MNG 211 Review Questions With Complete Answers 100% Verified.

how many active satellites comprise the U.S. GPS system? - correct answer 24 How many GPS satellites are required for positioning? - correct answer 4 What are the three major segments of the U.S. GPS system? - correct answer 1. space segment 2. control segment 3. user segment Explain how a GPS receiver calculates its position - correct answer Satellite and receiver both know the time and transmit a signal of the current time and other information. The receiver compares current time to the signal it receives and finds the difference between the two times List three benefits of GPS surveying - correct answer 1. offers high accuracy for point measurement 2. can be used to establish new control points 3. requires less man-power than surveying with a total station List three limitations of GPS - correct answer 1. maximum attainable precision is not as high as BPM 2. limited use near trees and buildings 3. requires physical access to the survey point What is the purpose of post-processing? - correct answer The purpose of post-processing is so that data can be sent to the system for further correction and data correction can be reported back to the surveyor This type of survey obtains information for locating natural and man-made features of well as varying ground elevations - correct answer Topographic In the mine mapping, a degree value obtained from true north as 0 degrees and rotating clockwise is to the object of interest is known as - correct answer Azimuth The vertical distance above or below some arbitrary level surface or datum (such as sea level) is known as - correct answer Elevation When 152.624 is multiplied by 18.1 the answer with the correct number of significant figures is - correct answer 2760 a sight taken with the level to a point of unknown elevation is known as a - correct answer Foresight A fixed point or object, often temporary in nature, used in leveling where the rod is held first for a foresight and then for a back sight is known as - correct answer Turning point Which leveling technique is the most accurate? - correct answer Direct A zenith is a - correct answer Vertical angle taken from the origin being directly above the point of measure List all the meridian types: - correct answer - Astronomical - Magnetic - Grid - Assumed Types of equipment that can be used directly measured distances - correct answer - EDM - Total station Name 4 things that surveying is used for - correct answer 1. Property lines 2. Natural resource databases 3. Mapping 4. To guide direction for civil projects Name 4 required skills as a surveying professional: - correct answer 1. Calculus 2. Trigonometry 3. Instrumentation 4. Organization Name two sources (not type) of error in surveying - correct answer 1. Natural errors 2. Instrumental errors Difference between accuracy and precision - correct answer Accuracy is the degree of closeness to a true value; and precision is the repeatability of the measurement. Explain the stadia methods for measuring distance in words, not equations - correct answer 1. For horizontal differences, use any linear distance measuring tool to measure the physical ground distance from foresight/back sight to instrument.2. For vertical distances, use the datum, known istrument height, back sight elevation, and foresight elevation to find the vertical distance of any point in relation to the datum what is a datum? - correct answer A known elevation to be used as a benchmark What two correction must be considered when doing vertical elevation surveys? - correct answer 1. end elevation correction 2. angular misclosure End elevation correction - correct answer (BM2 - BM1 ) = (totBS - totFS) Explain how EDM instruments using electro-optical mechanisms measure distance - correct answer An inferred light beam that is shout out and reflected towards the instrument via a reflective prism to read distance What is the difference between an open and closed traverse? - correct answer The difference between the two is that a closed traverse starts and ends on points with known location and an open traverse starts with a known point, but ends on a point with unknown location. An open traverse is usually not used since the error in location measurements cannot be computed. However, if an open traverse is used, measurement should be taken repeatedly. What type of surveying yields location data obtained from images that are often taken by aircraft or satellites? - correct answer Photogrammetric the fixed reference point for an object that has known coordinates and is permanent is known as what? - correct answer Benchmark A closed loop deflection angle traverse with 8 sides to complete it, what should the deflection angles sum to? - correct answer (n-2)(180)= 1080 ft What should a closed loop interior angles sum to? - correct answer (n-2)(180) What is the most common vertical datum? - correct answer Mean Sea Level What is the difference between direct and indirect measuring? - correct answer Direct - measurement of a line with a ruler, tape or electronic deviceIndirect - Obtained by a relationship