## Tacheometry & Trigonometric Levelling & Remote Sensing for GATE

Tacheometry, Trigonometric Levelling, and Remote Sensing At the intersection of precision measurement, spatial geometry, and cutting-edge observation lies the trio of for GATE aspirants seeking to unravel the complexities and harness the potential of these surveying techniques, this guide offers a roadmap. Join us as we navigate through the principles, applications, and GATE-focused insights to aid your mastery in these indispensable tools of surveying.

## one marks question

**Q 1)** The tangential method of tachometry is

(a) slower than stadia hair method

(b) faster than stadia hair method

(c) preferred as involving less computations to get reduced distance

(d) preferred as chances of operational error are less compared to stadia hair method

**[GATE-1992]**

**Q 2)** Anallatic lens provided in a tachometer is a

(a) concave lens

(b) convex lens

(c) plano-convex lens

(d) plane lens

**[GATE-1992]**

**Q 3)** Tilt of the staff in tachometric survey increases the intercept if it is:

(a) away from the telescope pointing up the hill

(b) towards the telescope pointing up the hill

(c) away from the telescope pointing down the hill

(d) None of above

**[GATE-1990]**

**Q 4)** The number of spectral bands in the Enhanced Thematic Mapper sensor on the remote sensing satellite Landsat-7 is

(a) 64

(b) 10

(c) 8

(d) 15

**[GATE-2017 Set-I]**

## Two Marks Questions

**Q 5)** The vertical angles subtended by the top of a tower T at two instrument stations set up at P and Q, are shown in the figure. The two stations are in line with the tower and spaced at the benchmark (BM = 450.000 m) are also shown in the figure. The reduced level of the top of the tower T (expressed in m) is

**[GATE-2016 Set-II]**

**Q 6)** A tacheometer was placed at point P to estimate the horizontal distances PQ and PR. The corresponding stadia intercepts with the telescope kept horizontal are 0.320 and 0.210 m respectively. The L QPR is measured to be 61°30'30'. If the stadia multiplication constant = 100 and stadia addition constant = 0.10 m. The horizontal distance (in m) between the points Q and R is_________?

**[GATE-2014 Set-II]**

**Q 7)** The horizontal distance between two stations P and Q is 100 m. The vertical angles from P and Q to the top of a vertical tower at T are 3° and 5° above horizontal, respectively. The vertical angles from P and Q to the base of the tower are 0.1° and 0.5° below horizontal, respectively. Stations P, Q and the tower are in the same vertical plane with P and Q being on the same side of T. Neglecting earth's curvature and atmospheric refraction, the height (in m) of the tower is

(a) 6.972

(c) 12.540

(b) 12.387

(d) 128.745

**[GATE-2012]**

**Q 8)** The focal length of the object glass of a tacheometer is 200 mm, the distance between the vertical axis of the tacheometer and the optical centre of the object glass is 100 mm and the spacing between the upper and lower lines of the diaphragm axis is 4 mm. With the line of collimation perfectly horizontal, the staff intercepts are 1 m (top), 2 m (middle) and 3m (bottom). The horizontal distance (m) between the staff and the instrument station is

(a) 100. 3

(С) 150.0

(b) 103.0

(d) 153.0

**[GATE-2008]**

**Q 9)** Determine the gradient from a point, P, to another point, Q, from the following observations made with a tacheometer fitted with an anallatic lens. The constant of the instrument was 100 and the staff held vertically.

Instrument Station | Staff Station | Bearing | Vertical Angle | Staff Reading |

R | P Q | 130^{0}220 ^{0} | +10^{0} 30'+05 ^{0} 06' | 1.255, 1.810, 2,365 1.300, 2.120, 2.940 |

**[GATE-1992]**

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To understand all about the Chain Surveying: The Fundamental For Linear Measurement do visit the following link.

To understand all about the Correction In Chaining/Taping And Ranging In Surveying do visit the following link.