Docks and Harbour Engineering

41. In basins subjected to strong winds and tide, the length of the berthing area should not be less than

1. The length of design vessel
2. The length of design vessel + 10% clearance between adjacent vessels
3. The length of design vessel + 20% clearance between adjacent vessels
4. Twice the length of design vessel

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42. In multiple point mooring system, vessel is secured to minimum of

1. Two points
2. Four points
3. Six points
4. Eight points

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43. Littoral drift

1. Is the raised line of sand, parallel to the sea coast
2. Is the slow movement of surface water at sea caused by the wind
3. Is a current parallel to the shore, caused due to tangential component of the wind
4. Is a current perpendicular to the shore line caused due to wind

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44. Location of soundings by range and one angle is done by the surveyor

1. On the shore
2. On the boat
3. On the shore or on the boat
4. None of the above

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45. Location of soundings by two angles from the shore requires establishing

1. One range line parallel to shore
2. One range line perpendicular to shore
3. Two range lines mutually perpendicular
4. No range line

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46. Minimum width of ship clearance shall be

1. B or 30 m
2. 1.5 B or 50 m
3. 1.5 B
4. 50 m
   Where 'B' is beam of the design vessel

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47. On a hydrographic map, the following feature is shown:

1. High and low water lines
2. Depth contours
3. Land and water areas
4. All the above

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48. On the sea shore structures, the water wave impact causes

1. Direct compressive force due to its horizontal component
2. Shear force due to deflected vertical force
3. Compressive force due to collapse of the wave
4. All of the above

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49. Pick up the correct statement from the following:

1. The regular periodic rise and fall of the surface of the sea, is called tide
2. The average difference in water level between high tide and low tide at a place, is called tidal range
3. The movement of water caused by the action of tide, is called a tidal current
4. all of the above

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50. Pick up the correct statement function following:

1. The coarse material which has a smaller angle of repose, causes a steeper beach slope
2. The coarse material which has a greater angle of repose, causes a steeper beach slope
3. The flattening out of the beach is caused due to the movement of small and uniform particles leeward
4. Both (b) and (c)

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