Irrigation Engineering

21. Attracting groynes are built

  1. Perpendicular to the bank
  2. Inclined down stream
  3. Inclined up stream
  4. None of these

Correct answer: (B)
Inclined down stream

22. B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

  1. D=Δ (8.64 D/B)
  2. B=Δ (8.64 B/D)
  3. D = (8.6 Δ/B)
  4. Δ= (8.6 B/D)

Correct answer: (D)
Δ= (8.6 B/D)

23. Bed bars in a canal are provided

  1. To watch the general behaviour of canal
  2. To measure the discharge
  3. To raise the supply level
  4. To control the silting

Correct answer: (A)
To watch the general behaviour of canal

24. Bligh's theory of seepage assumes

  1. Equal weightage to the horizontal and vertical creep
  2. More weightage to horizontal creep than vertical creep
  3. Less weightage to horizontal creep than vertical creep
  4. Loss of head follows the sine curve

Correct answer: (A)
Equal weightage to the horizontal and vertical creep

25. Borrow pits should preferably be located in

  1. Field on the left side of the canal
  2. Field on the right side of the canal
  3. Fields on both sides of the canal
  4. Central half width of the section of the canal

Correct answer: (D)
Central half width of the section of the canal

26. Canals constructed for draining off water from water logged areas, are known

  1. Drains
  2. Inundation canals
  3. Valley canals
  4. Contour canals

Correct answer: (A)
Drains

27. Canals taken off from ice-fed perennial rivers, are known

  1. Permanent canals
  2. Ridge canals
  3. Perennial canals
  4. Inundation canals

Correct answer: (C)
Perennial canals

28. Cross regulators in main canals are provided

  1. To regulate water supply in the distributaries
  2. To increase water head upstream when a main canal is running with low supplies
  3. To overflow excessive flow water
  4. None of these

Correct answer: (B)
To increase water head upstream when a main canal is running with low supplies

29. Disposal of extra excavated earth of canals, is utilised to provide a spoil bank on

  1. Left side
  2. Right side
  3. Both sides
  4. All the above

Correct answer: (D)
All the above

30. Effective precipitation for a crop may be defined as

  1. Total precipitation minus the loss due to evaporation
  2. Total precipitation minus the loss due to infiltration
  3. Total precipitation during the crop period
  4. Available water stored in soil within root zone of the crop

Correct answer: (D)
Available water stored in soil within root zone of the crop

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