The principle of reversal for level and theodolite is . . . . . . . .
A. If there is a error in a certain part of the instrument, it is doubled by reversing the position of instrument
B. Average of two observation
C. Instrument error by average of any five observations and double it
D. All
Answer: Option A
This Question Belongs to Mining Engineering >> Mine Surveying
The stations choosed by main survey lines called . . . . . . . .
A. Temporary stations
B. Main stations
C. Subsidary station
D. None
The 90° corners of a building are set out on the ground by, easily . . . . . . . .
A. Cross staff
B. Mason's square
C. Theodolite
D. Optical square
The arithmetical check for levelling is . . . . . . . .
A. $$\sum {BS} + \sum {FS = {\text{First RL + Last RL}}} $$
B. $$\sum {FS} - \sum {BS} = {\text{Last RL + First RL}}$$
C. $$\sum {BS} - \sum {FS} = {\text{Last RL}} - {\text{ First RL}}$$
D. All
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