MAIN EXAM
KIGALI INSTITUTE OF SCIENCE AND TECHNOLOGY
INSTITUT DES SCIENCES ET TECHNOLOGIE DE KIGALI
Avenue de l'Armée, B.P. 3900 Kigali, Rwanda
INSTITUTE EXAMINATIONS-SEM: I
ACADEMIC YEAR 2012-2013
FACULTY OF ENGINEERING
DEPARTMENT: CIVIL ENGINEERING & ENVIRONMENTAL TECHNOLOGY
YEAR: 2
MODULE:
DATE:
SEMESTER: I
Surveying I
GROUP: CE, WEE
CEE 3213
/ /2012
TIME: 2hours
MAXIMUM MARKS = 60
INSTRUCTIONS
1. This paper contains FOUR (4) questions.
2. Answer THREE (3) Questions:
Question ONE (1) from Section “A” is Compulsory and Answer any TWO (2)
from Section “B”
3. All questions carry equal marks.
4. No written materials allowed.
5. Do not forget to write your Registration Number.
6. Write all your answers in the booklet provided
7. Do not write any answers on this questions paper.
8. Start the questions in NEW pages
SECTION A: The question in section A is compulsory
QUESTION 1:
i) List down branches and classification of surveying.
(2 Marks)
ii) Briefly write a note on area computation by Trapezoidal method.
(2 Marks)
iii) List down two main assumptions set by Simpsons’ rule in area computation. (2 Marks)
iv) Give briefly Units used for distance and angular measurement in system
international (S.I).
(2 Marks)
v) Convert from given units to the asked:
125 46 35 =……………….Gons
42.4587 Gons=……………….Radians
(2 Marks)
From vi to x choose the best correct answer by writing the corresponding letter
vi)
A theodolite can measure
(a) Difference in level.
(b) Bearing of a line.
(c) Zenith angle.
(d) All the above.
(2 Marks)
vii) If the back sight reading at point A is greater than the fore sight reading at point B then
(a) A is higher than B.
(b) B is higher than A.
(c) Height of the instrument is required to know which point is higher.
(d) Instrument position is required to know which point is higher.
(2 Marks)
viii) Reduced level of a point is its height or depth above or below
(a) The ground surface.
(b) The assumed datum.
(c) Assumed horizontal surface.
(d) The line of collimation.
(2 Marks)
ix) The temperature correction and pull correction
(a) May have same sign.
(b) Always have same sign.
(c) Always have opposite signs. (d) Always have positive sign.
(2 Marks)
x) If two points A and B 125 m apart, have difference in elevation of 0.5 m, the slope
correction to the measured length is
(a) + 0.001 m. (b) 0.001 m.
(c) + 0.0125 m. (d) 0.001 m.
(2 Marks)
SECTION B: Answer any two questions from Section B
QUESTION 2:
a) Determine the values missing in this leveling book
(10 Marks)
b) Explain briefly what is reciprocal leveling and provide its relations
c) Define Methods of leveling with clear examples.
(5 Marks)
(5Marks)
QUESTION 3:
a) A line AB between the stations A and B was measured as 348.28 using a 20 m tape,
too short by 0.05 m. Determine the correct length of AB, the reduced horizontal length of
AB if AB lay on a slope of 1 in 25, and
The reading required to produce a horizontal distance of 22.86 m between two pegs,
one being 0.56 m above the other. (10
Marks)
b) The angles at the stations of a closed traverse ABCDEFA were observed as given below:
Adjust the angular error in the observations, if any, and calculate the correct angles of the
traverse, K=3 and S=20’’ . (10 Marks)
QUESTION 4:
i) A tape of standard length 20 m at 85°F was used to measure a base line. The
measured distance was 882.50 m. The following being the slopes for the
various segments of the line:
Calculate the true length of the line if the mean temperature during measurement was 63°F
–6
and the coefficient of thermal expansion of the tape material is 6.5 × 10
per °F. (10
Marks)
ii) The following readings were taken with a level and 4 m staff.
Draw up a level book page and reduce the levels by the height of instrument
method. 0.578 B.M.(= 58.250 m), 0.933, 1.768, 2.450, (2.005 and 0.567) C.P.,
1.888,
(10 Marks)
1.181,
(3.679
and
0.612)
C.P.,
0.705,
1.810.
MARKING SCHEME, SURVEYING I, MAIN EXAM
i)
Geodetic surveying
Plane surveying
Classification based on Instrument used, purpose of the survey and Nature of the field.
(2 Marks)
ii) Briefly write a note on area computation by Trapezoidal method.
(2 Marks)
iii) List down two main assumptions set by Simpsons’ rule in area computation.
(2 Marks)
-Boundaries are made of parabolic arcs.
-The land contains and divided in to an even number of equal
strips -2/3 area of circumscribing parallelogram.
iv)
The system most commonly used in the measurement of distance and angle is the
‘SystemeInternationale’, abbreviated to SI. The basic units of prime interest are:
Length in metres (m), Km (Kilometers) for distance
(2 Marks)
v) Convert from given units to the asked:
125 46 35 = 139.751543 Gons
42.4587 Gons = 0.67 Radians
vi) d
(2 Marks)
vii) b
(2 Marks)
viii) b
(2 Marks)
ix) a
x)
b
(2 Marks)
(2 Marks)
SECTION B: Answer any two questions from Section B
QUESTION 2:
a) the values missing in this leveling book
b)
(10 Marks)
Reciprocal leveling and provide its relations
(5 Marks)
Reciprocal levelling is employed to determine the correct difference of level between two
points which are quite apart and where it is not possible to set up the instrument between
the two points for balancing the sights. It eliminates the errors due to the curvature of the
earth, atmospheric refraction and collimation.
If the two points between which the difference of level is required to be determined are
A and B then in reciprocal levelling, the first set of staff readings (a1 and b1) is taken by
placing the staff on A and B, and instrument close to A. The second set of readings (a2
and b2) is taken again on A and B by placing the instrument close to B. The difference
of level between A and B is given by:
c) Methods of leveling with clear examples.
Barometric leveling
Spirit leveling and Trigonometric leveling.
(5Marks)
QUESTION 3:
a)
b) The angles at the stations of a closed traverse ABCDEFA were observed as given below:
(10 Marks)
QUESTION 4:
i)
(10 Marks)
ii)