JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year MINE SURVEYING Previous Question Paper (September - 2021 - R18)
Answer any five questions. All questions carry equal marks.
Main
What is Declination? What are different types of variations in Declination?
Answer
Magnetic declination is the horizontal angle between the magnetic meridian and the true (geographic) meridian at any point on the Earth's surface. It indicates the deviation of the magnetic north pole from the true north pole.
The variations in magnetic declination are categorized as follows:
- Secular variation: A slow, long-term change occurring over centuries, caused by the shifting of the Earth's internal magnetic field.
- Diurnal variation: A daily oscillation of the magnetic needle, primarily influenced by the sun's position, reaching its maximum during the day and minimum at night.
- Annual variation: A small yearly change in the declination value.
- Irregular variation: Unpredictable and sudden changes caused by magnetic storms or local disturbances such as solar flares or proximity to magnetic ores.
The magnetic bearing of a line was found to be N 60° 30′ W in the year 1956, when the declination was 5° 10′ E. Find its present magnetic bearing if the declination is 3° W at present.
Answer
First, determine the true bearing of the line using the data from 1956:
Given Magnetic Bearing = N 60° 30′ W (which is 360° - 60° 30′ = 299° 30′ from North)
Next, calculate the present magnetic bearing using the current declination of 3° W (which is treated as negative):
Converting back to quadrant bearing format:
The present magnetic bearing is N 62° 40′ W.
The following data refer to a close traverse ABCDE. Find the lengths of the sides DE and EA.
| Line | Length (m) | Bearing |
|---|---|---|
| AB | 778.50 | 77° 30′ |
| BC | 649.00 | 337° 30′ |
| CD | 660.50 | 284° 48′ |
| DE | ? | 231° 06′ |
| EA | ? | 135° 40′ |
Answer
Sign in to view the complete answer paper.
The latitude and departure of a line AB are +878.65m and +586.25m respectively with respect to the magnitude meridian. If the magnetic declination at the place is 6° 10′ E, find the latitude and departure of the line with respect to the true meridian.
Answer
Sign in to view the complete answer paper.
How will you carry out the permanent adjustment of a Dumpy level?
Answer
Sign in to view the complete answer paper.
Describe the characteristics of Contours.
Answer
Sign in to view the complete answer paper.
What are the common mistakes in levelling? What are the sources of error in levelling?
Answer
Sign in to view the complete answer paper.
What are the various factors effecting contour interval?
Answer
Sign in to view the complete answer paper.
Two stations A and B, 80km apart, have elevations 15m and 270m above mean sea level respectively. Calculate the minimum height of the signal at B.
Answer
Sign in to view the complete answer paper.
What are the points which have to be considered in selection of site for base line measurement?
Answer
Sign in to view the complete answer paper.
The consecutive co-ordinates of a line AB are -647.3 and +457.2 with reference to the magnetic meridian. Calculate its co-ordinates with reference to the true meridian, given that the magnetic declination is 10° 8′ east.
Answer
Sign in to view the complete answer paper.
Calculate latitudes, departure and closing error for the following traverse, and adjusting Bowditch’s rule.
| Line | Length (m) | Whole circle bearing |
|---|---|---|
| AB | 89.31 | 45° 10′ |
| BC | 219.76 | 72° 05′ |
| CD | 151.18 | 161° 52′ |
| DE | 159.10 | 228° 43′ |
| EA | 232.26 | 300° 42′ |
Answer
Sign in to view the complete answer paper.
Obtain an expression for the horizontal distance between a tacheometer station and a staff station for an inclined line of sight, if the staff is held normal to the line of collimation.
Answer
Sign in to view the complete answer paper.
Two tangents intersect at an angle of 150°. If they are to be connected by a 10° curve. Calculate various elements of curve that is Length of curve, Apex distance and Tangent Length.
Answer
Sign in to view the complete answer paper.
Enumerate the factors considered for selection of mine correlation survey methods.
Answer
Sign in to view the complete answer paper.
State the principle of EDM with a neat sketch.
Answer
Sign in to view the complete answer paper.