Explain with neat sketch the procedure of radiation method of plane tabling.

Explain with neat sketch the procedure of radiation method of plane tabling.
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Answer :

1. The table is set at suitable station e.g. P from where all stations can be sighted and measured. 2. After centering and leveling, mark station P as ‘P’ on sheet. 3. Suppose stations A, B, C, and D are to be plotted. 4. Alidade is kept touching ‘P’ to station A is bisected. A ray is drawn along edge of alidade to represent line PA. The distance PA is measured and with suitable scale marked as pa. 5. Similarly station B, C and D are bisected and marked as b, c and d.

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Explain the radiation method of plane table survey with neat sketch.

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What is orientation of plane table? State the procedure of any one method of orientation.

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Describe with neat sketch, the optical square and explain its principle.

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Explain reciprocal ranging with neat sketch.

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Explain Fly Levelling with neat sketch. State situation under which fly levelling is needed.

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Last Answer : Ans: When DifferentialLevelling is done in order to connect a bench mark to the starting point of the alignment of any project, it is called as fly levelling. Fly levelling is also done to connect ...  ii)if distance is more between two points.  iii)if there obstacles between the two points.  

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Explain with neat sketch graphical adjustment of closing error.

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Explain principle of optical square with neat sketch.

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Last Answer :  neat sketch of an arrow with dimensions

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Description : Draw a neat labeled sketch of 30m chain.

Last Answer : neat labeled sketch of 30m chain

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Description : Define base line and check line with neat sketch. 

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Description : Define ‘ Fore bearing ’ & ‘ back bearing ’ of line with a neat sketch

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Description : Draw a neat sketch of prismatic compass and label its component parts

Last Answer : Sketch of prismatic compass and label its component parts

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Description : Differentiate between simple levelling and differential levelling with neat sketch. 

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Describe in brief with neat sketch: i) Base line ii) Check line

Description : Describe in brief with neat sketch: i) Base line ii) Check line

Last Answer : i) Base line:  Base line is generally the longest line running roughly through the middle of the area. It is laid on a level ground as far as possible. The whole frame work is built upon this line. ... on the opposite side or a line joining some fixed point on any two sides of the triangle. 

Draw sketch and write the procedure for setting offset to the left or right side of suvey line with open cross-staff.

Description : Draw sketch and write the procedure for setting offset to the left or right side of suvey line with open cross-staff.

Last Answer : Procedure for setting offset with open cross staff : 1. Keep the ranging rods at point P(fixed on survey line) and at point A1 approximately. 2. The cross staff with stadia rod is fixed ... can be fixed and perpendicular offset AB is said to be set to given survey line PQ in left side.

The method of plane tabling commonly used for establishing the instrument station is a method of (a) Radiation (b) Intersection* (c) Resection (d) Traversing

Description : The method of plane tabling commonly used for establishing the instrument station is a method of (a) Radiation (b) Intersection* (c) Resection (d) Traversing

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Explain Direct method of chaining on sloping ground with neat skeetch.

Description : Explain Direct method of chaining on sloping ground with neat skeetch. 

Last Answer : While chaining on sloping ground, the horizontal distances can be computed by direct method i.e. By stepping. By stepping: It consist in measuring the distance in small horizontal lengths (e.g.L1). Let ... is continued in the correct line with point B. Then length of line AB=L1 +L2 +L3+L4

Explain Orientation of plane table by Back-sighting Method.

Description : Explain Orientation of plane table by Back-sighting Method.

Last Answer : Ans:- The method of setting up the plane table at each of the successive stations parallel to the position it occupied at the starting station is known as an Orientation. Orientation must be done when ... and bisection of the ranging rod at a are perfect then orientation is said to perfect.  

Explain intersection method of plane survey.

Description : Explain intersection method of plane survey.

Last Answer : Intersection method of plane tabling 1. Lay out a base line AB and measure it and Plot a distance ab' on sheet using any scale. 2.Set up instrument at A' with a' over A' 3.Orient the table by ... sighted rays bd, bg, bf, bc are drawn to determine points intersection, d, g, f, c.

Describe back sighting method of orientation of plane table surveying.

Description : Describe back sighting method of orientation of plane table surveying.

Last Answer : Backsight method of orientation 1. Assume we have to orient the table at next station B' represented on paper by point b'. 2.the line ba' is drawn on previous station A'. 3.the alidade is kept ... A'. 4. When the plotted line ab' coincides with line AB' and table will be oriented.

