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84 Multiple Choice Antworten
The time for dark adaptation is
10 min
10 sec
1/10 sec
30 min
Which problem may occur, when flying in an environment of low contrast (fog, snow, darkness, haze)?
Under these conditions it is:
difficult to estimate the correct speed and size of approaching objects
impossible to detect objects
no problem to estimate the correct speed and size of approaching objects
improbable to get visual illusions
A pilot approaching an upslope runway
is performing a steeper than normal approach, landing long
may feel that he is higher than actual. This illusion may cause him to land short.
establishes a higher than normal approach speed
establishes a slower than normal approach speed with the risk of stalling out
The area in front of a threshold descends towards the threshold.
Possible danger is:
approach is lower than normal and may result in a short landing
to drop far below the glide path
approach is higher than normal and may result in a long landing
to misjudge the length of the runway
Sunglasses with variable filtration (phototrope glasses)
are advantageous for pilots
are generally forbidden for pilots
are ideal, as long as there are no polarisation effects
can have disadvantages when used in the cockpit due to their dependence on ultraviolet light which is screened by the cockpit glass
What misjudgement may occur if an airplane is flying into fog, snow or haze?
Objects will appear closer than they really are
Objects seem to be farther away than in reality
Objects will appear bigger in size than in reality
Objects seem to move slower than in reality
Depth perception when objects are close (< 1 m) is achieved through
the "blind spot" at the retina
good visibility only
visual memory only
seeing with two eyes (binocular vision)
Adaptation is
the change of the diameter of the pupil
the adjustment of the eyes to high or low levels of illumination
the reflection of the light at the cornea
the adjustment of the crystalline lens to focus light on the retina
