11.
The face of the 5-inch signal lamp must be masked when used for sightings of less than how
many kilometers?
A.
8
B.
16
C.
30
D.
40
12.
At what distance is a signal lamp focused when the light from the lamp is at its maximum
concentration in a circle slightly larger than the lens of the lamp?
A.
25 feet
B.
75 feet
C.
100 feet
D.
150 feet
EN0593
2-50
Previous Page
