Irrigation Engineering

81. Pick up the incorrect statement from the following:

  1. In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area
  2. In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
  3. In furrow irrigation water is admitted between the rows of plants in the field
  4. None of these

Correct answer: (D)
None of these

82. Process of meandering is due to

  1. Sediment load of streams
  2. Discharge and hydraulic properties of streams
  3. Relative erodibility of the bed and banks
  4. All the above

Correct answer: (D)
All the above

83. Regime conditions in a channel may occur if

  1. Discharge is constant
  2. Channel flows uniformly in incoherent alluvium as that transported in suspension
  3. Silt grade and silt charge are constant
  4. All the above

Correct answer: (D)
All the above

84. Retrogression of the bed level of a river downstream a weir, occurs due to

  1. Heavy impact of water
  2. Increase of the bed level
  3. Less percentage of silt
  4. Soft soil strata

Correct answer: (C)
Less percentage of silt

85. Side slopes generally kept for canals in loam soil, are:

  1. 1 : 1 in cutting and 1½ : 1 in filling
  2. 1½ : 1 in cutting and 2 : 1 in filling
  3. Neither (a) nor (b)
  4. Both (a) and (b)

Correct answer: (D)
Both (a) and (b)

86. Solution of Laplacian equation in three dimensions d2φ/dx2 + d2φ/dy2 + d2φ/dz2 = 0 of water in a syphon, is done by

  1. Analytical method
  2. Khosla's method
  3. Method of relaxation
  4. Unwin's method

Correct answer: (C)
Method of relaxation

87. The consumptive use of water for a crop

  1. Is measured as the volume of water per unit area
  2. Is measured as depth of water on irrigated area
  3. May be supplied partly by precipitation and partly by irrigation
  4. All the above

Correct answer: (D)
All the above

88. The crest level of a canal diversion head work, depends upon

  1. F.S.L. of the canal
  2. Discharge perimeters
  3. Pond level
  4. All the above

Correct answer: (D)
All the above

89. The depth of rice root zone, is

  1. 50 cm
  2. 60 cm
  3. 80 cm
  4. 90 cm

Correct answer: (D)
90 cm

90. The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept

  1. 0.20 m
  2. 1.20 m
  3. 2.20 m
  4. 3.20 m

Correct answer: (B)
1.20 m

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