Mine Surveying - Study Mode
[#161] The accuracy of measurement for determing the depth of vertical shaft would be
Correct Answer
(C) 1 in 5000
[#162] The stations choosed by main survey lines called . . . . . . . .
Correct Answer
(C) Subsidary station
[#163] The drawing of an irregular area is covered by 42.2 squares of 200 mm side. If the side of the drawing is 10mm = 1m, the actual area of field . . . . . . . .
Correct Answer
(A) 16880m 2
Explanation
Solution: The correct answer is Option A: 16880m 2 . To find the actual area of the field, we need to calculate the area covered by the squares and then adjust for the scale factor. The area covered by the squares is given by: [ ext{Area of each square} = ext{Side}^2 ] [ ext{Area of each square} = (200 , ext{mm})^2 ] [ ext{Area of each square} = 40000 , ext{mm}^2 ] Since there are 42.2 squares, the total covered area is: [ ext{Total covered area} = 42.2 imes ext{Area of each square} ] [ ext{Total covered area} = 42.2 imes 40000 , ext{mm}^2 ] Now, to convert this area to square meters (1m = 1000mm), we use the scale factor: [ ext{Actual area} = left( frac{ ext{Total covered area}}{ ext{Scale factor}^2}
ight) ] [ ext{Actual area} = left( frac{42.2 imes 40000}{(10 , ext{mm})^2}
ight) ] Now, calculate the actual area to get the answer. The correct answer is Option A: 16880m 2 .
[#164] The 90° corners of a building are set out on the ground by, easily . . . . . . . .
Correct Answer
(B) Mason's square
[#165] The arithmetical check for levelling is . . . . . . . .
Correct Answer
(C) $$sum {BS} - sum {FS} = { ext{Last RL}} - { ext{ First RL}}$$