Civil Engineering - Surveying - Discussion

26. 

In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by

[A]. adding 180°, if the given bearing is less than 180°
[B]. subtracting 180°, if the given bearing, is more than 180°
[C]. changing the cardinal points, i.e. substituting N for S and E for W and vice-versa
[D]. none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Syed Mohd Bilal said: (Apr 17, 2015)  
BB = FB + or - 180°.

Sandeep said: (Sep 25, 2015)  
For calculating back bearing BB = FB+-180. I Think A & B are correct. How could C?

Nilesh said: (Oct 2, 2015)  
It is quadrant bearing system not whole circle so for back bearing we just have to change the quadrant just opposite of given not sub or add 180.

Alaa Kamal said: (Nov 4, 2015)  
Subtracting 180°, if the given bearing, is more than 180 that right.

Mukesh Maurya said: (Jul 13, 2016)  
Ye, I agree with Nilesh.

Anonymous said: (Jul 21, 2016)  
Quadrant bearing is the use of N-S, E-W in identifying the direction. C is the correct answer.

Durgesh said: (Sep 8, 2016)  
Yes, C is the right answer.

Pooja said: (Nov 4, 2016)  
Quadrant bearing means taking direction with respect to N-S, E-W.

Anonymous said: (Nov 7, 2016)  
You are right @Nilesh.

Annie said: (Jan 23, 2017)  
Yes, you are right @Pooja.

Vikash said: (Feb 6, 2017)  
Can someone explain me the difference between w.c bearing and quadrilateral bearing?

Kekmi Yomgam said: (Feb 27, 2017)  
You are right @Nilesh.

Kekmi Yomgam said: (Feb 27, 2017)  
The value of a quadrantal bearing lies between 0' to 90'.

Quadrantal bearings are obtained by the surveyor's compass.

Urmi Maity said: (Mar 14, 2017)  
In this question, bearing is taken at QB system. Between fore and back bearing the difference is 180'. In QB system certain if we add (when the angle is <90) or subtract 180(when the angle is >90) from a certain angle then the resultant angle can find out by changing N to S and E to W.

Rohan said: (Jul 10, 2017)  
Yes, right @Nilesh.

Kaushal said: (Jan 12, 2018)  
Correct @Nilesh.

Bilash Biswas said: (Feb 5, 2018)  
I agree with you @Urmi.

Akash said: (Jun 6, 2018)  
Yes correct @Nilesh.

Sai said: (Jul 15, 2018)  
Qudratical bearing system is also known as reduced bearing system.

Saugat Oli said: (Jan 11, 2019)  
Yes, right @Nilesh.

Sachin Giri said: (Mar 24, 2019)  
The horizontal angle made by a line with the magnetic north or south (whichever is closer from the line) in the eastward or westward direction is theQuadrantal Bearing or Reduced Bearing of the line.

In quadrantal bearing or reduced bearing, both north and south are considered as reference meridians. Depending upon the position of a survey line, the direction of the reference meridian to the line can be either clockwise or anticlockwise. In the expression of the reduced bearing value of a line, quadrant has to be mentioned in which the line lies.

Jyoti said: (Mar 25, 2019)  
Please anyone explain the correct answers.

Sumit said: (Jul 15, 2019)  
For whole circle Bearing:

BB = FB +-180.
BB = FB +180 (LESS THAN 180).
BB = FB -180 ( MORE THAN 180).

FOR QB SYSTEM:

BB = FB (BUT ONLY DIRECTION CHANGE).
N - S.
S - N.
E - W.
W - E.

Sumit said: (Jul 15, 2019)  
Please explain the answer in detail.

Bheem said: (Sep 3, 2019)  
@Sandeep.

It is quadrant bearing. Not a wcb.

Jinish Patel said: (Dec 12, 2019)  
The horizontal angle made by a line with the magnetic north or south (whichever is closer from the line) in the eastward or westward direction is the Quadrantal Bearing or Reduced Bearing of the line.

SO option C (changing the cardinal points, i.e. substituting N for S and E for W and vice-versa) is right

R.K said: (Jan 30, 2020)  
Please explain it briefly.

Rohan Mukherjee said: (Oct 4, 2020)  
In WCB, back bearing is obtained by BB=FB + or - 180, where subtraction is done when FB is more and addition is done when FB is less than 180.

In Reduced bearing system, or Quadrantal bearing system the numerical are same but the letters are put opposite.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.