Question Paper: Surveying 1 Question Paper - Dec 17 - Civil Engineering (Semester 3) - Mumbai University (MU)

0

## Surveying 1 - Dec 17

### Civil Engineering (Semester 3)

Total marks: 80

Total time: 3 Hours
INSTRUCTIONS

(1) Question No. is compulsory.

(2) Attempt any three from the remaining five questions.

(3) Draw neat diagrams wherever necessary

Q1) Answer any five questions:

**1(a)**Define surveying. Classify surveying on the basis of the purposes of the survey.

**1(b)**Differentiate between Whole circle bearing (WCB) and Reduced bearing system. If $\theta$ is the WCB, what would be the reduced bearing in all four quadrants?

**1(c)**Define:

- (i) Chainage
- (ii) Backsight
- (iii) Intermediate sight
- (iv) Change point

**1(d)**Define contour and contour interval. State any four characteristics of contours.

**1(e)**Explain the temporary adjustments of a theodolite.

**1(f)**A tacheometer has a diaphragm with three cross hairs spaced at a distance of 1.20mm. The focal length of the object glass is 24cm and the distance of the object glass from the trunnion axis is 10cm. Calculate the tacheometric constants.

**2(a)**A survey was conducted round a lake and the bearings as shown aside were obtained. Determine which of the stations are affected by local attraction and give the values of the corrected bearings.

Line | AB | BC | CD | DA |
---|---|---|---|---|

FB | $74^0 20'$ | $107^0 20'$ | $224^0 50'$ | $306^0 40'$ |

BB | $256^0 00'$ | $286^0 20'$ | $44^0 50'$ | $126^0 00'$ |

**2(b)**Compare: Surveyors Compass and Prismatic Compass.

**2(c)**A road embankment 30m wide at top with side slope of 2 to 1 have ground levels at 100 meters interval along line PQ as under: P(153.0), 151.8, 151.2, 150.6, (149.2)Q. The formation level at P is 161.4m with a uniformly falling gradient of 1 in 50 from P to Q. Find volume of earthwork by prismoidal formula. Assume the ground to be level in c/s.

**3(a)**Following is the page of a level book. Fill in the missing data. Apply the usual checks. $$ \sum B.S \space is \space 8.445 $$

Station | B.S | L.S | F.S | Rise | Fall | RL | Remarks |
---|---|---|---|---|---|---|---|

1 | 2.150 | 450.000 | BM | ||||

2 | 1.645 | ? | 0.500 | ? | |||

3 | 2.345 | ? | ? | ||||

4 | ? | 1.965 | ? | ? | |||

5 | 2.050 | 1.825 | 0.400 | ? | |||

6 | ? | ? | 451.730 | ||||

7 | (-)1.690 | ? | 0.120 | ? | Inverted staff rdg | ||

8 | ? | 2.100 | ? | ? | |||

9 | ? | ? | 499.100 |

**3(b)**Explain reciprocal levelling with its procedure and purpose.

**3(c)**Write a note on different axes of a theodolite and their interrelationships for the instrument to be in perfect adjustment. (Sketch is desirable)

**4(a)**List the accessories required for Plane Table Survey. Describe the intersection method of plane table survey with its advantage.

**4(b)**Write short notes on:

(i) Gale's traverse table

1843

(ii) Measurement of horizontal angle by method of Repetition.

**4(c)**A 20m chain was found to be 4 cm too long after chaining 1420m. It was 8 cm too long at the end of day's work after chaining a total distance of 2400 m. If the chain was correct before commencement of the work, find the true distance.

**5(a)**Calculate latitudes and departures for the traverse whose details are as shown aside:

Line | Length (m) | WCB |
---|---|---|

AB | 89.31 | $45^0 10'$ |

BC | 219.76 | $72^0 05'$ |

CD | 151.18 | $161^0 52'$ |

DE | 159.10 | $228^0 43'$ |

EA | 232.26 | $300^0 42'$ |

**5(b)**The above perpendicular offsets were taken at 15m intervals from a survey line AB to an

Distance | 0(pt.A) | 15 | 30 | 45 | 60 | 75 | 90 | 105 | 120(pt.B) |
---|---|---|---|---|---|---|---|---|---|

Offset | 2.30 | 3.80 | 4.55 | 6.75 | 5.25 | 7.30 | 8.95 | 8.25 | 5.50 |

irregular boundary line. Calculate the area using Simpson's Rule.

**5(c)**Write down the procedure of Indirect Ranging with a suitable sketch.

**6(a)**Initially, a staff was held vertically at a distance of 46.2m and 117.6m from the centre of a theodolite fitted with stadia hairs and the staff intercepts with the telescope horizontal were 0.45m and 1.15m respectively. The instrument was then set over a station P having RL as 150m, the height of instrument axis being 1.38m. The stadia hair readings on a staff held vertically at a station Q with instrument at P were 1.200, 1.930 and 2.650 m respectively, while the vertical angle(depression) was - 9$^o$30'. Find RL of Q & dist. PQ.

**6(b)**In a 2 plane method exercise, points P and Q are two instrument stations and point R is the point whose elevation is to be known. The values of included angles $\theta$p & $\theta$q are 64$^o$30' & 58$^o$15' respectively. The values of vertical angle $\alpha$p & $\alpha$q are 20$^o$43'20" & 19$^o$44'55" respectively. The height of instrument at P and Q are 1.450 and 1.550 m respectively while the backsights taken on benchmark (RL= 100.125 m) from P & Q are 1.625 and 1.125 m respectively. Distance PQ is 180m. Determine the ground elevations of both the instrument station and elevation of point R.

**6(c)**Explain tie line, check line, base line and main survey line with neat sketch.