Docks and Harbour Engineering

71. The width of the entrances of the harbours is restricted to

  1. 100 m
  2. 125 m
  3. 150 m
  4. 180 m

Correct answer: (D)
180 m

72. When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as

  1. Beam
  2. Depth
  3. Freeboard
  4. Draft

Correct answer: (D)
Draft

73. When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called

  1. Surf
  2. Clapotis
  3. Fetch
  4. Swell

Correct answer: (B)
Clapotis

74. Which of the following are repair docks?

  1. Marine railways, dry docks, floating docks, wet docks
  2. Dry docks, wet docks, floating docks, lift docks
  3. Wet docks, floating docks, lift docks, marine railways
  4. Wet docks, lift docks, marine railways, dry docks

Correct answer: (C)
Wet docks, floating docks, lift docks, marine railways

75. Which of the following conditions of loading imposes the greatest load on the foundation in case of dry docks?

  1. When the dock is empty
  2. When the dock is empty with the ship of maximum tonnage
  3. When the dock is full of water
  4. When the dock is dry and is under construction

Correct answer: (C)
When the dock is full of water

76. Which of the following is a fixed type mooring accessory?

  1. Bollard
  2. Buoys
  3. Cables
  4. Anchors

Correct answer: (A)
Bollard

77. Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area?

  1. Sea walls, bulk heads and groynes
  2. Sea walls, bulk heads and revetments
  3. Sea walls, revetments and groynes
  4. Bulk heads, revetments and groynes

Correct answer: (B)
Sea walls, bulk heads and revetments

78. Which of the following structures protects the shore by trapping of littoral drift?

  1. Groynes
  2. Sea walls
  3. Revetments
  4. Moles

Correct answer: (A)
Groynes

79. Which of the following type of sea walls results in greatest protection of shore structures?

  1. Vertical sea wall
  2. Sea wall with batter
  3. Stepped sea wall
  4. Sea wall with concave face

Correct answer: (D)
Sea wall with concave face

80. Which one of the following land marks on the coast line must be depicted on hydrographic maps?

  1. Shore line
  2. Light houses
  3. Church spires
  4. All the above

Correct answer: (D)
All the above

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