10-16.What is the approximate truebearing of the object if the localdeclination is 10°w and the localattraction is 20°E?1.S80°W2.S100°W3.N80°W4.N100°E10-17.What method should you use tocorrect or convert a compassazimuth reading to a true azimuthreading when both local attractionand local declination areeasterly?1.Subtract the attraction anddeclination from the compassreading2.Add the attraction anddeclination to the compassreading3.Add the attraction to thecompass reading, then subtractthe declination from the sum4.Add the declination to thecompass reading, then subtractthe attraction from the sum10-18.When making a closed traversecompass-tape survey, for whatreason should you first read andrecord the back bearing of atraverse line from the first setuppoint?1.To offset local attraction2.To get rid of declination3.To check the accuracy of yourcompass4.To verify the last bearing youwill takeIN ANSWERING QUESTION 10-19, REFER TOFIGURE 13-8 IN YOUR TEXTBOOK.10-19.Suppose that in the compass-tapesurvey field notes shown, thebearing AE is different from thebearing EA.This difference couldhave resulted from which of thefollowing conditions?1.Inaccuracy in reading the backbearing2.Inaccuracy in reading theforward bearing3.The difference in the strengthof the local attractions at Aand E4.Each of the above10-20.Station A bears N70°E (true) fromstation B and station C bearsS10°W (true) from station B.Whatsize of angle should be entered inthe “computed interior angle”column of a compass-tape surveynotebook page alongside theforward bearing of station C?1.60°2.80°3.120°4.240°10-21.What is the sum of the interiorangles in a closed traverseconsisting of six traverse lines?1.360°2.540°3.720°4.1,080°10-22.If a compass is in error when youare taking bearings at severaldifferent places and each errorvaries from the preceding one, theerrors are probably due to whichof the following factors?1.A shifted movable circle2.A bent frame3.A bent pivot4.A bent needle10-23.The only compass available fortaking bearings has an instrumenterror.What forward bearingshould you use when the compassneedle indicates a forward bearingof N22°W and a back bearing ofS24°E?1.S2°E2.S46°W3.N46°E4.N23°W10-24.You are using a compass that hasan instrument error and isgraduated for azimuths.Whatforward azimuth should you recordwhen the compass needle indicatesa forward azimuth of 37° and aback azimuth of 219°?1.37°2.38°3.91°4.128°68
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