CMP 305 EXAM 1 Questions With Revised
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? - answerbefore a permit is issued
Plot pl...
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
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