With regard to pneumatic mechanical devices which afford protection against the formation of ice, which of the following statements is correct? Question 23 options: The pneumatic mechanical device is used on modern jet aircraft as it is inexpensive and easy to maintain. The pneumatic mechanical device can only be used as an anti-icing device. The pneumatic mechanical device can only be used as a de-icing device. The inflatable de-ice boots of the pneumatic mechanical device are arranged perpendicular and located on the trailing edges.

the answer is The pneumatic mechanical device can only be used as a de-icing device.

Explanation:

An ice protection system prevents the formation of ice, or enables the aircraft to shed the ice before it can grow to a dangerous thickness. Ice protection systems are designed to keep atmospheric ice from accumulating on aircraft surfaces such as wings, propellers and engine intakes.

The pneumatic mechanical device is the Pneumatic deicing boots which was invented by the Goodrich Corporation in 1923. The pneumatic boot is usually made of layers of rubber, with one or more air chambers between the layers.

Any design which utilizes either a mechanical means of breaking the bond of ice to the surface, or which operates on a periodic cycle, is necessarily a de-ice system.

temp rises, and expansion

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it