Weather - FAA Part 107 Drone Exam Prep

Question 1

Why is 'clear ice' generally considered the most dangerous type of structural icing?

Accepted Answer

Because it is heavy, hard to see, alters the shape of the airfoil, and is difficult to remove.

Answer

Because it only forms at extremely high altitudes out of drone range.

Answer

Because it creates an electromagnetic field that disrupts the drone's compass.

Question 2

What effect does a strong headwind have on a small UAS trying to fly from point A to point B?

Accepted Answer

It decreases the ground speed, meaning the drone will require more battery power and time to cover the same distance.

Answer

It increases the ground speed and reduces battery consumption.

Answer

It has no effect on ground speed, only on indicated airspeed.

Question 3

Thunderstorms require three elements to form: high moisture, an unstable lapse rate (instability), and:

Accepted Answer

A lifting force (such as heating from below or a frontal boundary).

Answer

High barometric pressure.

Answer

A strong temperature inversion.

Question 4

When does Density Altitude equal Pressure Altitude?

Accepted Answer

When the temperature is standard (15 °C at sea level).

Answer

When flying at exactly mean sea level.

Answer

When the humidity is 0%.

Question 5

Sea breezes are caused by:

Accepted Answer

The fact that land heats faster than water during the day, causing air to rise over the land and cooler air from the water to flow in.

Answer

The rotation of the Earth pulling ocean currents inland.

Answer

The fact that water heats faster than land during the day.

Question 6

A temperature inversion would most likely result in which weather condition?

Accepted Answer

An increase in temperature as altitude is increased.

Answer

Clouds with extensive vertical development above an inversion aloft.

Answer

Good visibility in the lower levels of the atmosphere and poor visibility above an inversion aloft.

Question 7

Low-level turbulence can occur and icing can become hazardous in which type of fog?

Accepted Answer

Steam fog.

Answer

Upslope fog.

Answer

Rain-induced fog.

Question 8

What effect does haze have on the ability to see traffic or terrain features during flight?

Accepted Answer

All traffic or terrain features appear to be farther away than their actual distance.

Answer

Haze causes the eyes to focus at infinity.

Answer

The eyes tend to overwork in haze and do not detect relative movement easily.

Question 9

In a TAF, a 'TEMPO' group indicates temporary fluctuations in weather. How long do these fluctuations usually last?

Accepted Answer

Usually less than an hour, and in total less than half the time period specified.

Answer

Exactly two hours.

Answer

More than half of the entire forecast period.

Question 10

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

Accepted Answer

An increase in ambient temperature.

Answer

An increase in barometric pressure.

Answer

A decrease in relative humidity.

Exam questions Weather - FAA Part 107 Drone Exam Prep