrument error
- Rectified airspeed and pressure error are added to instrument error
22Equivalent airspeed is calculated by multiplying calibrated airspeed by the ratio of
- Ambient density to standard density
- Sea level density to standard density
- Sea level density to ambient density
23An indicated airspeed gauge must not have an error greater than
24The ratio of ambient density to standard density when multiplied by
- Calibrated airspeed is equal to equivalent airspeed
- Rectified airspeed is equal to indicated airspeed
- Equivalent airspeed is equal to true airspeed