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Cabin Environment
There is an erroneous perception that the cabin environment of a pressurized aircraft is bad. That is not true. Treated by HEPA (High Efficiency Particulate Arrestance) filters – similar to those used in organ transplanting and burn
hospital units – the air in airplane cabins is climatized and
dehydrated, which makes the environment free from fungi and bacteria
and – because the air relative humidity becomes very low – even protects the existing airborne electronic equipment (avionics). The air flow is directed downwards, thus reducing the rate of contamination between seats. Additionally, all of the cabin air is replaced every three minutes. This will keep the oxygen ratesthroughout the aircraft at much higherlevels than those required by human consumption, and carbon dioxide and particulatematter at acceptable levels with respect to passenger safety, health and comfort.
(Adaptado de: TAM magazine, ano 3, nº 34, dez. 2006.)
1. According to the text:
a) Human beings need more oxygen when they are inside an aircraft.
b) The levels of carbon dioxide inside the cabin have to be reduced to avoid contamination between the seats.
c) The air that circulates inside a pressurized airplane cabin has very good quality.
d) Air filters used in airplane cabins are adapted from organ transplanting units.
e) The airflow circulates in all directions to assure all passengers get the same amount of air.
2. Consider the following sentences:
1. It is generally believed that the air that passengers breathe inside an airplane cabin is unhealthy.
2. Low humidity contributes to free the air from fungi and bacteria.
3. The treatment of the air inside a pressurized cabin helps to maintain avionics.
4. The levels of oxygen rates inside the aircraft tend to be unbearable when passengers leave the airplane.
According to the text:
a) Sentences 1, 2, 3 and 4 are correct.
b) Only sentences 1, 2 and 3 are correct.
c) Only sentences 2 and 4 are correct.
d) Only sentences 1, 2 and 4 are correct.
e) Only sentences 1, 3 and 4 are correct.
3. Consider the following information:
1. The level of oxygen rates required by human consumption.
2. The time it takes for air to be replaced inside an aircraft cabin.
3. The company that makes the filters used in aircrafts.
4. The direction of the airflow inside pressurized cabins.
Which sentences refer to consequences of using HEPA filters in aircraft cabins?
a) Only 1, 3 and 4 do.
b) Only 2, 4 and 5 do.
c) Only 1, 2 and 6 do.
d) Only 3, 5 and 6 do.
e) Only 1, 2, 4 and 5 do.
5. Which alternative can replace “thus” in the the sentence “The air flow is directed downwards, thus reducing the rate of contamination between seats” without changing the meaning?
4. The year when some ancient sewing needles were found.
What information is in the text?
a) Only 1 and 2 are.
b) Only 3 and 4 are.
c) Only 1, 3 and 4 are.
d) Only 2 and 4 are.
e) Only 1, 2 and 3 are.
2. Consider the following information:
1. The history of clothing from its beginning until recent years.
2. The reason it is difficult to know about earliest clothing.
3. The materials used in artifacts that made clothes deteriorate.
4. A place where archeologists found ancient sewing needles.
5. The different ways our ancestors used to put on their garments.
What information is in the text?
a) Only 1 and 3 are in the text.
b) Only 2 and 4 are in the text.
c) Only 1, 4 and 5 are in the text.
d) Only 2, 4 and 5 are in the text.
e) Only 1, 2 and 3 are in the text.
3. Which expression can replace the word “since” in the sentence “Knowledge of such clothing remains inferential, since clothing materials deteriorate quickly compared to stone, bone, shell and metal artifacts” without changing the meaning of the sentence?
