DFCCIL'21 CE: Daily Practice Quiz. 16-September-2021 |_00.1
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DFCCIL’21 CE: Daily Practice Quiz. 16-September-2021

DFCCIL (Dedicated Freight Corridor Corporation of India Limited) Exam Date 2021 on September and October 2021 so boost your preparation by attempt this Civil Engineering Surveying quiz for DFCCIL recruitment 2021.

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: Surveying

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. In a closed traverse, latitudes and departures of the sides were calculated and it was observed that
Σ Lattitude = 1.39
Σ Departure = –2.17
Calculate the length and bearing of the closing error.
(a) 2.577 m
(b) 2.97 m
(c) 3.25 m
(d) 4.35 m

Q2. Radiation, intersection and resection are
(a) Compass surveying techniques
(b) Chain surveying techniques
(c) Levelling techniques
(d) Plane table surveying techniques

Q3. A line of true length 500 m when measured by a 20 m tape is reported to be 502 m long. The correct length of the tape is
(a) 19.92 m
(b) 20.08 m
(c) 20.80 m
(d) 21 m

Q4. In reciprocal levelling, the error which is not completely eliminated, is due to
(a) earth’s curvature
(b) non-adjustment of line of collimation
(c) refraction
(d) non-adjustment of the bubble tube

Q5. Match List-I with List-II and select the correct answer using the codes given below the Lists :
List – I
A. Reciprocal levelling
B. Trigonometrical levelling
C. Hypsometry
D. Profile levelling
List – II
1. Involves measuring of horizontal distances and vertical angles in field
2. Involves the principle of boiling point of water variation with altitude
3. Involves observing elevations of a number of points along the centre line and their distance along it
4. Involves the principle of two peg test
Codes :
A B C D
(a) 4 1 2 3
(b) 4 2 3 2
(c) 4 1 3 2
(d) 1 2 3 4

Q6. When a theodolite is in proper adjustment, which of the following conditions between fundamental lines are satisfied?
1. Axis of the plate level is perpendicular to the vertical axis.
2. The line of collimation is at right angles to the vertical axis.
3. The axis of the altitude level is parallel to the line of collimation when it is horizontal and the vertical circle reads zero.
Select the correct answer using the codes given below
Codes
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 1, 2 and 3

 

SOLUTION

S1. Ans.(a)
Sol. Given,
Σ latitude=1.39
Σ Departure= -2.17
Now,
Closing error=√((Σ L)^2+(Σ D)^2 )
=√((1.39)^2+(-2.17)^2 )
=2.577 m.

S2. Ans.(d)
Sol. four techniques of plane table surveying.
(i) Radiation
(ii) Traversing
(iii) Intersection
(iv) Resection
S3. Ans.(a)
Sol. true length of survey line (L) = 500 m.
Measured length of the line (L’) = 502 m.
True or designated length of the chain (l) = 20 m.
Actual/ incorrect length of chain (l’) =?
L×l=L^’×l^’
500×20=502×l^’
l^’=500/502×20
▭(l^’=19.92 m.)
S4. Ans.(c)
Sol. Reciprocal levelling is the levelling between two widely separated points in which observation are made in both directions. It eliminates collimation and curvature error fully and refraction error partly.

S5. Ans.(a)
Sol. Reciprocal levelling – Involves the principle of two peg test.
Trigonometrical levelling – Involves measuring of horizontal distances and vertical angles in field.
Hypsometry – Involves the principle of boiling point of water variation with altitude.
Profile levelling – Involves observing elevations of a number of points along the centre line and their distance along it.
S6. Ans.(d)
Sol. When a theodolite is in proper adjustment, the following conditions between fundamental lines are satisfied-
1. Axis of the plate level is perpendicular to the vertical axis.
2. The line of collimation is at right angles to the vertical axis.
3. The axis of the altitude level is parallel to the line of collimation when it is horizontal and the vertical circle reads zero.

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