SURVEYING

A line was measured with a steel tape which is exactly 30 m long at 18°C and found to be 452.3.43 m. The temperature during measurement was 32°C. Find the true length of line Take coefficient of expansion of tape per °C = 0.000117

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1 Q.A line was measured with a steel tape which is exactly 30 m long at 18°C and found to be 452.3.43 m. The temperature during measurement was 32°C. Find the true length of line Take coefficient of expansion of tape per °C = 0.000117 Solution: Given data: Length of tape L = 30m Coefficient … Read more

Q.A 30 chain, was tested before the commencement of the day’s work and found 5 cm too long. After chaining a distance of 1600 m, it was checked again and found 10 cm too long. At the end of days work, after chaining 3000 m, the chain was found to be 18 cm. too long. Find the true distance measured.

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Q.A 30 chain, was tested before the commencement of the day’s work and found 5 cm too long. After chaining a distance of 1600 m, it was checked again and found 10 cm too long. At the end of days work, after chaining 3000 m, the chain was found to be 18 cm. too long. … Read more

The distance between the two stations was measured with a 20 m chain and found to be 600 metres. The same was measured with a 30 m chain and found to be 596 metres. If the 20 m chain was 5 cm too short, what was the error in the 30 metre chain?

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1.Q. The distance between the two stations was measured with a 20 m chain and found to be 600 metres. The same was measured with a 30 m chain and found to be 596 metres. If the 20 m chain was 5 cm too short, what was the error in the 30 metre chain? . … Read more

The 30 m chain measured the distance between two points as 540 m. Later, it was discovered that the chain was 6 cm too long. What is the true distance between the points?

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Q. The 30 m chain measured the distance between two points as 540 m. Later, it was discovered that the chain was 6 cm too long. What is the true distance between the points? Solution: True length of the chain, L = 30m Error in chain, e = 6cm = 0.06m too long. Incorrect length … Read more

The 20 m chain measured the length of the line to be 475 m, while the true length of the line was known to be 476.20 m.find the error in the chain

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Q. The 20 m chain measured the length of the line to be 475 m, while the true length of the line was known to be 476.20 m.find the error in the chain  Options: A.0.06m B. O.7m C. 0.45 m D. 0.05 m Solution True length of the chain, L=20m measured length of line = … Read more

LOCAL ATTRACTION OF COMPASS SURVEYING

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LOCAL ATTRACTION OF COMPASS SURVEYING The magnetic needle does not indicates the north direction, when it is under the influence of attractive bodies in its surroundings, such a disturbing influence is termed as “Local attraction”. The disturbing magnetic substances may be iron ore, steel structures, rails, electric cables carrying current, lamp posts, fences and materials … Read more

DEFINITIONS OF COMPASS SURVEYING

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DEFINITIONS OF COMPASS SURVEYING 1. Bearing: The bearing of a line is the horizontal angle, established with reference to a some fixed line, called Meridian. 2. Meridian: Meridian is a fixed direction on the surface of the earth. The bearings of the survey lines are measured with reference to the meridians. The following are the … Read more

TYPES OF COMPASS

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TYPES OF COMPASS There are two types of compasses generally used in surveyling They are (1) The prismatic compass and (2) The surveyor’s compass THE PRISMATIC COMPASS In this compass, the readings are measured with the help of a prism. Hence, it is called prismatic compass. The main advantage of this compass is the sighting … Read more

Whole Circle Bearing (WCB) and Quadrantal Bearing (QB)

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DESIGNATION OF MAGNETIC BEARING The magnetic bearings are designated in two systems, namely 1. Whole circle bearing (WCB) and 2. Quadrantal bearing (QB) 1. Whole Circle Bearing (WCB)Whole Circle Bearing (WCB) and Quadrantal Bearing (QB): The magnetic bearing of a line, with respect to the magnetic north measured in clockwise, established by the prismatic compass … Read more

FORE AND BACK BEARINGS

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FORE AND BACK BEARINGS In compass surveying, two bearings are observed for the each line, one from each end. Fore Bearing: The bearing of a line measured in the direction of the progress of survey is called Fore Bearing or Forward Bearing (FB) of a line AB Back Bearing: The bearing of a line measured … Read more