CN126 Surveying Practice
s
School of the Environment
Examinations 2005-2006
CN126
SURVEYING PRACTICE
Instructions to Candidates
Time allowed: TWO hours
Answer ALL questions
Monday 23 January 2006 9:00 – 12:00 hours
Page 1 of 6
CN126 Surveying Practice
Question 1
For the traverse shown in Figure 1, point P has coordinates of 110.000 mE,
165.000 mN.
Calculate


the coordinates of the unknown stations X, H and A
the fractional linear misclosure
X
87.933 m
110°50′10″
H
108°30′15″
66.717 m
P
118.245 m
87°36′44″
157.281 m
53°03′11″
A
All angles shown are observed values
All distances are horizontal
Bearing of line PX = 35°10′ 35″
Coordinates P = 110.000 mE, 165.000 mN
Figure 1
(40 marks)
Page 2 of 6
CN126 Surveying Practice
Question 2
The coordinates of three points are
A = 210.000mE, 350.000mN
B = 129.687mE, 405.219mN
C = 268.774mE, 312.050mN
Calculate the whole circle bearings and horizontal distances AB, AC and BC.
(10 marks)
Question 3
The extract given below is from a level book and shows staff readings taken
between two TBMs.
______________________________________________________________
BS
IS
FS
Remarks
______________________________________________________________
1.525
1.471
1.690
TBM 38.077 m
CP
A
1.869
B
2.364
2.058
E
2.650
F
2.660
G
2.368
2.110
CP
2.659
2.587
CP
2.851
2.793
CP
3.005
TBM 37.009 m
______________________________________________________________
1.689
1.745
Calculate adjusted reduced levels for all entries in the book.
(20 marks)
Page 3 of 6
CN126 Surveying Practice
Question 4
15 Multiple choice questions
Please choose the MOST CORRECT ANSWER for each question.
If you think the answer to Question 4.1 is e write 4.1 = e in your answer book.
Repeat for all questions.
TWO points each
4.1
The three basic surveying measurements are
a
b
c
d
e
4.2
In levels, parallax is caused by
a
b
c
d
e
4.3
The compensator must be checked before every reading
The compensator ensures that the viewed line of sight is horizontal
The coincidence bubble reader must be set carefully
It does not have to be levelled
It is not necessary to check any readings
When levelling points which will be used later as TBMs
a
b
c
d
e
4.5
An incorrect setting of the compensator
An incorrect setting of the eyepiece and telescope focus
Moving the eye whilst looking through the telescope
Refraction along the line of sight causing it to bend
None of these
When using an automatic level
a
b
c
d
e
4.4
Levelling, taping and total stations
Height, distance and angle
Angle, coordinates and distance
Tapes, EDM and levels
None of these
The rise and fall method of calculation should be used
The HPC method of calculation should be used
It is best not to use intermediate sights
An automatic level must be used
None of these apply
When using a digital level
a
b
c
d
e
It is not necessary to level the instrument as this is done electronically
Readings are taken automatically without the need to read a staff
Great care is needed when writing staff readings on the booking form
It must be connected to a computer for data transfer
None of these apply
Continued
Page 4 of 6
CN126 Surveying Practice
4.6
The primary purpose of engineering surveying on a construction site is to
a
b
c
d
e
4.7
When working on surveying projects, it is best to
a
b
c
d
e
4.8
Is much lighter and more flexible in use
Is much more accurate
Must be handled with care to avoid bending or kinking
Has graduations every mm
Is none of these
GPS is an abbreviation for
a
b
c
d
e
4.11
Is always an arbitrary direction chosen for convenience
Is measured anticlockwise from a chosen north direction
Lies in the range 0 – 360°
Lies in the range 0 to ± 180°
Is none of these
Compared to a steel tape, a plastic tape
a
b
c
d
e
4.10
Hurry to complete work to avoid making mistakes
Always check work where possible
Only measure values once to avoid confusion in bookings
Have a partner with you who has done surveying before
Avoid all of these
The whole circle bearing of a line
a
b
c
d
e
4.9
Produce maps or plans of the site
Measure and cost volumes of material moved around the site
Carry out as-built surveys for a project
Ensure that the project is built with the correct dimensions and in the
correct location
Monitor for structural movement
Global Positioning System
General Positioning System
Global Precise Surveying
General Purpose Surveying
None of these
When a total station has been levelled
a
b
c
d
e
The line of sight is horizontal
The horizontal reading is 00° 00′ 00″
The vertical axis is vertical
The instrument has been centred
None of these apply
Continued
Page 5 of 6
CN126 Surveying Practice
4.12
Coordinates are used extensively in building and surveying for
a
b
c
d
e
4.13
When using a total station
a
b
c
d
e
4.14
Levelling is not necessary as this is done automatically
All angle and distance readings are referenced to zero
Always make sure you have enough batteries with you
There is no need to remove parallax
None of these apply
In surveying, horizontal position is defined as
a
b
c
d
e
4.15
Measuring bearings and distances
Defining horizontal position
Measuring distances and angles
Defining heights
None of these
X and Y axes
X and Y coordinates
A bearing and a distance
An easting and northing
None of these
When measuring horizontal angles
a
b
c
d
e
The horizontal circle is set so that 00° 00′ 00″ is the first reading
Two rounds must be taken to check for any mistakes
Only one round can be taken
Face right readings are not necessary
None of these apply
(30 marks in total for Question 4)
Page 6 of 6