Meteorology - EASA Drone License A2

Question 1

Why is 'Rime Ice' considered highly dangerous to aircraft aerodynamics?

Accepted Answer

It is rough and milky, altering the aerodynamic shape of the airfoil rapidly, destroying lift and increasing drag

Answer

It dissolves the plastic of the drone

Answer

It burns the motors

Answer

It is completely invisible, making it impossible to detect

Question 2

If you leave your drone outside on a cold morning and a thin layer of frost forms on the propellers, what must you do before flying?

Accepted Answer

Thoroughly clean and dry the propellers before flight; even a thin layer of frost disrupts the airfoil's smooth surface, drastically reducing lift and increasing drag

Answer

Fly immediately so the spinning action shakes the frost off

Answer

Turn the motors on full throttle while holding the drone down

Answer

Ignore it; frost is too thin to affect a drone

Question 3

How does ice accumulation directly affect a drone's propellers?

Accepted Answer

It alters the airfoil shape, drastically reducing lift and increasing drag, while uneven ice shedding causes severe, potentially destructive vibrations

Answer

It improves the propeller's aerodynamic efficiency by smoothing scratches

Answer

It keeps the motors cool, allowing for faster flight

Answer

It has no effect unless the ice is more than 5cm thick

Question 4

What is a 'Jet Stream'?

Accepted Answer

A narrow band of very strong, high-altitude winds (often exceeding 100 knots) flowing generally from west to east near the tropopause

Answer

The exhaust trail left by a jet engine

Answer

A warm ocean current flowing from the tropics

Answer

A sudden burst of wind near a mountain valley

Question 5

In aviation meteorology, what does 'SIGMET' stand for?

Accepted Answer

Significant Meteorological Information; an advisory concerning potentially hazardous weather phenomena like severe turbulence, icing, or volcanic ash

Answer

Signal Meteorological Tool

Answer

Significant Moisture Evaluation Testing

Answer

Standard Instrument Ground Meteorological Evaluation

Question 6

In a METAR report, what does the cloud abbreviation 'TCU' stand for?

Accepted Answer

Towering Cumulus; a cloud of significant vertical development that often precedes a cumulonimbus (CB) and indicates strong updrafts

Answer

Thick Cloud Underlayer

Answer

Total Cloud Umbrella

Answer

Thin Cirrus Uplift

Question 7

Why is the anvil (topmost part) of a cumulonimbus cloud dangerous, even if you are miles away from the storm's centre?

Accepted Answer

Strong upper-level winds can carry severe hail out of the anvil, causing it to fall miles ahead of the main storm and potentially destroying a drone in clear air

Answer

It blocks the sun, making it too dark to fly

Answer

It creates a vacuum that pulls the drone upwards

Answer

It emits a high-frequency noise that disrupts the radio controller

Question 8

If a METAR reports 'R27/1200U', what does this indicate?

Accepted Answer

The Runway Visual Range (RVR) for Runway 27 is 1,200 metres, and the visibility is trending Upward (improving)

Answer

There is a rainstorm (R) at 27 degrees, moving at 1,200 metres per hour

Answer

The wind is rotating 27 degrees every 1,200 seconds

Answer

Radar detects a storm 27 miles away at 1,200 feet

Question 9

On the Beaufort scale, a Force 5 wind (Fresh Breeze, roughly 17-21 knots) is generally characterized on land by:

Accepted Answer

Small trees in leaf beginning to sway; crested wavelets forming on inland waters. This is often the operational limit for many commercial drones.

Answer

Smoke rising vertically

Answer

Trees being uprooted and structural damage occurring

Answer

Only leaves rustling gently

Question 10

An anemometer is an instrument used to measure:

Accepted Answer

Wind speed

Answer

Atmospheric pressure

Answer

Relative humidity

Answer

The altitude of the cloud base

Exam questions Meteorology - EASA Drone License A2

EASA Drone License A2: Meteorology 10 Questions no time limit

Exam questions Meteorology - EASA Drone License A2

EASA Drone License A2: Meteorology 10 Questions no time limit

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