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HD Quiz powered by harmonic design
#1. Consider the following statements relative to Air Density and select the one which is correct:
DENSITY IS DIRECTLY PROPORTIONAL TO PRESSURE
anticylone is high pressure system
hence density altitude will increase with high pressure
#2. The tropopause in mid latitudes is:
Along the surface of the earth density will be higher at the poles than at the equator. This is because the surface pressure at the poles is relatively higher than the equator and because the temperature is much colder than at the equator.
8 km above the earth surface reversal occurs density will be higher at the equator and lower at the polls hence tropopause are Lower in winter with a higher temperature.
#3. Generally as altitude increases:
as altitude increases according to the ISA conditions lapse rate is 2°C hence temperature decreases
As altitude increases, the effect of pressure decreasing causes density to fall despite the fact that temperature decreases
And as we all know
DENSITY IS DIRECTLY PROPORTIONAL TO PRESSURE
density also decreases
#4. In the troposphere:
molecules in cold air are closely packed
molecules in warm air are loosely packed
a column of cold air on the left, and a column of warm air on the right. Notice that, since cold air causes pressure to fall more rapidly with height, the pressure levels in the cold air column are compressed towards the Earth’s surface, whereas, in the warm air column, they expand away from the surface
#5. Density at the surface will be low when:
DENSITY IS INVERSELY PROPORTIONAL TO TEMPERATURE
Hence
temperature increases
density decreases
DENSITY IS DIRECTLY PROPORTIONAL TO PRESSURE
pressure decreases density decreases
#6. At FL 180, the air temperature is -35°C.The air density at this level is:
DENSITY IS DIRECTLY PROPORTIONAL TO PRESSURE
pressure is constant in this case
DENSITY IS INVERSELY PROPORTIONAL TO TEMPERATURE
Hence
temperature decreases density increases
#7. Under what condition does pressure altitude have the same value as density altitude?
Density altitude is pressure altitude corrected for nonstandard temperature
if temperature is standard
density altitude is equal to pressure altitude