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Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE) PDF Download

Question 1: The method of orientation used, when the plane table occupies a position not yet located on the map, is called as    [2017 : 1 Mark, Set-II]
(a) traversing
(b) radiation
(c) levelling
(d) resection

Answer: (d)
Solution: 1. Traversing: 'Traverse’ means to pass across. Traversing refer to the framework of series of lines forming an open or closed polygon.
2. Radiation: It is a method of locating a point by drawing a radial line from the plane table station to the station under consideration.
3. Levelling: It is the method of determining the difference of elevations or levels of different points on the earth’s surface.
4. Resection: It is the method of locating a station occupied by the plane table when the position of that station has not been plotted earlier on the sheet when the plane table occupied other station

Question 2: The VPI (vertical point of intersection) is 100 m away (when measured the horizontal) from the VPC (vertical point of curvature). If the vertical curve parabolic, the length of the curve (in meters and measured along the horizontal) is ________.    [2017 :1 Mark, Set-II]
Solution:
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

Question 3: A circular curve of radius R connects two straights with a deflection angle of 60°. The tangent length is    [2016 : 1 Mark, Set-II]
(a) 0.577 R 
(b) 1.155 R 
(c) 1.732 R 
(d) 3.464 R
Answer: (a)
Solution:
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
Tangent length
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

Question 4: In a survey work, three independent angles, X, Y and Z were observed with weights Wx, WY, Wz, respectively. The weight of the sum of angles X, Y and Z is given by    [2015 : 2 Marks, Set-T]
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
Answer: (a)
Solution: Various laws of weight
Let there be quantities A and B with weight Wa and Wb respectively
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

Question 5: The chainage of the intersection point of two straights is 1585.60 m and the angle of intersection is 140°. If the radius of a circular curve is 600.00 m, the tangent distance (in m) and length of the curve (in m), respectively are    [2014 : 2 Marks, Set-II] 
(a) 418.88 and 1466.08 
(b) 218.38 and 1648.49 
(c) 218.88 and 418.82 
(d) 418.88 and 218.38
Answer: (c)
Solution: 
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
Δ = 180° - 140° = 40°
Length of the curve
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
Tangent distance (7) is the distance between
P-C to P.I (also the distance from P.I to P. T)
⇒ T = T1V
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
= 600 tan 20° = 218.88 m

Question 5: 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 m and 0.210 m, respectively. The ∠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 ______.     [2014 : 2 Marks, Set-II]
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
Answer: 
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
PQ = ks + C
= 100(0.32) + 0.1 = 32.1 m
PR = ks + C
= 100(0.21) + 0.1 = 21.1 m
Applying the cosine rule
Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

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FAQs on Past Year Questions: Tacheometric, Curve, Hydrographic and Plane Table Surveying & Theory of Errors - Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

1. What is tacheometric surveying?
Ans. Tacheometric surveying is a method of surveying that involves measuring both horizontal and vertical distances using an instrument called a tacheometer. It is commonly used in topographic surveys and involves setting up the instrument at different stations to measure angles and distances to various points of interest.
2. How is curve surveying different from other types of surveying?
Ans. Curve surveying is a specialized branch of surveying that focuses on measuring and mapping curves, such as roads, railways, and rivers. Unlike other types of surveying, curve surveying requires specific techniques and instruments, such as the theodolite or total station, to accurately determine the curvature and alignment of these features.
3. What is hydrographic surveying?
Ans. Hydrographic surveying is a type of surveying that involves mapping and measuring bodies of water, including lakes, rivers, and oceans. It is used to collect data about the depth, shape, and features of the water bodies, which is crucial for navigation, maritime engineering, and environmental studies.
4. What is plane table surveying?
Ans. Plane table surveying is a traditional method of surveying that involves using a plane table, alidade, and other accessories to measure distances and angles. The surveyor sets up the plane table at a station and visually observes other points of interest, marking them directly on the paper attached to the table. This method is particularly useful in small-scale surveys and rough terrains.
5. What is the theory of errors in surveying?
Ans. The theory of errors in surveying deals with the analysis and management of errors that occur during the surveying process. It recognizes that measurements are subject to various sources of uncertainties and aims to quantify and minimize these errors to ensure accurate and reliable survey results. This theory includes concepts such as random errors, systematic errors, and the principles of error propagation.
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