The elevation of a grade line is to be 196.30 ft. at Sta. 5+25 and 176.80 ft. at Sta. 11+75. The rate of grade will be
Field notes for a line of levels are given in Table A. For a backsight taken on the turning point T.P. 1, the height of instrument for this position of the level is
A. 149.27 ft.
B. 156.07 ft.
C. 160.51 ft.
D. 169.17 ft.
For the field notes given in table A, the elevation of the turning point T.P. 3 is
A. 140.95 ft.
B. 152.19 ft.
C 160.85 ft.
D. 181.89 ft.
For the field notes given in Table A, the elevation of Sta. 44+00 to the nearest tenth of a foot is
A. 153.5 ft.
B. 155.7 ft.
C 162.2 ft.
D. 165.3 ft.
A leveling rod with a movable graduated scale is held on a bench mark having an elevation of 68.314 ft, and the movable wooden part of the rod and the graduated scale on it are adjusted so that the rod reading from a level is 8.314 ft. The rod is then held on another point and the rod reading from the same position of the level is found to be 1.26 ft. The elevation of the second point to the nearest hundredth of a foot is
A. 66.26 ft.
B. 67.05 ft.
C. 69.57 ft.
D. 71.26 ft.
When a line of levels is being run with a dumpy level on which the bubble is slightly out of adjustment, the best way to minimize errors in the elevations of turning points is to
A. Center the bubble before each rod reading
B. Use the target for each rod reading
C. Make the length of foresights and backsights approximately equal
D. Make sure that the legs of the tripod are firmly embedded in the ground
On a certain proposed highway, the elevation of grade at Sta. 40+00 is to be 112.00 ft, the rate of grade between Sta. 40+00 and Sta. 50+00 is to be -1.20%, and the rate of grade between Sta. 53+00 and Sta. 63+00 is to be -1.00%. The elevation of grade at Sta. 63+00 is
A. 84.40 ft.
B. 86.40 ft.
C. 89.00 ft.
D. 106.40 ft.
In Table B are given field notes for determining the elevations of several points by using two barometers. The elevation of point d to the nearest multiple of 10 ft., is
A. 1110 ft.
B. 1550 ft.
C. 1470 ft.
D. 1900 ft.
To adjust the horizontal cross line in a dumpy level, the instrument is first setup about midway between two pegs at points A & B which are 480 ft. apart. When the leveling rod is held on each of the pegs, the rod readings are 3.428 ft. at A and 2.556 ft. at B. The level is then setup at a point 9 ft. behind A, the rod readings are again taken on the pegs. The new readings are 5.358 ft. at A and 4.504 ft. at B. To adjust the crossline, it should be moved so that the reading at B will be
A. 3.632 ft.
B. 3.650 ft.
C. 4.486 ft.
D. 5.376 ft.
In Examination Figure 1, the reading of the horizontal cross line xx of a level on the leveling rod, to the nearest thousandth of foot, is
A. 3.627 ft.
B. 3.677 ft.
C. 3.723 ft.
D. 3.773 ft.
In Examination Figure 1, the reading of the leveling rod, to the nearest thousandth of foot, is
A. 10.735 ft.
B. 10.780 ft.
C. 10.825 ft.
D. 10.865 ft.
When a level with three leveling screws has been set up, the line of sight is made horizontal by centering the bubble with the telescope in two positions. These positions should be
A. First, parallel to a line through two of the screws; second, parallel to the same line but rotated 180 degree.
B. First, over one screw; second, parallel to a line through the other two screws.
C. First, over one screw; second, over one of the other screws
D. First, parallel to a line through two of the screws; second , over the other screw.