Sample questions

UAS general knowledge

A free preview of real exam-style questions for this topic — each with the correct answer, an explanation, and the official source it is based on.

1. 01What is the maximum mass of a C0 class UAS?

   • ✓Less than 250 g. — Correct answer
   • ·Less than 900 g.
   • ·Less than 4 kg.
   • ·Less than 25 kg.

   C0 class is < 250 g (and max speed 19 m/s). It maps to A1 and is the only class allowed over individual uninvolved persons.

   Reg (EU) 2019/945 Annex Part 1 — C0 requirements↗

2. 02Which UAS class is NOT required to have Direct Remote ID?

   • ·C1.
   • ✓C0 (< 250 g). — Correct answer
   • ·C2.
   • ·C3.

   Direct Remote ID is mandatory for C1, C2, C3. C0 is exempt as the lowest-risk class.

   Reg (EU) 2019/945 Annex Parts 2–4 — Direct Remote ID requirement↗

3. 03How much energy (Wh) does a 4S 5000 mAh (≈ 14.8 V) Li-Po battery hold?

   • ·≈ 740 Wh.
   • ·≈ 5 Wh.
   • ✓≈ 74 Wh. — Correct answer
   • ·≈ 20 Wh.

   Wh = Ah × V = 5.0 × 14.8 ≈ 74 Wh. This matters for air travel: most airlines limit batteries above 100 Wh in baggage and forbid anything above 160 Wh.

   IATA Lithium Battery Guidance↗; battery safety

4. 04What is the maximum speed of a C0 class UAS?

   • ·10 m/s.
   • ·30 m/s.
   • ·50 m/s.
   • ✓19 m/s. — Correct answer

   C0 class safety requirements include a 19 m/s (≈68 km/h) cap to limit impact energy if the drone strikes a person.

   Reg (EU) 2019/945 Annex Part 1 — C0(2)↗

5. 05Which class does an unmarked legacy drone < 250 g map to?

   • ✓A1 as the C0 equivalent. — Correct answer
   • ·A2 as the C2 equivalent.
   • ·A3 as the C3 equivalent.
   • ·The drone is not allowed at all without a class marking.

   Transitional rules map unmarked legacy drones by mass: < 250 g flies as C0 (A1), < 25 kg as C3 (A3).

   Reg (EU) 2019/947 Art. 22 — transitional provisions↗

6. 06A C2 class drone operates in A2 with active low-speed mode (≤3 m/s). What is the minimum horizontal distance from uninvolved persons?

   • ·30 m.
   • ✓5 m. — Correct answer
   • ·10 m.
   • ·No distance requirement in A2 low-speed mode.

   C2 drones in A2 have two distance requirements depending on speed: at normal speed — 30 m from uninvolved persons; in low-speed mode (≤3 m/s) — 5 m from uninvolved persons. Low-speed mode is a hardware certification, not just a speed limit — it is specified in the C2 class specification.

   Reg (EU) 2019/947 UAS.OPEN.030(2)(b) — A2 distance in low-speed mode↗