### Questions set civil engineering part - 7 for ssc je.

1. To form still water pocket in front of canal head, following is constructed :
(b) Divide wall
(c) Dam
(d) None of the above

2. When an irrigation canal passes over a river, the structure constructed is called
(a) cross drainage
(b) Aqueduct
(c) Super passage
(d) Level crossing

3. Garret diagram, for the design of irrigation channels, is based on
(a) Kennedy’s Theory
(b) Lacey’s theory
(c) Kutter’s formula
(d) Manning’s formula

4. For an open channel, Chezy’s formula is (symbol’s have their usual meanings)
(a) V = √CRS
(b) V = C √RS
(c) V = CRS
(d) V = C/ √RS

5. The water surface slope dy/dx, in case of uniform flow in the channel, is equal to
(a) 0                 (b) 1
(c) 1000           (d) ∞

6. The sequent depth ratio of a hydraulic jump in a rectangular horizontal channel is 10.30. The Froude number at the beginning of the jump is
(a) 5.64          (b) 7.63
(c) 8.05          (d) 13.61

7. The critical depth at a section of a rectangular channel is 1.5 m. The specific energy at that
section is
(a) 0.75 m।      (b) 1.00 m
(c) 1.50 m।      (d) 2.25 m

8. A rectangular open channel of width 5.0 m is carrying a discharge of 100 m3/s. The Froude number of the flow is 0.80. The depth of flow in the channel is
(a) 4 m             (b) 8 m
(c) 16 m           (d) 20 m

9. If ‘D’ is the scour depth measured below the high flood level and ‘d’is the depth of scour below the original bed level, then the width of the launching apron at toe of the guide bank will generally be
(a) 1.5 D             (b) 1.5 d
(c) 2.0 D              (d) 2.0 d

10. According to Khosla’s theory, which one of the following is correct ?
(a) The critical hydraulic gradient for alluvial soil is nearly equal to 2.0
(b) The undermining of floor starts from intermediate point
(c) Both (a) & (b)
(d) None of the above

11. Specific capacity of an open well is higher for which of the following soil type ?
(a) Clay (b) Fine sand
(c) Coarse sand (d) Rock

12. Discharge ‘Q’ over an ogee spillway is given by (where symbols have their usual meanings)
(a) Q = CLH         (b) Q = CLH3/2
(c) Q = CL3/2 H   (d) Q = C √LH

13. Flow in pipe is laminar if Reynold’s number is
(a) more than 2100
(b) more than 3000
(c) more than 4000
(d) less than 2000

14. The concept of boundary layer was first introduced by
(a) Prandtl            (b) Newton
(c) Reynolds         (d) Kutter

15. The major resisting force in a gravity dam is
(a) water pressure
(b) wave pressure
(c) self weight of dam
(d) uplift pressure

16. There will be no tension in dam if the resultant passes through the
(a) last third of the base
(b) middle third of the base
(c) middle two third of the base
(d) none of the above

17. The relation between duty ‘D’ in hect/m3/sec, delta ‘∆’ in m and base period ‘B’ in days is
(a) ∆ = 8.64 D/B
(b) B = 8.64 ∆/D
(c) D = 8.64 ∆/B
(d) ∆ = 8.64 B/D

18. According to Lacey, the scour depth is given by : (Q – discharge in m3/sec and f-Lacey’s factor)
(a) 0.47 (Q/f)½
(b) 0.47 (Q/f)1/3
(c) 0.47 (Q/f)1/4
(d) 0.47 (Q/f)1/5

19. Lacey’s regime velocity is proportional to :Where, R – Hydraulic mean radius in m  S – slope
(a) R1/2 S3/4         (b) R3/4 S1/2
(c) R3/4 S1/3         (d) R2/3 S1/2

20. Due to rise in temperature, the viscosity and unit weight of the percolating fluid are reduced to 70% and 90% respectively. Other things being constant, the change in the
coefficient of permeability will be
(a) 20%           (b) 28.6%
(c) 63.0%        (d) 77.8%

21. For laminar flow in a pipe carrying a given discharge, the height of surface roughness is doubled. In such a case the Darcy-Weisback friction factor will
(a) remain unchanged
(b) be halved
(c) be doubled
(d) increase four hold

22. Which one of the following pressure units represents the least pressure ?
(a) Millibar
(b) mm of Mercury
(c) N/mm2
(d) kgf/cm2

23. The correct sequence in the direction of the flow of water for installation of Hydropower plant is
(a) Reservoir, surge tank, turbine, penstock
(b) Reservoir, penstock, surge tank, turbine
(c) Reservoir, penstock, turbine, surge tank
(d) Reservoir, surge tank, penstock, turbine

24. The yield of well depends upon
(a) permeability of soil
(b) area of aquifer opening into the well
(c) actual flow velocity
(d) All the above

25. The ratio of the rate of change of discharge in an irrigation outlet to the rate of change of discharge of the distributory is known as
(a) Sensitivity
(b) Modular ratio
(c) Flexibility
(d) Setting

26. At a certain point in the floor of the weir, the uplift pressure head due to seepage is 3.75 m. If the relative density of the concrete is 2.5, the minimum thickness of the floor required at this point to counter act the uplift pressure is
(a) 3.75 m           (b) 2.5 m
(c) 1.5 m             (d) 1.25 m

27. The total number of possible GVF profiles in open channel are
(a) 12                 (b) 11
(c) 9                   (d) 15

28. In the design of hydraulic structures in alluvial rivers, the equation used to calculate the
normal depth of scour ‘R’ for a discharge intensity ‘q’ per m width is
(a) R = 4.75 q1/2
(b) R = 1.35 (q/f)2/3
(c) R = 1.35 (q2/f)1/3
(d) R = 1.2 (q2/g)1/3

29. A cross drainage work is termed as a canal syphon if it carries the canal
(a) below the drainage and the canal FSL is more than the bed level of the drain
(b) above the drainage and the drainage HFL is above the bed level of the canal
(c) below the drainage and the canal FSL is below the bed level of the drain
(d) above the drainage and the drainage HFL is below the bed level of the canal

30. The characteristic feature of a barrage is
(a) the provision of a raised crest across the river for flow regulation
(b) the provision of a series of gates across the river for flow regulation
(c) the creation of storage reservoir on the u/s side
(d) none of the above

31. Provision of a filter and a rock toe in an earthen dam is done to
(a) prevent the piping action in the dam section
(b) collection and drain out the seepage water out of dam
(c) reduce the quantity of seepage
(d) none of the above

32. The discharge per unit draw down at a well is known as
(a) specific yield
(b) specific capacity
(c) safe yield
(d) specific storage

33. At the foot of a spillway, the jump rating curve is below the tail water curve at low flows and above it at high flows. The suitable type of energy dissipater for this situation is
(a) a sky-jump bucket
(b) a horizontal apron
(c) a sloping apron
(d) a stilling pool
By Rk Maurya
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