2011_cvce 105d & svyg 110d_site surveying and levelling alt

The University of Trinidad & Tobago of 4

Alternate to April 2011 Final Examinations

Course Code: SVYG 110D

THE UNIVERSITY OF TRINIDAD & TOBAGO

ALTERNATE TO APRIL 2011 EXAMINATIONS

NETD CIVIL ENGINEERING TECHNICIAN

Course Code and Title: CVCE105D/ (SVYG 110D)

Course Title Site Surveying and Levelling

Date: Time: (3hr)

Read all instructions carefully before you begin this examination.

Materials supplied: Answer booklet

Instructions to Candidates

1. This paper has 4 pages including the title page and 5 questions.

2. You are required to answer ALL questions.

3. Non-programmable calculations are allowed in the exam.

4. Duration of the exam is 3 hours.

5. You are reminded of the need for proper expression and grammar.

6. You must return the question paper along with your answer booklet and other writing

paper to the Invigilator at the end of the examination.

Key Examination Protocol

1. Students are strongly urged to take notice of the Policy on Academic Honesty

2. Sharing of information (communication whether in verbal or non-verbal means) between

candidates during the examination is strictly prohibited.

3. Looking into another candidate’s script is strictly prohibited.

4. Material that is foreign to that allowable or provided in the examination room is prohibited.

5. Speaking without the permission of the Invigilator is NOT allowed.




Question 1

Distinguish between the following pairs of terms:

i) Gross Error and Random Error [4]

ii) Ranging and Chaining [4]

iii) Accuracy and Precision [4]

iv) Step Chaining and Slope Chaining [4]

v) Chainage and Offset [4]

Question 2

a) Explain with the aid of sketches how you would measure a line where a rise in the

ground prevents you from seeing from one station to another. [5]

b) List three factors that one must consider when selecting stations for a chain survey.

[3]

c) Explain what is meant by the term ‘scale’ as it relates to a plan or map. [3]

d) Define the term ‘bearing of a line’. [2]

When are bearings referred to as Azimuth? [1]

e) List three types of systematic errors in taping. [3]

f) State three ways of obtaining a rectangular offset from a chain line. [3]

Question 3

a) i] Explain with the use of diagrams how a traveller could be used in

conjunction with sight rails to control excavation. [6]

ii] Sight rails are to be fixed at P and Q 106.00m apart for the setting out of a server

at an inclination of 1 in 200 rising towards Q. If the levels of the surface are P

32.490m and Q 31.819m, and the invert level at P is 30.712m, at what height

above ground should the sight rails be set for use with a 3m traveler? [8]

b) i] What do you understand by the term levelling? [2]

ii] What is the basic requirement of a level? [2]




Question 4

a) State 6 factors that could affect the accuracy of a levelling exercise apart from a collimation

error in the instrument. [6]

b) Reduce the levels in the table below, by the rise and fall method,

applying appropriate checks. [10]

B.S.

I.S.

F.S.

R.L. [m]

Remarks

1.545 29.093 BM

2.678 1.867 A

1.236 MH1

3.373 MH2

1.897 1.239 B

1.720 MH3

-2.835 Inverted staff

1.345 1.213 F

3.129 X

[MH =Manhole]

c) With the aid of diagrams, explain how a two peg test is used to test for a collimation error.

In doing so also indicate why it is best practice to set up midway between two points when

undertaking differential leveling. [6]




Question 5

(a) What do you understand by the term triangulation? [3]

(b) A sloping line AB was measured in three bays. The slope angle was measured using a

theodolite.

Calculate the length of the line AB. [6]

BAY SLOPE LENGTH (m) THEODOLITE READING

1 42.97 77˚ 27’

2 36.41 78˚ 12’

3 22.18 76˚ 16’

(c) The angle ABC was measured with a theodolite. Using the data below find the mean

reduced angle from both rounds. [6]

Instrument station : B

Round 1

Target Faceleft Faceright

A 26 20 17 206 24 33

C 137 51 30 317 55 56

Round 2

Target Faceleft Faceright

A 262 32 19 82 37 13

C 14 03 37 194 08 37

Explain, using examples the difference between quadrant and whole circle bearings. [5]

END OF EXAM

2011_cvce 105d & svyg 110d_site surveying and levelling alt

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