Docks and Harbour Engineering Theory Practice - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. A lead line or sounding line
(A) Is stretched thoroughly when wet before it is graduated
(B) Should be soaked in water for about one hour prior to taking soundings
(C) Is adjusted at regular interval
(D) All the above

2. The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ1 and θ2. The distances AB = L1 and BC = L2. For calculating the angle α2 at C between the boat and station B is obtained by using the following formula: where (β is horizontal angle between A and C at B).
(A) (sin α1/sin α2) = (L2 sin θ1/L1 sin θ2) = K
(B) αt tan α2 = 360° - (θ1 + θ2 + β) = φ
(C) tan α2 = sin φ/(K + cos φ)
(D) All the above

3. For location of soundings a range and one angle from the shore involves the following operations. Which one is correct?
(A) A range line is established
(B) The first and the last soundings and every tenth soundings are fixed by angular observations
(C) The intermediate soundings are fixed by the time intervals
(D) All the above

4. Location of soundings by two angles from the shore requires establishing
(A) One range line parallel to shore
(B) One range line perpendicular to shore
(C) Two range lines mutually perpendicular
(D) No range line

5. Pick up the correct statement from the following:
(A) The direction of the littoral drift depends upon the direction of the wave with respect to the coastline
(B) The direction of a river opening to the sea determines the direction of no littoral drift
(C) Harbour in the path of littoral drift is not constructed to avoid a build up of sand on one side and erosion on the other
(D) All of the above

6. The heaviest line is used to democrat
(A) The low water line
(B) The high water line
(C) The limit of swamps
(D) The direction of current

7. On a hydrographic map, the following feature is shown:
(A) High and low water lines
(B) Depth contours
(C) Land and water areas
(D) All the above

8. Pick up the incorrect statement from the following:
(A) As a wave of sea water approaches the coast line, it is generally accompanied by a drift of water in the direction of wave advance
(B) The on-shore wind helps to produce wave action as well as rise of M.S.L.
(C) A falling hydraulic gradient occurs in the direction of the wave
(D) The wave while receding carries finer particles out to deep water

9. On the sea shore structures, the water wave impact causes
(A) Direct compressive force due to its horizontal component
(B) Shear force due to deflected vertical force
(C) Compressive force due to collapse of the wave
(D) All of the above

10. According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for passenger vessels is:
(A) 7.25 to 1
(B) 7.80 to 1
(C) 8.11 to 1
(D) 8.44 to 1

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