LESSON ONE
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
A. Closed cycle.
Some infrared sights and devices have coolant cartridges to
cool the detectors, but the AN/TAS-4A has a closed cycle
cooler. (Page 2, Para. 2.)
2.
B. Infrared passive.
The AN/TAS-4A Night Sight is a passive infrared system.
(Page 2, Para. 1.)
3.
C. Long.
While there are some infrared devices that have short-
wavelength sensing systems, the AN/TAS-4A has a long-
wavelength system. (Page 1, Introduction)
4.
D. To let the gunner choose field-of-view.
Depending upon terrain conditions and other considerations
the gunner may wish to view the target from narrow or wide
field-of-views. (Page 3, Figure 1-2.)
5.
A. Detectors.
In the night sight the detectors are used to convert IR
energy to video signals. (Page 8, Figure 1-7.)
6.
C. Cooler only.
The cooler is the only part of the night sight to have
power applied with the power ON/OFF/STBY switch in the
standby position. (Page 5, Figure 1-4.)
14
MM4812
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