Compare collimation plane method and rise and fall method of reduction of levels.

Description : Compare collimation plane method and rise and fall method of reduction of levels.

Last Answer : The comparison between collimation plane method and Rise and fall method is given below. Collimation plane method Rise and Fall method 1 1. It is rapid method as it involves few calculations. ... Arithmetic check in this method is ΣBS - ΣFS = ΣRise - ΣFall = Last RL - First RL

Differentiate between plane of collimation and rise and fall method.

Description : Differentiate between plane of collimation and rise and fall method.

Last Answer : S.N Rise and fall method Plane of collimation 1 It is slow and more tedious. It is more rapid and less tedious  2 It is laborious as it involves more calculations. It is simple ... .S.-ΣF.S=ΣRise-Σfall =Last RL-First RL Arithmetical check ΣB.S.- ΣF.S=Last RL-First RL

Describe in brief resection method of plane table surveying.

Description : Describe in brief resection method of plane table surveying.

Last Answer : This method is used for establishing the instrument stations only. After fixing the stations, details are located either by radiation or intersection. The characteristic feature of resection is that the point ... of resection are (1)The Two Point Problem, and (2)Three Point Problem.

Which one of the following procedures for getting accurate orientation is the most distinctive feature of the art of plane tabling? (A) Radiation (B) Intersection (C) Traversing (D) Resection

Description : Which one of the following procedures for getting accurate orientation is the most distinctive feature of the art of plane tabling? (A) Radiation (B) Intersection (C) Traversing (D) Resection

Last Answer : (D) Resection

What are offsets? How are they taken and recorded? Explain with sketch.

Description : What are offsets? How are they taken and recorded? Explain with sketch.

Last Answer : Offsets are lateral measurement to the base line. They are Located by judgment if short And by instruments (optical square or cross staff) if long and measured by metallic tape and shown with their chainages on base line

Draw a sketch and explain how to find height of chajja or slab using dumpy level.

Description : Draw a sketch and explain how to find height of chajja or slab using dumpy level.

Last Answer : Explanation : 1. First the back sight reading is taken on floor level whose RL is known to us; from which RL of instrument axis can be find out by adding RL of BM and BS reading. 2. Now ... staff reading. 4. Finally height of chajja is calculated as RL of slab bottom -  RL of floor top.

Explain Procedure for chain and compass traversing.

Description : Explain Procedure for chain and compass traversing.

Last Answer : Chain and compass traversing : 1) Reconnaissance of the area to be surveyed is done. 2) Traverse stations are fixed. 3) The F.B and B.B of the traverse are measured by prismatic compass and ... occur when the traverse is plotted. 6) This error is adjusted graphically by using Bowditch Rule'. 

Explain the procedure of profile leveling for construction of road.

Description : Explain the procedure of profile leveling for construction of road.

Last Answer : The operation of taking levels along the center line of any alignment at regular interval is called longitudinal or profile leveling. Along the alignment, spots are marked at regular interval along ... points are plotted against their chainage to obtain ground profile along the alignment.

Explain with neat sketch stepwise procedure to determine bulk density by sand replacement method.

Description : Explain with neat sketch stepwise procedure to determine bulk density by sand replacement method.

Last Answer : i) A flat area, approximately 450sq.mm of the soil to be tested should be exposed and trimmed down to a level surface, preferably with the aid of the scraper tool. ii) The metal tray with a ... gram. These measurements should be repeated at least thrice and the mean weight (W3) taken.    

Explain temporary adjustment of plane table survey.

Description : Explain temporary adjustment of plane table survey.

Last Answer : 1. Setting over the station: The plane table is fixed on tripod and adjust the table in such a way that table is approximately level. 2. Leveling the table: The tubular or spirit level is placed in two ... . The table can be oriented in two ways. i. Using trough compass. ii. By back sighting.

Draw the sketch of chain triangulation and label different lines.

Description : Draw the sketch of chain triangulation and label different lines.

Last Answer : AB – Base line AC, CD, DE, AE, EB - main survey lines DD’ – Check line. ab – Tie line.

Draw labeled sketch of prismatic compass.

Description : Draw labeled sketch of prismatic compass.

Last Answer : Sketch of prismatic compass :