Define base line and check line with neat sketch.

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

1)Base Line : The longest line running roughly through the middle of the area to be surveyed is known as base line

2) Check line: The line joining the apex of a triangle to some fixed point on the opposite side.

OR

A line joining some fixed point on any two sides of a triangle is known as check line. 

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Related questions

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

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Explain with neat sketch graphical adjustment of closing error.

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With neat sketch, write the procedure of measurement of fore bearing with compass.

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Draw a neat sketch of optical square. Explain its working.

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Explain with neat sketch the procedure of reciprocal ranging.

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Explain with neat sketch method of stepping of chaining on sloping ground.

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Explain the process of chaining on sloping ground by stepping method with neat sketch.

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

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

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Draw sketch and explain method of traversing of plane table surveying.

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Draw the sketch of chain triangulation and label different lines.

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

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Draw labeled sketch of prismatic compass.

Description : Draw labeled sketch of prismatic compass.

Last Answer : Sketch of prismatic compass :

Draw sketch of optical square and state its principle.

Description : Draw sketch of optical square and state its principle.

Last Answer : The optical square is an instrument used to set perpendicular offset on the chain line. The optical square works on the principle of optics. Principle of optical square: The angle between the incident ray and reflected ray is twice the angle between mirrors.

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

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Define : 1) Bench mark 2) Datum surface 3) Line of collimation 4) Change Point

Description : Define : 1) Bench mark 2) Datum surface 3) Line of collimation 4) Change Point 

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Define horizontal line and vertical line.

Description : Define horizontal line and vertical line.

Last Answer : Horizontal line : A straight line tangential to the level line and perpendicular to the plumb line is called horizontal line.  Vertical line : A line perpendicular to horizontal line and coinciding plumb line is known as vertical line

Define: i) Level Line, ii) Horizontal Line, iii) Vertical Line iv) Bench Mark.

Description : Define: i) Level Line, ii) Horizontal Line, iii) Vertical Line iv) Bench Mark. 

Last Answer : j) Level Line: It is line lying in a level surface; it is therefore, normal to the plumb line at all points. ii) Horizontal Line: It is a straight line tangential to the level line at a ... RL determined with reference to the datum line. They serve as reference points for finding RL of new points. 

Define the term: (1) Level surface (2) Line of collimation

Description : Define the term: (1) Level surface (2) Line of collimation

Last Answer : Level surface: It is a surface parallel to the mean spheroidal surface of the earth. It is normal to the direction of plumb line at all points. The surface of still water is an example of level ... to the optical center of object glass and its continuation. It is also called as line of sight. 

Define the following terms: (i) Level surface {ii) Datum line (iii) Reduced level (iv) Axis of telescope

Description : Define the following terms: (i) Level surface {ii) Datum line (iii) Reduced level (iv) Axis of telescope

Last Answer : i)Level Surface : Any surface is parallel to mean spheroidal surface of earth is said to be a level surface. The water surface of still lake is also considered to be level surface. ii) ... an imaginary line passing through the optical Centre of object glass and optical Centre of the eye piece.

State the purposes of following methods of leveling. i)Profile leveling, ii)Fly leveling, iii)Check leveling iv)Reciprocal leveling

Description : State the purposes of following methods of leveling. i)Profile leveling, ii)Fly leveling, iii)Check leveling iv)Reciprocal leveling

Last Answer : 1. Profile leveling- To determine the undulation of ground surface along given line for alignment of road, canal or pipe, railway line 2. Fly leveling-It is used to for connecting B.M. to ... is used to find the difference in leveling between two points two point obstructed due to river or pond.

Define fly leveling and profile leveling

Description : Define fly leveling and profile leveling

Last Answer : Fly Leveling adopted to transfer bench marks from one place to other .In this leveling only FS & BS are taken.  Profile leveling:- The operation in which the object is to determine the ... known distanced apart along a given line to obtained the accurate outline of the surface of the ground 

Define: WCB and Quadrantal Bearing system

Description : Define: WCB and Quadrantal Bearing system

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Define orientation. State two methods of orientation. Which method is most accurate and why?

Description : Define orientation. State two methods of orientation. Which method is most accurate and why? 

Last Answer : Orientation is the process of keeping plane table in same position as that is occupied in previous station. Methods of orientation: i) Magnetic meridian method using trough compass ii) Back ... and not by using trough compass. Therefore there is no error occurring due to local attraction.

Define the terms i) Fore Bearing, ii) Open traverse, iii) Closing error, iv) Reduced bearing

Description : Define the terms i) Fore Bearing, ii) Open traverse, iii) Closing error, iv) Reduced bearing

Last Answer : i) Fore bearing : The bearing observed in the direction of progress of survey in clockwise manner is called fore bearing  ii) Open traverse : When the first and last survey lines does ... north or south direction in clockwise or anticlockwise manner is known as reduced or quadrantal bearing. 

Define Dip and deflection of needle.

Description : Define Dip and deflection of needle.

Last Answer : Dip of the magnetic needle: It is the upward or downward movement of magnetic needle in vertical plane due to earth's gravitational force is known as dip of needle. Deflection of needle : ... west direction, that horizontal angle between magnetic and true north is said to be declination of needle.

Define Change point and its necessity in leveling.

Description : Define Change point and its necessity in leveling.

Last Answer : Change point : It is the point at which both backsight and foresight readings are taken before and after shifting the level instrument. Necessity of change point in leveling : It is ... observations from single station due to large area, abrupt ground level variation and unavoidable obstruction. 

Define local attraction. State two causes of local attraction.

Description : Define local attraction. State two causes of local attraction.

Last Answer : Local attraction: It is the deviation or deflection of magnetic needle from its normal position under influence of external magnetic forces is called as local attraction. Causes of local attraction : 1. Iron ... structure 2. Electric cable line 3. High voltage current 4. Bunch of key 5. Steel Tape 

Define : i) Traversing ii) Magnetic Meridian

Description : Define : i) Traversing ii) Magnetic Meridian

Last Answer : i) Traversing : Traversing is the series of survey lines connecting successive established traverse stations along the route of survey  ii) Magnetic Meridian : The direction indicated by ... and properly balanced Magnetic needle unaffected by local attractive force is called magnetic meridian.

Define true bearing and magnetic bearing.

Description : Define true bearing and magnetic bearing.

Last Answer : 1. True bearing – (i) The angle between true meridian or geographical north and any line known as true bearing. 2.Magnetic bearing-(i)The angle between magnetic meridian and any line is known as magnetic bearing.

Define surveying.

Description : Define surveying.

Last Answer : Surveying- It is branch of civil engineering in which relative positions of ground points are determined by taking linear and angular measurement.