Irrigation Engineering

61. In a barrage, the crest level is kept

  1. Low with large gates
  2. High with large gates
  3. High with no gates
  4. Low with no gates

Correct answer: (A)
Low with large gates

62. In a canal syphon, the flow is

  1. Under atmospheric pressure
  2. Pipe flow
  3. With critical velocity
  4. Under negative pressure

Correct answer: (B)
Pipe flow

63. In a concrete canal the approximate permissible velocity of water should not exceed

  1. 0.5 m/sec
  2. 1 m/sec
  3. 1.5 m/sec
  4. 2 m/sec

Correct answer: (D)
2 m/sec

64. In a Sarda type fall, the rectangular crest, may be used for discharge upto

  1. 6 cumecs
  2. 10 cumecs
  3. 14 cumecs
  4. 20 cumecs

Correct answer: (C)
14 cumecs

65. In a syphon aqueduct

  1. Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
  2. Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
  3. Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
  4. Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough

Correct answer: (C)
Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough

66. In case of a trapezoidal notch fall

  1. Top length of the piers should not be less than their thickness
  2. Splay upstream from the notch section is 45°
  3. Splay downstream from the notch section is 22½°
  4. All the above

Correct answer: (D)
All the above

67. In gravity canals, F.S.L. is

  1. Always at the ground level
  2. Always below the ground level
  3. Generally 4 to 5 metres above the ground level
  4. Only a few cm above the ground level

Correct answer: (D)
Only a few cm above the ground level

68. In Montague type fall

  1. A straight glacis is provided
  2. A circular glacis is provided
  3. A parabolic glacis is provided
  4. No glacis is provided

Correct answer: (C)
A parabolic glacis is provided

69. In north Indian Plains, optimum depth of kor watering for wheat, is

  1. 23.0 cm
  2. 19.0 cm
  3. 17.5 cm
  4. 13.5 cm

Correct answer: (D)
13.5 cm

70. In rigid module, the discharge

  1. Is independent of water levels in the distributary and water course
  2. Depends upon the water level in distributary
  3. Depends upon the water level in the water course
  4. Depends upon the water levels of both, i.e. distributary and water course

Correct answer: (A)
Is independent of water levels in the distributary and water course

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