CMP 305 EXAM 1 QUESTIONS WITH CORRECT ANSWERS
What are 3 reasons to survey? - Answer--protect owner/builder against costly errors in measurement
-esatblish property/building lines
-where/how the structure is to be located
When are plot plans required? - Answer-before a permit is issued
P...
What are 3 reasons to survey? - Answer--protect owner/builder against costly errors in
measurement
-esatblish property/building lines
-where/how the structure is to be located
When are plot plans required? - Answer-before a permit is issued
Plot plans show... - Answer-Shows the location of the structure and indicates the
distances to property lines
Purpose of leveling - Answer-For planning and layout
Leveling for planning is to... - Answer-To establish the necessary elevations to develop
plans for such structures as buildings, roads, terraces
Leveling for layout is to... - Answer-To assure the structure are built according to the
elevations shown on the plans
leveling instrument - Answer-A telescope containing both vehicle and horizontal cords
hairs an a spirit level (vial) to indicate when the instrument is level
Types of leveling - Answer-Differential
Profile
Topography
Differential leveling - Answer-Finding the difference in elevation between 2 points
Profile - Answer-Determining the elevation fo points at measured distances along a
selected line
Topography - Answer-Determining the elevation of spaced grid points, use contour lines
to show hills, valleys, slopes
Benchmark (BM) - Answer-Known point of elevation (reference point)
Backsight (BS) - Answer-This is added to the BM elevation to get HI
, HI - Answer-Height of instrument
Foresight (FS) - Answer--Differential leveling: only one FS for each instrument
- profile & topographic :may make many FS per set up
- FS is subtracted from HI to find the elevation of the point
turning point (TP) - Answer-Temporary benchmark, where FS & BS rod reading are
taken
Notebook layout - Answer-6 columns
-STA
-BS
-HI
-FS
-Elev.
- Notes: length of site, drawing, sketch, date, time, weather (right side of notebook)
HI - Answer-BM elev + BS
TP elev + BS
TP elevation - Answer-HI - FS
Accuracy for differential leveling depends on: - Answer--Centering the bubble
-keep the rod vertical
-equal sights for BS & FS
-length of sight
-ensure reading of correct foot mark
Types of levels - Answer-Dumpy
Self compensating
Dumpy level - Answer-Straight line measurement
4 screws for leveling
Horizontal angles (no vertical)
Self compensating leve - Answer-3 screws
Cats eye for vial
Transit & theodolites - Answer-Both work in the vertical and horizontal plane, rotate
angles, vertical measurement
Transit level - Answer-More traditional with a few automatic features
Theodolite level - Answer-Can read angles very accurate - to 1 second or an arc
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