Canal Falls MCQ

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• What type of crest width is provided in designing a straight glacis fall?
  ক

  Deep Crest

  খ

  Shallow Crest

  গ

  Broad Crest

  ঘ

  Narrow Crest
• What is the shape of upstream wings in design of baffle fall?
  ক

  Trapezoidal

  খ

  Rectangular

  গ

  Circular

  ঘ

  Square
• What type of design does the figure represent?
  ক

  Single vertical drop fall

  খ

  Sarda Type Fall

  গ

  Baffle Fall

  ঘ

  Rapids
• What is the height of the baffle wall in case of designing inglis fall?
  ক

  hb = yc

  খ

  hb = y – y1

  গ

  hb = y1

  ঘ

  hb = yc – y1
• In case of design of sarda type fall the length of crest is kept equal to ____________
  ক

  thickness of the Canal

  খ

  bed Width of the Canal

  গ

  water Depth in the Canal

  ঘ

  hydraulic Jump on the fall
• The length of the weir will not exceed the bed width of the canal upstream, in case of trapezoidal notch fall.
  ক

  True

  খ

  False
• By what value the thickness of notch pier should not be less than the water depth?
  ক

  One fourth of water depth

  খ

  Equal to water depth

  গ

  Half the water depth

  ঘ

  Three fourth of the water depth
• In what intervals the top width of the notch lies?
  ক

  1/2 to full water depth

  খ

  3/4 to full water depth

  গ

  Full water depth

  ঘ

  1/4 to full water depth
• The discharge formula used in the design of the syphon well drop is ____________
  ক

  8/15 Cd. (2g)1/2. tan (Q/2). H5/2

  খ

  2/3 Cd. (2g)1/2. L. H3/2

  গ

  8/15 Cd. (2g)1/2. tan (Q/2). H3/2

  ঘ

  2.22H3/2 [L + 0.4nH
• Which of the following loss is not considered while calculating the total head loss between the inlet well and D/s FSL?
  ক

  Entry and exit losses

  খ

  Loss due to friction

  গ

  Loss due to enlargement of the section

  ঘ

  Loss due to contraction of section
• Calculate the diameter of the inlet well if the X and Y coordinate of the jet (issuing from the centre of pressure) w.r.t the water surface in the inlet well is 1.05 m and 1.88 m respectively.
  ক

  1.575 m

  খ

  2.82 m

  গ

  1.79 m

  ঘ

  0.83 m
• What is the height of the centre of pressure above the water level in the inlet well if the R.L of the centre of pressure is 150.83 m and the R.L of water level in inlet well is 148.30 m?
  ক

  2.53 m

  খ

  1.78 m

  গ

  3 m

  ঘ

  1.99 m
• Calculate the velocity over the notch (V1) and the velocity through the pipe (V3) if the full supply discharge is 2 cumecs. The area of flow over the trapezoidal notch is 0.58 m2. Assume the value of diameter of the pipe used as 1 m.
  ক

  V1 = 3.44 m/sec and V3 = 2.54 m/sec

  খ

  V1 = 2.54 m/sec and V3 = 3.44 m/sec

  গ

  V1 = 3.44 m/sec and V3 = 3.44 m/sec

  ঘ

  V1 = 0.44 m/sec and V3 = 2.04 m/sec
• Consider the following statements. I. Syphon falls are commonly used where high levelled small drains do out-fall into a low levelled bigger drain. II. The D/s well is necessary in case of falls greater than 1.8 m and for discharges greater than 0.29 cumecs. III. The design discharge is determined based on the fact that V-notch is used. Which of the following statement is correct?
  ক

  I only

  খ

  II only

  গ

  I and II

  ঘ

  I, II and III
• ______________ fall is adopted for smaller discharges and larger drops.
  ক

  Ogee fall

  খ

  Sarda fall

  গ

  Glacis fall

  ঘ

  Well-type fall
• Consider the following statements. I. Possibility of combining some other structure with a fall eg. regulator, road bridge etc. II. Cutting and filling are required below and above the fall should not be necessarily equal. III. The command should not be reduced due to the lowering of F.S.L and the fall may be located below the outlets. Which of the following statement is correct for site selection of a fall?
  ক

  I only

  খ

  III only

  গ

  I and II

  ঘ

  I and III
• A canal fall is provided when the available natural slope is flatter than the designed bed slope of the channel.
  ক

  True

  খ

  False
• By providing a natural drop in one drop _______________________
  ক

  the quantity of unbalanced earthwork decreases

  খ

  the quantity of unbalanced earthwork increases

  গ

  the quantity of balanced earthwork increases

  ঘ

  number of fall increases
• In case of branch canals and distributary channels, the falls are located with consideration to _________________
  ক

  command area

  খ

  topography

  গ

  cost economy

  ঘ

  availability of earth material
• For a canal that irrigates the area directly the fall should be provided at a location FSL outstrips the G.L before the bed of the canal comes into the filling.
  ক

  True

  খ

  False
• Canal drops are provided to _______________
  ক

  dissipate the excess energy

  খ

  increase the driving head of flow of water

  গ

  dissipate excess land slope

  ঘ

  dissipate inadequate land slope
• Which type of fall is not adopted in India?
  ক

  Ogee Fall

  খ

  Rapids

  গ

  Inglis Fall

  ঘ

  Montague Type Fall
• What is the reason for the construction of baffle wall in baffle fall?
  ক

  To Maintain Uniform Velocity Flow

  খ

  To Ensure Formation of Jump

  গ

  To Reduce Soil Erosion

  ঘ

  To Ensure Uniform Discharge of the Flow
• Which type of fall is suitable for 60 cumecs discharge and 1.5 m drop?
  ক

  Montague Type Fall

  খ

  Rapids

  গ

  Straight Glacis Fall

  ঘ

  Baffle Fall
• In which fall the depth discharge relationship is unaffected?
  ক

  Trapezoidal Notch Fall

  খ

  Ogee Fall

  গ

  Rapids

  ঘ

  Straight Glacis Fall
• What number of major defects does the ogee fall have?
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• What type of fall does the diagram depict?
  ক

  Ogee Fall

  খ

  Trapezoidal Notch Fall

  গ

  Simple Vertical Drop Type Fall

  ঘ

  Straight Glacis Fall
• What type of fall does diagram represent?
  ক

  Simple Vertical Drop Fall

  খ

  Inglis Fall

  গ

  Straight Glacis Fall

  ঘ

  Ogee Fall
• How many types of falls are present?
  ক

  4

  খ

  5

  গ

  7

  ঘ

  8
• On what factor in case of branch canals, the construction site for a fall depends?
  ক

  Cost of Excavation

  খ

  Topography

  গ

  Commanded Area

  ঘ

  Cost of fall