From Page 61
(3) You're right.
Both of these glare devices are good examples of HFE
input.
Glare is a visual example of bow man's physiological capabilities can
be adversely affected and, thus, hinder successful performance.
To
reinforce the importance of accounting for man's physiological capabilities
and limitations (as well as the various factors that affect these
capabilities) when designing all aspects of a system, let's look at an
auditory example. In many military situations, it is important to know the
limits of noise detectability and nondetectability. If you'll recall, this
information is included in MIL-STD-1474 (see Page 26). By looking at this
table, you should be able to calculate how near to the sound a person has to
be in order to be heard at a certain distance. Now, how loud must a 2,000
Hz alarm be to be heard 4,000 meters away?
(1) The alarm must be between 84 and 108 dB. Turn to Page 35.
(2) The alarm must be at least 100 dB, but not more than 110 dB.
Turn to
Page 43.
(3) The alarm must be at least 108 dB. Turn to Page 39.
(4) None of these choices are correct. Turn to Page 32.
From Page 56
(2) Very important, but to do this properly, you must first know what a task
is. Try again. Return to Page 56.
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