Online Practice Exam on Irrigation Engineering - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept
(A) 0.20 m
(B) 1.20 m
(C) 2.20 m
(D) 3.20 m

2. Bligh's theory of seepage assumes
(A) Equal weightage to the horizontal and vertical creep
(B) More weightage to horizontal creep than vertical creep
(C) Less weightage to horizontal creep than vertical creep
(D) Loss of head follows the sine curve

3. If D1 and D2 are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is
(A) (D₂ - D₁)3/DD
(B) (D₂ - D₁)3/2DD
(C) (D₂ - D₁)3/3DD
(D) (D₂ - D₁)3/4DD

4. Garnett's diagrams are used for graphical solution of design equations of a canal by
(A) Lacey's theory
(B) Kennedy's theory
(C) Gibb's theory
(D) Lindlay theory

5. To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls
(A) Of R.C.C. or steel plate 8 cm thick
(B) Of height ⅓rd to ¼th the depth of water in the main canal
(C) Spaced at interval of 1½ times their heights
(D) All the above

6. Effective precipitation for a crop may be defined as
(A) Total precipitation minus the loss due to evaporation
(B) Total precipitation minus the loss due to infiltration
(C) Total precipitation during the crop period
(D) Available water stored in soil within root zone of the crop

7. If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is
(A) R (θ + tan θ)
(B) R (θ + cot θ)
(C) R2 (θ + tan θ)
(D) R2 (θ + cot θ)

8. The state of the soil when plants fail to extract sufficient water for their requirements, is
(A) Maximum saturated point
(B) Permanent wilting point
(C) Ultimate utilization point
(D) None of these

9. The useful moisture of soil, is equal to its
(A) Field capacity
(B) Saturation capacity
(C) Moisture content at permanent wilting point
(D) Difference between filed capacity and permanent wilting point within the root zone of plants

10. Groynes are generally built
(A) Perpendicular to the bank
(B) Inclined up stream up to 30°
(C) Inclined downstream up to 30°
(D) All the above

11. Useful soil moisture for plant growth, is
(A) Capillary water
(B) Gravity water
(C) Hygroscopic water
(D) Chemical water

12. A minimum of 90 cm free board is provided if the discharge in the canal is between
(A) 30 to 33 cumecs
(B) 30 to 60 cumecs
(C) Over 60 cumecs
(D) Over 100 cumecs

13. According to Kennedy, the critical velocity (V0) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).
(A) V0 = 0.84 mD0.64
(B) V0 = 0.55 mD0.64
(C) V0 = 0.84 mD0.54
(D) V0 = 0.55 mD0.54

14. For diversion of flood water of rivers, the type of canal constructed, is
(A) Ridge canal
(B) Perennial canal
(C) Inundation canal
(D) Canal

15. Lane's weighted creep theory assumes
(A) Equal weightage to horizontal and vertical creeps
(B) Double weightage to horizontal creep and one weightage to vertical creep
(C) Triple weightage to horizontal creep and one weightage to vertical creep
(D) Triple weightage to vertical creep and one weightage to horizontal creep

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