Question id 507 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Are usually used as de-icing devices.
Are usually used on aeroplanes equipped with turbo-fan engines.
Require large quantities of bleed air.
Can only be used as anti-icing devices.

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