Irrigation Engineering

41. For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

  1. Bligh's theory
  2. Electrical analogy method
  3. The relaxation method
  4. Khosla's method of independent variables

Correct answer: (D)
Khosla's method of independent variables

42. For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is

  1. Zero
  2. 0.25
  3. 0.5
  4. 1

Correct answer: (D)
1

43. Fundamental momentum equation for a hydraulic jump, is

  1. D12 - D22 = (2q/g) × (V1 - V2)
  2. D22 - D12 = (2q/g) × (V - V2)
  3. D12 - D22 = (2q/g) × (V2 - 1)
  4. D12 + D22 = (2q/g) × (V2 - 1)

Correct answer: (B)
D22 - D12 = (2q/g) × (V - V2)

44. Garnett's diagrams are used for graphical solution of design equations of a canal by

  1. Lacey's theory
  2. Kennedy's theory
  3. Gibb's theory
  4. Lindlay theory

Correct answer: (B)
Kennedy's theory

45. Groynes are generally built

  1. Perpendicular to the bank
  2. Inclined up stream up to 30°
  3. Inclined downstream upto 30°
  4. All the above

Correct answer: (B)
Inclined up stream up to 30°

46. If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to

  1. m3
  2. m1/2
  3. m1/3
  4. m2/3

Correct answer: (B)
m1/2

47. If B and d are the bed width and depth of a channel in metres, the combined losses due to evaporation and seepage in cumecs per kilometre length of the channel, is

  1. (1/50) × (B + d)2/3
  2. (1/100) × (B + d)2/3
  3. (1/150) × (B + d)2/3
  4. (1/200) × (B + d)2/3

Correct answer: (D)
(1/200) × (B + d)2/3

48. If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

  1. Q = 1.71 BD1/2
  2. Q = 1.71 BD
  3. Q = 1.71 BD3/2
  4. Q = 1/71 BD2/3

Correct answer: (C)
Q = 1.71 BD3/2

49. If D1 and D2 are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is

  1. (D2 - D1)3/D1D2
  2. (D2 - D1)3/2D1D2
  3. (D2 - D1)3/3D1D2
  4. (D2 - D1)3/4D1D2

Correct answer: (D)
(D2 - D1)3/4D1D2

50. If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

  1. x = r1 d1
  2. x = r2 d2
  3. x = d1 / r1
  4. x = d2 / r2

Correct answer: (B)
x = r2 d2

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