Practice Test: Question Set - 03
1. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
- (A) 1.25 D
- (B) 1.50 D
- (C) 1.75 D
- (D) 2.00 D
2. According to Lacey, in regime conditions
- (A) Silt is kept in suspension by vertical components of eddies
- (B) Entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
- (C) Both (a) and (b)
- (D) Neither (a) nor (b)
3. The most suitable section of a lined canal, is
- (A) Triangular section with circular bottom for small canals
- (B) Trapezoidal section with rounded corners for large canals
- (C) Both (a) and (b)
- (D) None of these
4. An outlet is said to be proportional if its flexibility, is
- (A) Zero
- (B) Less than one
- (C) More than one
- (D) One
5. The level of the floor of a syphon aqueduct can be obtained
- (A) By subtracting the depth of the culvert from the canal bed level
- (B) By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level
- (C) Both (a) and (b)
- (D) None of these
6. If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle θ with horizontal, the hydraulic mean depth is
- (A) D
- (B) D/2
- (C) D/3
- (D) D/5
7. According to Bligh's creep theory, percolating water flows along
- (A) Straight path under the foundation of the dam
- (B) Circular path under the foundation of the dam
- (C) The outline of the base of the foundation of the dam
- (D) None of these
8. For a standing crop, the consumptive use of water is equal to the depth of water
- (A) Transpired by the crop
- (B) Evaporated by the crop
- (C) Transpired and evaporated by the crop
- (D) Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil
9. Bed bars in a canal are provided
- (A) To watch the general behavior of canal
- (B) To measure the discharge
- (C) To raise the supply level
- (D) To control the silting
10. The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to
- (A) 1 to 2 m per second
- (B) 2 to 3 m per second
- (C) 3 to 4 m per second
- (D) 4 to 5 m per second
11. For the design of major hydraulic structures on the canals, the method generally preferred to, is based on
- (A) Bligh's theory
- (B) Electrical analogy method
- (C) The relaxation method
- (D) Khosla's method of independent variables
12. Pick up the incorrect statement from the following:
- (A) In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area
- (B) In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
- (C) In furrow irrigation water is admitted between the rows of plants in the field
- (D) None of these
13. Pick up the incorrect statement from the following
- (A) Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
- (B) Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
- (C) Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
- (D) None of these
14. Irrigation canals are generally aligned along
- (A) Ridge line
- (B) Contour line
- (C) Valley line
- (D) Straight line
15. In a canal syphon, the flow is
- (A) Under atmospheric pressure
- (B) Pipe flow
- (C) With critical velocity
- (D) Under negative pressure