Practice test 3

Every physical process of weather is accompanied by, or is the result of, a ​ (a)  

• Pressure differential

• Movement of air
• Heat exchange

What causes variations in altimeter settings between weather reporting points?

• Unequal heating of the Earth’s surface

• Variation of terrain elevation

• Coriolis force

The development of thermals depends on .​ (a)  

• Temperature inversions

• Solar heating
• A counter-clockwise circulation of air

Over which area should a Remote Pilot expect to find the highest amount of thermal currents under normal circumstances?

• 2

• 7

• 5

How would high density altitude affect the performance of a small, unmanned aircraft?

• No change in performance

• Increased performance

• Decreased performance

If the outside air temperature at a given altitude is warmer than standard, the density altitude is ____.

• Equal to pressure altitude

• Lower than pressure altitude

• Higher than pressure altitude

What are the standard temperature and pressure values for sea level?

• 15°C and 29.92 inches of mercury

• 59°C and 1013.2 millibars

• 59°F and 29.92 millibars

Which factor would tend to increase the density altitude at a given airport referenced in the weather briefing?

• An increase in barometric pressure

• An increase in ambient temperature

• A decrease in relative humidity

What effect does high density altitude have on the efficiency of a UA propeller?

• Propeller efficiency is increased

• Propeller efficiency is decreased

• Density altitude does not affect propeller efficiency

What effect does humidity have on performance?

• It has no effect on performance

• It increases performance

• It decreases performance