Test: Reciprocal Levelling - Civil Engineering (CE) MCQ

# Test: Reciprocal Levelling - Civil Engineering (CE) MCQ

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## 10 Questions MCQ Test Geomatics Engineering (Surveying) - Test: Reciprocal Levelling

Test: Reciprocal Levelling for Civil Engineering (CE) 2024 is part of Geomatics Engineering (Surveying) preparation. The Test: Reciprocal Levelling questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Reciprocal Levelling MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reciprocal Levelling below.
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Test: Reciprocal Levelling - Question 1

### Which of the following type of levelling is necessary across a river ravine or any obstacle requiring a long site between two points?

Detailed Solution for Test: Reciprocal Levelling - Question 1

When it is necessary to carry a levelling across a river ravine or any obstacle requiring a long site between two points so situated that no place for the level can be found from which the lens of foresight and backsight will be even approximately equal, special method that is reciprocal levelling must be used. It is used to obtain better accuracy.

Test: Reciprocal Levelling - Question 2

### Statement I): Reciprocal levelling is adopted to decide the difference of level between two points, a considerable distance apart, with great precision. Statement II): Reciprocal levelling eliminates errors due to curvature, refraction and collimation.

Detailed Solution for Test: Reciprocal Levelling - Question 2

Reciprocal levelling is adopted to accurately determine the level difference between two points which are separated by obstacles like a river, ponds, lakes, etc.
It eliminates the following errors:
i) error in instrument adjustments i.e error due to collimation
ii) the combined effect of Earth's curvature and the refraction of the atmosphere
iii) variation in the average refraction
Important Points:
Reciprocal levelling eliminates the error due to collimation and error due to curvature of Earth completely, but as the refraction depends upon the atmosphere which may change every minute;

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Test: Reciprocal Levelling - Question 3

### In reciprocal levelling, the error which is not completely eliminated, is due to:

Detailed Solution for Test: Reciprocal Levelling - Question 3

​Reciprocal Leveling

• ​This technique of leveling work is used to find the exact height difference or to find the exact RL(Reduce level) of the point by equalizing the distance when there is a large obstruction like a river, ponds, lakes, etc. in direction of the survey.
• It eliminates the following errors:
(i) error in instrument adjustments i.e error due to collimation
(ii) the combined effect of Earth's curvature and the refraction of the atmosphere
(iii) variation in the average refraction.

Important Point
Reciprocal leveling eliminates the error due to collimation and error due to curvature of Earth completely, but as the refraction depends upon the atmosphere which may change every minute.

Test: Reciprocal Levelling - Question 4

The following observations were taken during reciprocal levelling to find the difference in elevation between two points P and Q, located on either banks of a wide river. If the reduced level of the point P is +60 m, determine the reduced level of the point Q?

Detailed Solution for Test: Reciprocal Levelling - Question 4

The true difference between levels P and Q, by using the concept of reciprocal leveling, is given as:

Where a and b are readings taken when the instrument is at or near P and c and d are readings when the instrument is at or near Q.
RL of point  Q = RL of Point P – h
Calculation:
a = 1.96 and b = 1.36 m; c = 2.02 m and d = 1.52 m
On substituting the values of a, b, c, and d in the above formula, we get

h = 0.55 m
Now, the Reduced Level of point Q is calculated as:
RL of Q = 60 – 0.55 = 59.45 m

Test: Reciprocal Levelling - Question 5

Reciprocal levelling eliminate the effect of:

1. Errors due to atmospheric refraction
2. Errors due to earth’s curvature
4. Errors due to collimation line

Which of these statements are correct?

Detailed Solution for Test: Reciprocal Levelling - Question 5

Reciprocal levelling is adopted to accurately determine the level difference between two points which are separated by obstacles like a river, ponds, lakes, etc.
It eliminates the following errors:

• error in instrument adjustments i.e error due to collimation
• the combined effect of Earth's curvature and the refraction of the atmosphere
• variation in the average refraction

Important Points

• Reciprocal levelling eliminates the error due to collimation and error due to curvature of Earth completely, but as the refraction depends upon the atmosphere which may change every minute;
Test: Reciprocal Levelling - Question 6

Which of the following type of levelling is used when two points so situated that no place for the level can be found from which the lens of foresight and backsight will be even approximately equal?

Detailed Solution for Test: Reciprocal Levelling - Question 6

When it is necessary to carry a levelling across a river ravine or any obstacle requiring a long site between two points so situated that no place for the level can be found from which the lens of foresight and backsight will be even approximately equal, special method that is reciprocal levelling must be used. It is used to obtain better accuracy.

Test: Reciprocal Levelling - Question 7

When an instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When the instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find true R.L. of Q?

Detailed Solution for Test: Reciprocal Levelling - Question 7

When observations are taken from P the apparent difference in elevation between P and Q is 2.748 – 1.824 = 0.924. When observations are taken from Q the apparent difference in elevation between P and Q is 1.606 – 0.928 = 0.678. Hence true difference in elevation is (0.924 +0.678)/2 = 0.801 m. Therefore true elevation of Q is 126.386 – 0.801 = 125.585 m.

Test: Reciprocal Levelling - Question 8

When an instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find the error due to collimation?

Detailed Solution for Test: Reciprocal Levelling - Question 8

When observations are taken from P the apparent difference in elevation between P and Q is 2.748 – 1.824 = 0.924. When observations are taken from Q the apparent difference in elevation between P and Q is 1.606 – 0.928 = 0.678. Hence true difference in elevation is (0.924 +0.678)/2 = 0.801 mts. Error in observation = 0.924 – 0.801= 0.123 m. Error due to curvature and refraction is 0.069 mts. Therefore error in collimation is 0.123 – 0.069 = 0.054 m.

Test: Reciprocal Levelling - Question 9

When instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find combined effect correction for curvature and refraction?

Detailed Solution for Test: Reciprocal Levelling - Question 9

Combined correction for curvature and refraction is 0.06728 d2 = 0.06728(1.010)2 = 0.069 m.

Test: Reciprocal Levelling - Question 10

When instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find combined correction for curvature and refraction?

Detailed Solution for Test: Reciprocal Levelling - Question 10

Combined correction for curvature and refraction is 0.06728 d2 = 0.06728(1.010)2 = 0.069 mts.

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## Geomatics Engineering (Surveying)

19 videos|31 docs|35 tests