Previous Year Question
With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements:
I. All types of UAVs can do vertical landing.
II. All types of UAVs can do automated hovering.
III. All types of UAVs can use battery only as a source of power supply.
How many of the statements given above are correct?
Only one
Only two
All the three
None
Correct Answer: D
Detailed Solution
All three statements are incorrect.
Statement I is incorrect. All UAVs cannot perform vertical landing. Multirotor UAVs and specialized VTOL aircraft can perform vertical landing, but conventional fixed-wing UAVs may require a runway, landing strip, parachute, net-recovery or another recovery system.
Statement II is incorrect. Automated hovering is mainly a capability of multirotor, helicopter and certain VTOL UAVs. A conventional fixed-wing UAV must keep moving forward to maintain aerodynamic lift; therefore, all UAVs cannot hover.
Statement III is incorrect. The power supply of UAVs is not limited to batteries. Depending on their size, endurance and mission, UAVs may use battery-electric motors, internal-combustion engines, aviation fuel, fuel cells, solar power and hybrid propulsion systems.