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# Survey (161-180)

Updated: Apr 24, 2020

161. The shape of the vertical curve generally provided is parabolic

162. Perpendicular offset from the junction of transition curve and circular curve to the tangent is equal to four times the shift

163. If the radius of circular curve is five times the length of the transition curve, then the spiral angle is given by 1/10 radian

164. If L is the length of transition curve and R is the radius of circular curve, then the shift of the curve is directly proportional to 1/R and L²

165. If an upgrade of 1.5% is followed by a downgrade of 0.5% and rate of change of

grade is 0.2% per 20m chain, then the length of vertical curve is 200 m

166. The difference in elevation of points between a vertical and a tangent is

directly proportional to the square of its horizontal distance from the point

of tangency

i) Shift bisects the transition curve,

ii) Transition curve bisects the shift

168. The maximum value of centrifugal ratio on roads and railways respectively are

taken as 1/4 and 1/8

169. Agonic line is the line joining points having zero declination

170. For a circumpolar star, declination must be more than colatitude

171. For a star at its upper transit, the local sidereal time is equal to R.A. of the star

172. The limiting minimum declination of a circumpolar star having latitude 40° N is 50°

173. The relationship between tropical year TY and sidereal year SY is

TY<SY

174. A star has a declination of 55°N. Its upper culmination is in the zenith of the place. The altitude of the lower culmination is 20°

175. A vertical photograph was taken from an aircraft flying at an altitude of 2000 m above mean sea level. The focal length of the camera is 175 mm. The scale of the photograph for a hill of an elevation of 250m is 1/10000

176. In an aerial photograph, if the photograph has a tilt of 3° & the focal length is 100mm, then the distance between the perspective center & the plumb point will be 100/cos 3°

177. In aerial photograph, if the photograph has a tilt of 4° & the focal length is 200 mm, then the distance between the principal point & plumb point will be

200 tan 4°

178. When the wind effect is not considered during flight planning, the result is a

drift

179. An aircraft is flying at a ground speed of 200 km/h. The focal length of the camera is 200 mm. The ground distance covered along the flight line between exposures is 2 km. The time interval between exposures is given by 36 sec

180. The relief displacement is radial from

principal point on a vertical photograph ,nadir point on a tilted photograph