Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 7 (Q.No. 23)
23.
The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is
3.290 m
3.300 m
3.275 m
2.790 m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
18 comments Page 1 of 2.

Prajwal d k said:   2 years ago
The staff reading on the floor + inverted staff reading.

1.505+1.795 = 3.300.
(1)

Spiderman said:   2 years ago
@Swami.

Your explanation is very helpful, thank you.

Mohammad Abas said:   3 years ago
Simple the staff reading on the floor plus inverted staff reading.

1.505 + 1.795 = 3.30m.
(1)

Suryan Swami said:   3 years ago
HI = RL + Staff reading on floor.
= 99.995 + 1.505 = 101.5m.

Here the staff was inverted against the roof and the staff reading is 1.795m.
So, HI + inverted staff reading.
= 101.5 + 1.795 = 103.295m.
So floor level = 103.295 - 99.995 = 3.3m.
(6)

Waleed Khan said:   3 years ago
H.I of Instrument = 99.995+1.505 = 101.5 m.
As the second staff reading is negative this,
= 99.995-1.795= 98.2m.
= 101.5 - 98.2 = 3.3m answer.
(3)

Manav sumara said:   3 years ago
@Ganesh.

How 101.5 + 1.795 = 3.30? It is 103.295.

JAGSEER said:   3 years ago
@Muskaan.

The height of the instrument = 100 + 1.4
RL of line of sight = 100+1.4-1.5 = 99.99.

Muskaan said:   4 years ago
If the benchmark of a station 'A' is 100, Back sight is 1.4m, foresight is 1.5m then what will be the level of the line of sight?

Can anyone answer this?

Sai Ganesh said:   4 years ago
H.I = R.L+B.S.
= 99.995+1.505.
= 101.5.

The Floor Level Below The Slab = H.I+Inverted Staff Reading.
= 101.5+1.795.
= 3.30m.

Jinish said:   4 years ago
We can know, the distance between the floor and slab is always near around 3 m so answer we can predict options which are near about 3 m and second the technical specifications in the questions staff is held inverted so the b.s- f.s= 1.505-(-1.795 ) (- because staff is inverted) and answer is 3.3 m.


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