geomatics old study guide Flashcards
You are required to establish grade to the bottom of a footing (BOF) that is 1 foot thick.
The elevation at the top of the footing(TOF) is 102.33’. The elevation of the existing
grade is 106.14’. The backsight (BS) of the instrument on the benchmark (BM) of 100.00’
is 6.78’. What is the correct reading of the rod at the bottom of the footing?
A. 0.64
B. 3.81
C. 4.45
D. 5.45
D 5.45 = 106.78 -101.33
Given a rectangular structure that is 60’ - 9” long by 42’ - 6” wide, what is the diagonal
measurement in feet and inches for squaring up the structure during layout?
A. 51’ - 71/2”
B. 74’ - 13/4”
C. 74’ - 37/8”
D. 103’ - 3”
B 74.14’ = a + b = c , / (42.5) + (60.75) = 74’ - 1/34”
Using a right triangle, at the intersection point the slope distance or the hypotenuse is 310
feet long at a slope angle of 20 degrees 00’ 00”. What is the actual horizontal distance in
feet?
A. 106.02
B. 112.84
C. 291.09
D. 851.73
C 291.09 = cos 20 Degrees (.9397) x 310
What is the percentage grade for a slope ratio of 1:13 (rise:run)?
A. 0.077
B. 1.000
C. 7.690
D. 13.000
C 7.69% = 1/13 x 100
A rod reading of 4.72’ is taken on a BM whose elevation is 813.30. The finish floor (FF)
is 809.00. The top of the batter board is set one foot above the Finish Floor. What rod
reading is required to set the line for the top of the batter board?
A. 4.30
B. 5.30
C. 8.02
D. 9.02
C 8.02 = 818.02 - 810; BM 813.30 + 4.72 = 818.02 HI, FF = 809.00 +1 = 810
We want to mark the grade points at elevation 668.00 for a ceiling grid systems using a
rotating Lazer. When the inverted rod reading is placed on a BM with an elevation of
655.50 the receiver indicates a reading of 5.05 feet. At what reading on the inverted rod
will the receiver be placed so that the ceiling grid will be at the correct elevation?
A. 5.50
B. 7.45
C. 12.50
D. 17.55
D 17.55’ = 668.00 El - 655.50 BM = 12.50 +5.05
Using a right triangle, at the intersection point the slope distance or the hypotenuse is 240
feet long at a slope angle of 33 degrees 00’ 00”. What is the actual height distance?
A. 130.70’
B. 155.81’
C. 201.29’
D. 369.58’
A 130.70 = 240 x SIN 33 Degrees (.5446)
What are the length ratios for a right triangle?
A. 3:3:3
B. 3:3:5
C. 3:4:5
D. 3:6:9
C 3:4:5
Assume you have a right triangle which is 36 feet high and perpendicular from the
baseline. What are the baseline distance and the diagonal distance?
A. The baseline is 24 feet, the diagonal is 48 feet
B. The baseline is 27 feet, the diagonal is 45 feet
C. The baseline is 36 feet, the diagonal is 72 feet
D. The baseline is 48 feet, the diagonal is 60 feet
B a: baseline is 3 x 9 = 27’ , b: vertical height is 4 (36’/4) = 9,
c: diagonal is 5 x 9 = 45’
The jobsite has a primary vertical control point with a reference (BM) of 100 feet. An
instrument is set up with an HI of 5.42 above the BM. A grade stake is set at an elevation
of 96.00’. What is the height reading on the rod for setting the receiver at?
A. 1.42’
B. 4.00’
C. 5.42’
D. 9.42’
D 9.42 = 5.42 + 4.00
Assume that you are looking at the cross section of a concrete lined dike which is 20 feet
wide at the bottom and the sides are set at a 70 degree angle from the bottom (horizontal)
of the dike, the depth of the water flow is 12 feet and the length of the dike is 166 feet.
Using the cross sectional view, how many lineal feet of wetted cross section is there?
A. 32.97
B. 45.54
C. 85.94
D. 104.64
B TAN A = a/b; b= a/TAN A = 12/TAN 70 = 12/2.7475 = 4.36
hypotenuse c = / (12.0) + (4.36) = /163.076 = 12.77 + 12.77 + 20 = 45.54 LF
Assume that you have a concrete lined dike which is 20 feet wide at the bottom and the
sides are sloped at a 70 degree angle from the bottom (horizontal) of the dike. Also, the
depth of the water flow is 12 feet. Using the cross sectional view, how many square feet
are in the wetted cross-sectional flow?
A. 52.32
B. 104.64
C. 292.32
D. 344.64
C ½(12 x 4.36) + ½( 12 x 4.36) = 52.32 ; 12 x 20 = 240 + 52.32 = 292.32 SF
What does the surveying abbreviation TP mean?
A. Tangent Point
B. Turning Point
C. Traverse Point
D. Terminal Poin
b
Which of the following situations would be most advantageous for using an inverted rod?
A. Verifying a highway grid layout
B. Verifying a building footing layout
C. Verifying the elevation of a piece of equipment
D. Verifying the elevation of ceiling mounted duct work
d
The federal and state governments have established elevations of various inland points
throughout the country. What elevation are these points in relationship to?
A. 0’ - 0”
B. 10’ - 0”
C. 100’ - 0”
D. 200’ - 0”
a
