Irrigation Engineering

91. The difference in level between the top of a bank and supply level in a canal, is called

  1. Berm
  2. Free board
  3. Height of bank
  4. None of these

Correct answer: (B)
Free board

92. The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

  1. 30°
  2. 45°
  3. 60°
  4. 90°

Correct answer: (B)
45°

93. The field capacity of a soil depends upon

  1. Capillary tension in soil
  2. Porosity of soil
  3. Both (a) and (b)
  4. Neither (a) nor (b)

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

94. The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is

  1. 8 cm
  2. 10 cm
  3. 12 cm
  4. 14 cm

Correct answer: (C)
12 cm

95. The intensity of irrigation means

  1. Percentage of culturable commanded area to be irrigated annually
  2. Percentage of gross commanded area to be irrigated annually
  3. Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
  4. Total depth of water supplied by the number of waterings

Correct answer: (A)
Percentage of culturable commanded area to be irrigated annually

96. The Lacey's regime velocity is proportional to

  1. R1/2 S3/4
  2. Q3/4 S1/3
  3. R3/4 S1/3
  4. R2/3 S1/2

Correct answer: (C)
R3/4 S1/3

97. The length and width of a meander and also the width of the river, vary roughly as

  1. Square root of the discharge
  2. Discharge
  3. Square of the discharge
  4. Cube of the discharge

Correct answer: (A)
Square root of the discharge

98. The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of

  1. Reverse curve
  2. Next curve of the same order
  3. Reverse curve plus the width of the river
  4. None of these

Correct answer: (B)
Next curve of the same order

99. The level of the floor of a syphon aqueduct can be obtained

  1. By subtracting the depth of the culvert from the canal bed level
  2. By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level
  3. Both (a) and (b)
  4. None of these

Correct answer: (B)
By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level

100. The main cause of silting up a channel,

  1. Non-regime section
  2. Inadequate slope
  3. Defective head regulator
  4. All the above

Correct answer: (D)
All the above

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