4-71.
The angle between a magnetic line
of force and the horizontal of the
surface of the earth is known as
the
1.
angle of variation
2.
angle of incidence
3.
entry angle
4.
dip angle
4-72.
MAD equipment is used to measure
which of the following changes in
the earth’s magnetic field near a
large mass of ferrous material?
1.
Long-trace variation and dip
angle
2.
Short-trace variation and
incident angle
3.
Long-trace variation and
incident angle
4.
Short-trace variation and dip
angle
IN ANSWERING QUESTION 4-73, REFER TO
FIGURE 4-20 IN THE TEXTBOOK.
4-73.
The dip angle at the North Pole
comprises approximately how many
degrees?
4-74.
Which of the following conditions
determines the amount of distortion
a submarine will cause in the
earth’s magnetic field?
1.
The submarine’s alignment in
the earth’s magnetic field only
2.
The submarine’s magnetic
qualities only
3.
The submarine’s latitude
position on the earth’s surface
only
4.
The submarine’s alignment in
the earth’s magnetic field,
magnetic qualities, and
latitude position
4-75.
The strength of the magnetic field
of a submarine varies in which of
the following ways with respect to
the distance from the submarine?
1. As the square of the distance
2. As the inverse square of the
distance
3. As the cube of the distance
4. As the inverse cube of the
distance
1.
45°
2.
90°
3.
135°
4.
180°
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