10-46. What is the value of the external distance (E)? 1. 108.10  ft 2. 110.80  ft 3. 112.80  ft 4. 114.60  ft 10-47. What is the value of the middle ordinate (M)? 1. 75.95 ft 2. 82.55  ft 3. 89.85 ft 4. 95.95  ft 10-48. HOW long is the long chord  (LC)? 1. 716.20  ft 2. 718.20  ft 3. 720.10  ft 4. 722.10  ft 10-49. What is the size of the deflection angle you would use for a 50-foot chord? 1. 1°30’ 2. 2°00’ 3. 2°30’ 4. 3°00’ 10-50. With a chord length of 50 feet, what is the distance from the PC to the first point on the curve? 1. 11.10  ft 2. 25.40 ft 3. 38.90 ft 4. 50.00  ft 10-51. The deflection angle used for the distance above is 1. 1°30’ 2. 1°33’ 3. 1°35’ 4. 1°45’ 10-52. What is the deflection angle, d₂, for the last subchord to the PC? 10-53. The degree of curve and the intersecting  angle  are  both  given in degrees and minutes. Which of the  following  actions  should  you take  during  the  computation  to maintain the degree of accuracy? 1. Round off angles to the nearest  tenth  of  a  degree 2. Round off angles to the nearest  hundredths  of  a  degree 3. Convert  angles  to  minutes  for computations 4. Convert  angles  to  seconds  for computations 10-54. The first step in staking out a simple curve is to set the instrument  up  at  what  point? 1.   PC 2.   PI 3.   PT 4. Midpoint 10-55. As a check during the stakeout of a simple curve, the angle from the PI to the PT is measured while the instrument is still at the  PC. The angle should equal which of the  following  values? 1. One half of the central angle 2. One  half  of  the  intersecting angle 3. The  total  of  the  deflection angles 4. Each of the above 10-56. What is gained by using the “backing-in”  method  of  staking out a horizontal curve? 1. Fieldwork  is  accomplished  much faster 2. Curve  distortion  is  minimized by applying the error at the center  of  curve 3. Fewer  instrument  setups  are needed 4. Deflection angles can be turned  more  accurately 1. 0°15’ 2. 0°25’ 3. 0°27’ 4. 0°30’ 71