Lernkarten

Karten 84 Karten
Lernende 12 Lernende
Sprache English
Stufe Grundschule
Erstellt / Aktualisiert 11.07.2012 / 10.11.2020
Lizenzierung Kein Urheberrechtsschutz (CC0)
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0 Exakte Antworten 0 Text Antworten 84 Multiple Choice Antworten
Fenster schliessen

The time required for complete adaptation is

for day and night: 30 min

for high levels of illumination 10 minutes and for low levels of illumination 30 minutes

for high levels of illumination 10 sec and for full dark adaptation 30 min

for night 10 sec and for day 30 min

Fenster schliessen

The requirement of good sunglasses is to

eliminate distortion in aircraft windshields

fit to the pilots individual taste

absorb enough visible light to eliminate glare without decreasing visual acuity, absorb UV and IR radiation and absorb all colors equally

increase the time for dark adaptation

Fenster schliessen

Why does a deficiency in vitamin A cause night-blindness?

Vitamin A deficiency interrupts the oxygen supply to the photosensitive cells

Accomodation is destroyed

Vitamin A is essential to the regeneration of visual purple

The transfer of light stimulus from the rods to a nerve impulse depends on vitamin A

Fenster schliessen

Scanning at night should be performed by:

avoiding food containing Vitamin A

scanning with one eye open

concentrated fixation on an object (image must fall on the fovea centralis)

slight eye movements to the side of the object

Fenster schliessen

Approaches at night without visual references on the ground and no landing aids (e.g. VASIS) can make the pilot believe of beeing

higher than actual altitude with the risk of overshooting

higher than actual altitude with the risk of landing short ("ducking under")

lower than actual altitude with the risk of overshooting

lower than actual altitude with the risk of ducking under

Fenster schliessen

A pilot is used to land on wide runways only. When approaching a smaller and/or narrower runway, the pilot may feel he is at a

greater height and the impression of landing short

lower than actual height with the tendency to overshoot

greater height than he actually is with the tendency to land short

lower height and the impression of landing slow

Fenster schliessen

Flickering light when reflected from spinning rotor blades

can cause spatial disorientation and/or nausea, when looked at for a longer period of time

can be neglected

can be avoided when the strobe-lights are switched on

should be avoided, because it may destroy the optical nerve

Fenster schliessen

A pilot approaching a runway which is narrower than normal may feel he is at a greater height than he actually is. To compensate he may fly a

higher than normal approach with the tendency to overshoot

compensatory glide path and land long

compensatory glide path and stall out

flatter than normal approach with the tendency to undershoot