A S S I G N M E N T
11
Textbook Assignment:
Direct Leveling and Basic Engineering Surveys.
Pages 14-1 through
14-25.
11-1.
Bench marks (BMs) share what
common characteristic?
1.
They are permanent
2.
They are marked with a known
elevation
3.
They are constructed only from
concrete or brass
4.
They are used only for
vertical control
11-2.
To be used as elevation references
in the development or expansion of
a permanent naval station, you
should establish monumented BMs in
which of the following locations?
1.
On all important structures,
such as buildings and piers
2.
At all road intersections
3.
In a grid system 1 mile apart
4.
In a grid system 1/2 mile
apart
11-3.
Level nets are established within
a prescribed order of accuracy and
are tied to what reference?
1.
A BM
2.
A traverse station
3.
A datum
4.
A horizontal control point
11-4.
Mean sea level (MSL) differs from
mean tide level (MTL) in what way?
1.
MSL is the mean of tides
observed in the open sea; MTL
is the mean of inland
tidewater observations
2.
MSL is the result of averaging
tabulated tide readings; MTL
is taken from the tidal curve
3.
MSL is the mean of a large
number of points along a tidal
curve; MTL is the mean of only
the high and low points along
the tidal curve
4.
MSL is the datum used
primarily in hydrographic
surveys; MTL is used as a
datum in any type of survey
11-5.
11-6.
11-7.
11-8.
11-9.
11-10.
The correct way to obtain the MSL
value for a months tide tabulated
record is to add all daily sums
for the month and to divide this
total by the sum of what specific
units of time in that month?
1.
Minutes
2.
Days
3.
Hours
4.
Weeks
What datum is generally used for
measuring the height of a hill?
1.
Mean sea level (MSL)
2.
Mean high water (MHW)
3.
Mean low water (MLW)
4.
Mean low water springs (MLWS)
Assume you are engaged in a
hydrographic survey of the water
approaches to Naval Air Station,
Adak, Alaska.
Your soundings
should refer to what datum?
1.
MLLW
2.
MWL
3.
MTL
4.
MLWS
What type of lubricant is
recommended for use on engineers
levels in arctic regions?
1.
Watch oil
2.
Powdered graphite
3.
Petroleum jelly
4.
Mineral oil
The proper way to remove an
engineers level from its carrying
case is to grasp it firmly by what
part(s)?
1.
The telescope
2.
The footplate
3.
The leveling head
4.
The wye rings
When a level setup must be
transferred to another point or
station, what screws should be
loosened slightly?
1.
Leg and level
2.
Leg and clamp
3.
Level and clamp
4.
Tangent and clamp
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