Irrigation (141-160)

Updated: Apr 25, 2020

141. A runoff river plant is suitable only on a perennial river

142. The net head under which the turbine reaches its peak efficiency at synchronous speed is called design head

143. The ratio of the average load to the installed capacity of the plant whose

reserve capacity is zero will be equal to load factor,plant factor

144. A hydroelectric scheme operating under a head of 80 m will be classified as

high head scheme

145. A hyetograph is a graphical representation of rainfall intensity and time

146. Variability of rainfall is largest in regions of scanty rainfall

147. In India, which of the following is adopted as standard recording raingauge ?

natural syphon type

148. The maximum average depth due to one day storm over an area of 100 km² is

100 mm. Depth-Area-Duration (DAD) curves indicate that for the same area of

100 km² the maximum average depth for a 3 hour storm will be

more than 100 mm

149. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by 1-(0.99)¹⁰

150. The most suitable chemical which can be applied to the water surface for reducing evaporation is cetyl alcohol

151. Interception losses are due to evaporation

152. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If Φ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is 6.0

153. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ? slope-area method

154. In the moving boat method of stream flow measurements, the following measurements are required

i) velocity and direction of current meter

ii) depths and time interval between depth readings

155 To determine the discharge at a section in a stream from its rating curve, the required data are stage at the section


156. The stage of river carrying a discharge of Q m³/sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same

stage of 10 m with a water surface slope of(l/1000)will be

2 Q m³/sec

157. The stream which does not have any base flow contribution is called ephimeral strean

158. The flow-mass curve is graphical repre sentation of cumultative discharge, volume and time in chronbldgical order

159. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that demand cannot be met by inflow

160. The shape of recession limb of a hydrograph depends upon basin characteristics only

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