Introduction, Simple Curves, Deflection Angle Method

Question 1

A survey made without the use of basic surveying equipment

Answer 1

Reconnaissance survey

Question 2

A survey made to pin and mark the points for construction

Answer 2

Preliminary survey

Question 3

A survey used/undertaken during the construction phase

Answer 3

Final Survey

Question 4

First step in undertaking a survey

Answer 4

Reconnaissance survey

Question 5

Second step in undertaking a survey

Answer 5

Preliminary survey

Question 6

Last step in undertaking a survey

Answer 6

Final survey

Question 7

Degree of Curve (D) - Arc Basis Formula

Answer 7

D = 1145.916/R

Question 8

Degree of Curve (D) - Chord Basis Formula

Answer 8

R = 10/sin(D/2)

Question 9

Point of tangency where the curve
leaves the tangent

Answer 9

Point of Curvature (PC)

Question 10

Point of
tangency where the curve
meets the other tangent

Answer 10

Point of Tangency (PT)

Question 11

Point
of where the two tangents meet

Answer 11

Point of Intersection (PI)

Question 12

Angle of intersection of the tangents

Answer 12

Central Angle (I)

Question 13

Distance measured from PC or PT to the
vertex or PI

Answer 13

Tangent Distance (T)

Question 14

Arc length from PC to PT

Answer 14

Length of Curve (LC)

Question 15

Straight line
drawn from PC to PT

Answer 15

Long Chord (C)

Question 16

Radius of the circular curve

Answer 16

Radius (R)

Question 17

Distance measured from the vertex to the midpoint of the curve

Answer 17

External Distance (E)

Question 18

Measured from the midpoint of the curve to the midpoint of the chord

Answer 18

Middle Ordinate (M)

Question 19

Formula of Tangent Distance (T)

Answer 19

T = Rtan(I/2)

Question 20

Formula of Length of Curve (LC)

Answer 20

LC = 20I/D

Question 21

Formula of Long Chord (C)

Answer 21

C = 2Rsin(I/2)

Question 22

Formula of External Distance (E)

Answer 22

E = R[1/cos(I/2)-1]

Question 23

Formula of Middle Ordinate (M)

Answer 23

M = R[1-cos(I/2)]

Question 24

Formula of Station PC

Answer 24

Sta PC = Sta PI-T

Question 25

Formula of Station PT

Answer 25

Sta PT = Sta PC+LC

Question 26

A chord that measures less than the full chord

Answer 26

Subchord (c)

Question 27

An angle that measures less than the given degree of curve

Answer 27

Subangle (d)

Question 28

Formula of d1

Answer 28

d1 = c1D/20

Question 29

Formula of d2

Answer 29

d2 = c2D/20