Part 107 Unit 6 part 1 quiz

Which of the following considerations is more relevant to a Remote PIC when evaluating unmanned aircraft performance?

• Current weather conditions

• The number of available ground crew.

  
  

• The type of the sUAS operation.

  
  

Answer explanation

The current weather will dictate the performance of the aircraft. Density altitude is affected by temperature and pressure changes.

Which combination of atmospheric conditions will reduce aircraft takeoff and climb performance?

• High temperature, low relative humidity, and low density altitude.

• Low temperature, low relative humidity, and low density altitude.

• High temperature, high relative humidity, and high density altitude.

Answer explanation

Density altitude increases with an increase in temperature, a decrease in pressure, and/or an increase in humidity.

What effect, if any, does high humidity have on aircraft performance?

• It decreases performance

• It has no effect on performance.

  
  

• It increases performance.

  
  

Answer explanation

Humidity will have the same effect as low pressure or high temperature, aka it will increase the density altitude and affect performance negatively.

What effect does high density altitude, as compared to low density altitude, have on propeller efficiency and why?

• Efficiency is reduced due to the increased force of the propeller in the thinner air.

• Efficiency is increased due to less friction on the propeller blades.

  
  

• Efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes.

Answer explanation

Density Altitude is the altitude corrected for non-standard pressure and non-standard temperatures. A high density altitude means your UAS will "feel" like it's operating at a higher altitude, hence the performance will be diminished. In this case, it will reduce the efficiency of the propeller. See "Density Altitude" for more information.

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

• Propeller efficiency is decreased.

• Propeller efficiency is increased.

  
  

• Density altitude does not affect propeller efficiency.

Answer explanation

Density Altitude is the altitude corrected for non-standard pressure and non-standard temperatures. A high density altitude means your UAS will "feel" like it's operating at a higher altitude, hence the performance will be diminished. In this case, it will reduce the efficiency of the propeller. See "Density Altitude" for more information.

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

• 59°F and 29.92 millibars.

  
  

• 59°C and 1013.2 millibars.

  
  

• 15°C and 29.92" Hg

Answer explanation

Rote memory item: 15°C and 29.92 in Hg or 59°F and 1013.2 millibars.

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

• movement of air.

• pressure differential.

  
  

• heat exchange.

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

• Decreased performance.

• No change in performance.

  
  

• Increased performance.

  
  

Answer explanation

Density Altitude is the altitude corrected for non-standard pressure and non-standard temperatures. A high density altitude means your UAS will "feel" like it's operating at a higher altitude, hence the performance will be diminished. See "Density Altitude" for more information.

Which factor would tend to increase the density altitude at a given airport?

• A decrease in relative humidity.

  
  

• An increase in ambient temperature.

• An increase in barometric pressure.