Irrigation Engineering Set 5

This set of Irrigation Engineering Multiple Choice Questions & Answers (MCQs) focuses on Irrigation Engineering Set 5

Q1 | The main cause of meandering is
• presence of an excessive bed slope in the river
• the extra turbulence generated by the excess of river sediment during floods
• none of the above
Q2 | Tortuosity of a meandering river is always
• equal to 1
• less than 1
• greater than 1
• less than or equal to 1
Q3 | Select the correct statement.
• A meander increases the river length but a cut off reduces the river length.
• A cutoff increases the river length but a meander reduces the river length.
• Both meander and cutoff increase the river length.
• Both meander and cutoff decrease the river length.
Q4 | River training for depth is achieved by
• groynes
• construction of dykes or leavees
• both (a) and (b)
• groynes and bandalling
Q5 | Main purpose of mean water training for rivers is
• flood control
• to provide sufficient depth of water in navigable channels, during low water periods
• to preserve the channel in good shape by efficient disposal of suspended and bed load
• all of the above
Q6 | If D is the depth of scour below original bed, then the width of launching apron isgenerally taken as
• 1.2 D
• 1.5 D
• 2.0 D
• 2.5 D
Q7 | Study the following statements.i) Levees are constructed parallel to river flow,ii) Spurs are constructed parallel to river flow,iii) Levees are constructed transverse to river flow,iv) Spurs are constructed transverse to river flow.The correct answer is
• (i) and (ii)
• (i) and (iv)
• (ii) and (iii)
• (iii) and (iv)
Q8 | A repelling groyne is aligned
• pointing upstream
• pointing downstream
• perpendicular to bank
• parallel to bank
Q9 | A river training work is generally required when the river is
• meandering type
• both (a) and (b)
Q10 | A river bend characterized by silting
• scouring on concave side
• silting on convex side
• scouring on convex side and on concave side
• scouring on concave side and silting on convex side
Q11 | Select the incorrect statement.
• Intensive irrigation should be avoided in areas susceptible to water logging.
• Extensive irrigation should be adopted in areas susceptible to water logging.
• Lift irrigation increases water logging.
• all of the above
Q12 | A land is known as waterlogged
• when the permanent wilting point is reached
• when gravity drainage has ceased
• capillary fringe reaches the root zone of plants
• none of the above
Q13 | Lining of irrigation channels
• increases the waterlogging area
• decreases the waterlogging area
• does not change the water logging area
• none of the above
Q14 | A runoff river plant is
• none of the above
Q15 | The net speed under which the turbine reaches its peak efficiency is called
• design speed
• rated speed
• gross speed
• operating speed
Q16 | A runoff river plant
• is a medium head scheme
• generates power during peak hours only
• is suitable only on a perennial river
• has no pondage at all
Q17 | The net head under which the turbine reaches its peak efficiency at synchronous speed iscalled
Q18 | The ratio of the average load to the installed capacity of the plant whose reserve capacity iszero will be equal to
• plant factor
• utilisation factor
• both (a) and (b)
Q19 | A hydroelectric scheme operating under a head of 80 m will be classified as
• none of the above
Q20 | A hyetograph is a graphical representation of
• rainfall intensity and time
• rainfall depth and time
• discharge and time
• cumulative rainfall and time
Q21 | Variability of rainfall isi) largest in regions of high rainfallii) largest in coastal areasiii) largest in regions of scanty rainfallThe correct answer is
• only (i)
• (i) and (ii)
• only (iii)
• (ii) and (iii)
Q22 | In India, which of the following is adopted as standard recording raingauge ?
• Symon's raingauge
• tipping bucket type
• natural syphon type
• weighing bucket type
Q23 | 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
• 100 mm
• more than 100 mm
• less than 100 mm
• none of the above
Q24 | 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
• (0.99)10
• 1 - (0.99)10
• (0.9)'00
• l-(0.9)100
Q25 | The most suitable chemical which can be applied to the water surface for reducingevaporation is
• methyl alcohol
• ethyl alcohol
• cetyl alcohol
• butyl alcohol