Question id 506 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Used for large surfaces only.
Used as de-icing devices for pitot-tubes, static ports and windshield.
Used as anti-icing devices for pitot-tubes, static ports and windshield.
Used primarily because they are very efficient.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license