Reference no: EM13545587
1.The elevation of point M is 875.4. A transit was set at point M and a leveling rod was held vertically at point N. The horizontal cross line of the telescope was inclined so the reading of the horizontal cross line on the rod was 12 ft. The horizontal distance between the points is 250 ft. If the instrument is 5.25 ft above point M and the reading of the vertical limb is 2°, the elevation of N is
A. 873.42. C. 889.83.
B. 889.38. D. 877.38.
2.Angle AEC is to be measured clockwise by the method of repetition. When a backsight was taken to point A, vernier A read 54°02'. Angle AEC was then measured. Vernier A read 84°07'. The measurement was made five more times with the vernier reading the same for the backsight as the previous foresight. The reading of the vernier after the final measurement was 234°37’. The precise magnitude of angle AEC. measured clockwise, is
A. 39°06’10”. C. 48°06’30”.
B. 30°05’50”. D. 30°06’00”.
3.To orient a transit in azimuth when the transit is set up over a point D, a backsight is taken to another point, C, with vernier A set at the azimuth of the line CD and with the telescope in its inverted position. When the upper clamp is loosened, the azimuth of another line DE should be determined by
A. plunging the telescope back to its normal position before sightingalong DE, and then reading vernier B.
B. plunging the telescope back to its normal position before sighting along DE, and then reading vernier A.
C. leaving the telescope inverted and reading the compass circle opposite the south end of the compass needle.
D. leaving the telescope inverted and reading vernier A.
4.A transit is set up over a point M on the ground with the transverse axis of the transit 4.9 ft above that point. A leveling rod is held vertically on another point N. When a sight is taken on the rod, the telescope is inclined so that the horizontal cross line of the transit intersects the rod at a reading of 4.9 ft. The observed reading on the vertical limb of the transit is + 10°13’, but it is found that there is an index error of +3’. If the inclined straight-line distance from point M to point N is 154.82 ft and the elevation of point M is 118.5 ft, the elevation of point N is
A. 146.5 ft. C. 146.1 ft.
B. 146.3 ft. D. 145.8 ft.
5.The points P and B are on opposite sides of the river. To determine the distance between P and B, a point Q is marked on the ground and the following measurements are made: The distance between PQ is 230.0 ft, the angle QPB is 53°30’, and the angle PQB is 80°15’. The distance from P to B is
A. 282.0 ft. C. 168.6 ft.
B. 313.8 ft. D. 187.0 ft.
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