This set of Railway Engineering Interview Questions and Answers for freshers focuses on “Modern Surveying Techniques for Difficult Terrain”.
1. Which organization provides the maps for satellite imagery?
Explanation: Satellite imagery is used for surveying of difficult terrains. It provides a bird’s eye view of the area and the maps are updated once a month.
2. Using satellite imagery multiple corridors can be marked. After this the corridor that satisfies all the surveying criteria can be chosen.
Explanation: Detailed analysis of the ground can be done with the help of satellite imagery and topographic maps. With the help of these the best corridor is chosen which satisfies all surveying prospects and can be further analysed.
3. For which areas satellite imagery is most useful in the initial stages of planning?
a) Where support data and existing map coverage are inadequate
b) Where map coverage is insufficient and field evaluation is difficult
c) Area with Insufficient support data and difficult field evaluation
d) Area with Inadequate support data, existing map coverage and difficult field evaluation
Explanation: Satellite imagery is most useful in areas having challenging terrain where surveying is very difficult. It can also be very helpful in case of an area having insufficient map coverage and support data.
4. The miniature details for the preliminary survey can be can be worked out with the help of contour maps, computer aids and ______
a) photogrammetric plotted sheets
b) satellite images
c) aerial photographs
d) auto level
Explanation: Some details of the rail line, which are difficult to obtain manually, are determined with the help of Digital Terrain modelling. This is done with the help of contour maps, computer aids and Photogrammetric plotted sheets.
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