Docks and Harbour Engineering

31. For designing the dock, the proportion of ship load assumed to be borne by keel blocks is

  1. 43682
  2. 43680
  3. 42430
  4. 42491

Correct answer: (A)
43682

32. For large vessels, the buoys are strengthened by connecting it to a number of anchors having

  1. One legged mooring
  2. Two legged mooring
  3. Three legged mooring
  4. All the types as above

Correct answer: (D)
All the types as above

33. For location of soundings a range and one angle from the shore involves the following operations. Which one is correct?

  1. A range line is established
  2. The first and the last soundings and every tenth soundings are fixed by angular observations
  3. The intermediate soundings are fixed by the time intervals
  4. All the above

Correct answer: (D)
All the above

34. If F is the fetch, the straight line distance of open water available in kilometres, the height of the wave in metres is

  1. 0.15 √F
  2. 0.20 √F
  3. 0.28 √F
  4. 0.34 √F

Correct answer: (D)
0.34 √F

35. If h and h1 are the heights of a light house and the observer in a ship in metres above M S L then the horizontal distance from the ship to the light house in kilometres is

  1. 3.86 (√h + √h1)
  2. 3.86 (√h - √h1)
  3. 3.86 (√h × √h1)
  4. 3.86 (√h + √h1)

Correct answer: (A)
3.86 (√h + √h1)

36. If H is the height of the wave expected, then the height of the breakwater is generally taken as

  1. 1.2 H to 1.25 H above the datum
  2. 1.2 H to 1.25 H above the low water level
  3. 1.2 H to 1.25 H above the high water level
  4. 1.2 H to 1.25 H above the mean sea level

Correct answer: (C)
1.2 H to 1.25 H above the high water level

37. If 'Hs' is the significant wave height, then the average wave height and heighest wave height respectively are given by

  1. 0.6 Hs and 1.67 Hs
  2. 0.6 Hs and 1.87 Hs
  3. 1.27 Hs and 1.87 Hs
  4. 1.27 Hs and 1.67 Hs

Correct answer: (B)
0.6 Hs and 1.87 Hs

38. If the maximum spring rise is 2 m and height of the waves expected is 4 m , then the breakwater height above the datum will be

  1. 2.5 m
  2. 4 m
  3. 5 m
  4. 7 m

Correct answer: (D)
7 m

39. In a two lane channel, bottom width of channel is given by

  1. Manoeuvring lane + (2 × Bank clearance lane)
  2. (2 × Manoeuvring lane) + (2 × Bank clearance lane)
  3. (2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)
  4. Manoeuvring lane + (2 × Bank clearance lane) + ship clearance lane

Correct answer: (C)
(2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)

40. In a wet dock system,

  1. Minimum required depth of water for the vessels is maintained
  2. Entrance locks are provided with massive gates
  3. The cost of construction is quite heavy
  4. All the above

Correct answer: (D)
All the above

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