Irrigation Engineering MCQ

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• Fundamental momentum equation for a hydraulic jump, is
  ক

  $${\text{D}}_1^2 - {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_1} - {{\text{V}}_2}} \right)$$

  খ

  $${\text{D}}_2^2 - {\text{D}}_1^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_1} - {{\text{V}}_2}} \right)$$

  গ

  $${\text{D}}_1^2 - {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_2} - {{\text{V}}_1}} \right)$$

  ঘ

  $${\text{D}}_1^2 + {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_2} - {{\text{V}}_1}} \right)$$
• When the reservoir is full, the maximum compressive force in a gravity dam is produced
  ক

  at the toe

  খ

  at the heel

  গ

  within the middle third of base

  ঘ

  at centre of base
• A land is known as waterlogged
  ক

  when the permanent wilting point is reached

  খ

  when gravity drainage has ceased

  গ

  capillary fringe reaches the root zone of plants

  ঘ

  none of the above
• A river training work is generally required when the river is
  ক

  Meandering

  খ

  Aggrading

  গ

  Degrading

  ঘ

  All the above
• According to Bligh's creep theory, percolating water flows along
  ক

  Straight path under the foundation of the dam

  খ

  Circular path under the foundation of the dam

  গ

  The outline of the base of the foundation of the dam

  ঘ

  None of these
• The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in
  ক

  aqueduct and syphon aqueduct

  খ

  aqueduct and super passage

  গ

  super passage and canal syphon

  ঘ

  level crossing
• Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
  ক

  slope-area method

  খ

  area-velocity method

  গ

  moving boat method

  ঘ

  ultra-sonic method
• If L is total length of a canal in kilometers, P is total perimeter of its lining in metres and C is the cost of lining per square metre, the additional expenditure involved on lining, is
  ক

  $$1000\,{\text{PLC}}$$

  খ

  $$\frac{{{\text{PLC}}}}{{1000}}$$

  গ

  $$\frac{{{\text{PL}}}}{{1000{\text{C}}}}$$

  ঘ

  $$\frac{{{\text{PC}}}}{{100{\text{L}}}}$$
• An outlet which maintains a constant discharge irrespective of fluctuation in the water levels of the supplying channel or water course, is known as
  ক

  Non-modular outlet

  খ

  Semi-modular outlet

  গ

  Flexible modular outlet

  ঘ

  Right modular outlet
• A water-logged land is found suitable for cultivation due to
  ক

  Ease of tillage for preparation of the field for optimum condition of germination

  খ

  Absence of aeration of soil from root zone of the plant

  গ

  Regular supply of water to plants from the water table by capillary action

  ঘ

  None of these
• The "outlet discharge factor" is the duty at the head of
  ক

  main canal

  খ

  branch canal

  গ

  watercourse

  ঘ

  distributory
• Coefficient of discharge of an ogee spillway
  ক

  depends on depth of approach and upstream slope

  খ

  depends on downstream apron interference and downstream submergence

  গ

  remains constant

  ঘ

  both (A) and (B)
• Which of the following spillways is least suitable for an earthen dam ?
  ক

  ogee spillway

  খ

  chute spillway

  গ

  side channel spillway

  ঘ

  shaft spillway
• The major resisting force in a gravity dam is
  ক

  water pressure

  খ

  wave pressure

  গ

  self-weight of dam

  ঘ

  uplift pressure
• The maximum permissible eccentricity for no tension at the base of a gravity dam is
  ক

  $$\frac{{\text{B}}}{2}$$

  খ

  $$\frac{{\text{B}}}{3}$$

  গ

  $$\frac{{\text{B}}}{4}$$

  ঘ

  $$\frac{{\text{B}}}{6}$$
• A hydraulic jump is generally formed when a stream moving with
  ক

  A hyper-critical velocity meets a stream moving with a critical velocity

  খ

  A hyper-critical velocity meets a stream moving with a hyper-critical velocity

  গ

  A hyper-critical velocity meets a stream moving with a sub-critical velocity

  ঘ

  A sub-critical velocity meets a stream moving with a hyper-critical velocity
• If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be
  ক

  equal to rate of rainfall

  খ

  equal to infiltration capacity

  গ

  more than rate of rainfall

  ঘ

  more than infiltration capacity
• For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is
  ক

  Zero

  খ

  0.25

  গ

  0.50

  ঘ

  1.00
• For designing the venturi head,
  ক

  Width of the throat should not be less than one-third of the bed width of main canal

  খ

  Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal

  গ

  Minimum throat width should not be less than 60 cm

  ঘ

  All the above
• River training for depth is achieved by
  ক

  groynes

  খ

  construction of dykes or leavees

  গ

  both (A) and (B)

  ঘ

  groynes and bandalling
• In case of non-availability of space due to topography, the most suitable spillway is
  ক

  straight drop spillway

  খ

  shaft spillway

  গ

  chute spillway

  ঘ

  ogee spillway
• According to Khosla, the exits gradient of surface flow
  ক

  Depends upon the $$\frac{{\text{b}}}{{\text{d}}}$$ ratio

  খ

  Is independent of the $$\frac{{\text{b}}}{{\text{d}}}$$ ratio

  গ

  Is independent of the depths of $$\frac{{\text{b}}}{{\text{s}}}$$ cut off walls

  ঘ

  None of these
• The ratio of the head recovered to the head put in, is known as
  ক

  Efficiency

  খ

  Sensitivity

  গ

  Flexibility

  ঘ

  Modular limit
• F.S.L. of a canal at its head with respect to parent channel is kept
  ক

  At the same level

  খ

  15 cm lower

  গ

  15 cm higher

  ঘ

  None of these
• The level of the floor of a syphon aqueduct can be obtained
  ক

  By subtracting the depth of the culvert from the canal bed level

  খ

  By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level

  গ

  Both (A) and (B)

  ঘ

  None of these
• Which of the following canal outlets maintains a constant discharge ?
  ক

  non-modular outlet

  খ

  flexible outlet

  গ

  rigid module

  ঘ

  none of the above
• A land is said to be water-logged if its soil pores within
  ক

  A depth of 40 cm are saturated

  খ

  A depth of 50 cm are saturated

  গ

  Root zone of the crops are saturated

  ঘ

  All the above
• The field capacity of a soil depends upon
  ক

  Capillary tension in soil

  খ

  Porosity of soil

  গ

  Both (A) and (B)

  ঘ

  Neither (A) nor (B)
• In a concrete canal the approximate permissible velocity of water should not exceed
  ক

  0.5 m/sec

  খ

  1 m/sec

  গ

  1.5 m/sec

  ঘ

  2 m/sec
• If water table is comparatively high, the irrigation canal becomes useless, due to
  ক

  Large amount of seepage

  খ

  Water logging of the cultivated areas

  গ

  Uncertain water demand

  ঘ

  All the above