Civil Engineering MCQ on Irrigation - Set 04

Practice Test: Question Set - 04

1. Pick up the correct statement from the following
    (A) Approach of the water line in a flumed channel section should not be steeper than 22½°
    (B) Departure of the water line from a flumed channel section should not be steeper than 30°
    (C) Approach of the water line should not be steeper than 30° and departure line not steeper than 22½° in a flumed channel section
    (D) Approach and departure of the water line in a flumed channel section, should not be steeper than 22½°

2. The main function of a diversion head works of a canal from a river, is
    (A) To remove silt
    (B) To control floods
    (C) To store water
    (D) To raise water level

3. Pick up the correct statement from the following:
    (A) The full supply level of a canal should be above ground level
    (B) According to Lacey, regime conditions require a particular slope for a given discharge and silt factor
    (C) In case the ground slope is less than the required bed slope, the silt factor must be reduced by permitting the entry of coarse silt
    (D) All the above

4. 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
    (A) x = r1 d1
    (B) x = r2 d2
    (C) x = d1 / r1
    (D) x = d2 / r2

5. If V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to
    (A) V01/2
    (B) V03/2
    (C) V05/2
    (D) V07/2

6. Regime conditions in a channel may occur if
    (A) Discharge is constant
    (B) Channel flows uniformly in incoherent alluvium as that transported in suspension
    (C) Silt grade and silt charge are constant
    (D) All the above

7. A river is said to be of
    (A) Aggrading type if it builds up its bed to a certain slope
    (B) Degrading type if it cuts its bed to a certain slope
    (C) Meandering type if it flows in sinuous curve
    (D) All the above

8. The ratio of the rate of change of discharge of an outlet and parent channel, is known as
    (A) Efficiency
    (B) Sensitivity
    (C) Flexibility
    (D) Modular limit

9. The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than
    (A) 10 cm
    (B) 20 cm
    (C) 30 cm
    (D) 40 cm

10. Pick up the correct statement from the following:
    (A) Water table generally follows the ground surface above it with a few exceptions
    (B) Static level of water in an open well indicates the position of the water table
    (C) At water table, hydrostatic pressure is zero
    (D) All the above

11. Lacey's equation for calculating flood discharge in rivers, is
    (A) V = 10.8 R1/2 S1/2
    (B) V = 10.8 R2/3 S1/2
    (C) V = 10.8 R2/3 S1/3
    (D) V = 10.8 R1/3 S2/3

12. A deficit of sediments in flowing water may cause a river
    (A) Meandering type
    (B) Aggrading type
    (C) Degrading type
    (D) Sub-critical type

13. Side slopes generally kept for canals in loam soil, are:
    (A) 1 : 1 in cutting and 1½ : 1 in filling
    (B) 1½ : 1 in cutting and 2 : 1 in filling
    (C) Neither (a) nor (b)
    (D) Both (a) and (b)

14. For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is
    (A) Zero
    (B) 0.25
    (C) 0.50
    (D) 1.00

15. If B and d are the bed width and depth of a channel in meters, the combined losses due to evaporation and seepage in cumecs per kilometer length of the channel, is
    (A) (1/50) × (B + d)2/3
    (B) (1/100) × (B + d)2/3
    (C) (1/150) × (B + d)2/3
    (D) (1/200) × (B + d)2/3

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