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Establishment of Calibration Baselines


Quiz Questions

1.The NOS is abbreviated as ____________________________.
National Ocean Service
National Ocean Survey
2. EDMI is abbreviated as ______________________.
Electronic distance measuring instruments
Electronic displacement measuring instruments
3.A Standard calibration baseline comprises of ________ monuments.
Two
Three
Four
4.NGS plans to periodically re-measure a number of selected baselines to test the long-term stability of the monumentation or to re-establish the baselines as necessary.
True
False
5.The standard baseline comprises of ________ monuments set in a straight line with a total length of about ______________.
Two 1400 mt
Three 1400 mt
Four 1400 mt
6.Invar is a _______________ alloy developed in France.
Steel-nickel
Aluminum-nickel
7.What is the unique property of the steel-nickel alloy?
Its coefficient of thermal expansion is about 1/125 that of pure steel
Its coefficient of thermal expansion is about 1/25 that of pure steel.
8.It is required to set the intermediate and terminal monuments within a few centimeters of the suggestd distance.
True
False
9.The need for an intermediate monument about 400 o 430m from a terminal has resulted from the introduction of EDMI with ranges limited to 500m.
True
False
10.Most EDMI are designed such that the basic yard stick for the instrument is 30 or 40m.
True
False
11.For the site selection of a calibration baseline, the location should be easy to reach with minimum restrictions and safe for general public use.
True
False
12.The ideal choice for a site would have a gradual downward slope from the 0 m monument to the middle of the line, then a gradual upward slope to the terminal point with the ends of the line at about the same elevation.
True
False
13.The important consideration here to 100 ft tape calibration station is that the ground over the tape measurements are to be made is reasonably level and always exceeds a 2 − percent grade.
True
False
14.A range should be established within 0.4 km (0.25 miles) of high voltage ( greater than 4Kv) transmission lines, microwave towers, radio masts, or radar facilities.
True
False
15.Monuments cannot protrude slightly above the ground or be set below ground level, depending on specific circumstances.
True
False
16.In concrete monuments, the hole is dug to a depth of _____ to ______ with either a square or circular cross section and about 0.36m or more in diameter.
0.1m to 1.5m
1.1m to 1.5m
0.1m to 1.1m
17.The top form of a concrete monument can be in the shape of a _______________.
Cone
Pyramid
Cylinder
All the above
18.A __________ may be used as a top form for concrete monuments.
Plastic
Paper cement
19.In a rock outcrop, the rock in which a mark is set should be hard and part of the main ledge, not a detached frame.
True
False
20.The main considerations in making the concrete are _________.
Clean materials
Mixture isn’t too wet
Tamp well into the form
All the above
21.The formula for computing the vertical sag is _______________________.
Sag = y =ws²/8t
Sag = y =ws/8t
22.One of the primary purposes for the use of a calibration baseline is to test the user’s ability to set up and plumb their own instruments.
True
False
23.Elevation differences between monuments will not be obtained using double run and third run procedures.
True
False
24.The 150 m section will be measured with 50 m standardized Invar tapes using ______________ taped base line procedures except for the following changes that the copper strip and scribe will not be used.
First order
Second order
25.The 30.48-m section will be measured with a _____________ standardized Invar tapes to a temporary scribe on the 30.48 mark.
50ft
100ft
150ft