Q. In the subtense bar method, the horizontal angle subtended by two targets fixed on a horizontal bar at a known distance apart is measured at instrument station by theodolite.

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Q. The two targets are at a distance s apart, and each at s/2 from the centre, i.e. vertical axis. The horizontal angle α is measured carefully by means of a theodolite. Then what is the value of D in the subtense bar method?

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Q. The following readings were taken with a tachometer on to a vertical staff. Horizontal Distance Stadia Readings 46.20 m 0.780; 1.010; 1.240 51.20 m 1.860; 2.165; 2.470. Calculate the tacheometric constants.

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Q. Stadia readings were taken with a theodolite on a vertical staff with the telescope inclined at an angle of depression of 3º30′. The staff readings were 2.990, 2.055 and 1.120. The reduced level of the staff station is 100.000m, and the height of the instrument is 1.40 m. What is the reduced level of the ground at the instrument? Take constants as 100 and zero.

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Q. A tacheometer is setup at an intermediate point on a traverse course PQ and the following observations are made on a staff held vertical. Staff Station Vertical Angle Staff Intercept Axial Hair Readings P + 9º30′ 2.250 2.105 Q + 6º00′ 2.055 1.975. The constants are 100 and 0. Compute the length PQ and the reduced level of Q. RL of P = 350.50 m.

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Q. The horizontal angle subtended at the theodolite station by a subtense bar with vanes 3 m apart is 0º 10 ′40′′. Calculate the horizontal distance between the theodolite and the subtense bar?

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Q. The vertical angles to vanes fixed at 1 m and 3 m above the foot of the staff held vertically at a station P were – 1º 45′ and + 2º 30′, respectively. Find the horizontal distance and the reduced RL of P if the RL of the instrument axis is 110.00 m?

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Q. The following notes refer to a traverse run by a tacheometer fitted with an anallactic lens, with constant 100 and staff held vertical. Line, Bearing, Vertical Angle, Staff Intercept -PQ, 30º 24′, + 5º 06′,1.875; QR, 300º 48′, + 3º 48′,1.445; RS, 226º 12′, − 2º 36′, 1.725 respectively. Find the length and bearing of SP.

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Q. Distance and elevation formulae for fixed hair method assuming the line of sight as horizontal and considering an external focusing type telescope is D = Ks + C. where C is _______

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Q. Following observations were taken with a tacheometer fitted with an anallactic lens having value of constant as 100.
Calculate the horizontal distance between P and Q.

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