Docks and Harbor Engineering MCQ Civil Engineering

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About Docks and Harbor Engineering

Following are some of the multiple choice questions on the Docks and Harbor Engineering with answers that will help the students in developing their knowledge.

Docks and Harbor Engineering MCQ

1. Which of the following are repair docks ?

  • marine railways, dry docks, floating docks, wet docks
  • dry docks, wet docks, floating docks, lift docks
  • wet docks, floating docks, lift docks, marine railways
  • wet docks, lift docks, marine railways, dry docks

2. A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called.

  • Dry dock
  • Wet dock
  • Floating dock
  • Refuge dock

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

  • bollard
  • buoys
  • cables
  • anchors

4. Pick up the correct statement function following:

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

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

  • When the dock is empty
  • When the dock is empty with the ship of maximum tonnage
  • When the dock is full of water
  • When the dock is dry and is under construction

6. The difference in height between highest high water and lowest low water is called

  • Mean range
  • Maximum range
  • Maximum rise
  • Mean rise

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

  • vertical sea wall
  • sea wall with batter
  • stepped sea wall
  • sea wall with concave face

8. A ship strikes the berth generally at an angle

  • 90° with the face of the dock
  • 45° with the face of the dock
  • 30° with the face of the dock
  • 10° with the face of the dock

9. The most popular method of construction of wall breakwaters is

  • Barge method
  • Staging method
  • Low level method
  • none of the above

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

  • groynes
  • sea walls
  • revetments
  • moles

11. The significant wave height is defined is the average height of the

  • one – third highest waves
  • one – fourth highest waves
  • one – fifth highest waves
  • one – tenth highest waves

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

  • Sea walls, bulk heads and groynes
  • Sea walls, bulk heads and revetments
  • Sea walls, revetments and groynes
  • Bulk heads, revetments and groynes

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

  • 100 m
  • 125 m
  • 150 m
  • 180 m

14. In a wet dock system,

  • minimum required depth of water for the vessels is maintained
  • entrance locks are provided with massive gates
  • the locks of dock gate are operated by means of heavy bascule bridges and connected machinery
  • the cost of construction is quite heavy
  • E. all the above.

15. A roadstead :

  • is a protected area of water where boats can move safely
  • is the end of the road at the harbour
  • may be protected by break water walls
  • none of these.

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

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

17. 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

  • 3.86 (h + h1)
  • 3.86 (h - h1)
  • 3.86 (h x h1)
  • 3.86 π (h + h1)

18. Soundings are required for

  • making nautical charts for navigation
  • ascertaining the areas subject to scour or silting
  • obtaining detailed information for construction
  • all the above.

19. Which one of the following lines is used for tying a ship with a dock

  • bow line
  • stern line
  • spring line
  • break line
  • E. all of these.

20. Surf zone is :

  • the fathom line of 10 m depth
  • the fathom line of 5 m depth
  • the swell of the sea breaking on the shore or reefs
  • the coast line attacked by the waves.

21. The dock wall is designed as a gravity retaining wall and is tested for

  • back fill pressure when the dock is empty
  • maximum water pressure from the dock without any back fill
  • the load charge transmitted to the dock by the movement of loaded vehicles or trains on the way
  • all of the above.

22. The shape of docks and basins is generally kept

  • rectangular ways
  • diamond shape quays
  • inclined quays
  • all of these.

23. 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).

  • αt tan α2 = 360° - (θ1 + θ2 + β) = φ
  • all the above.

24. Due to the impact of water wave on a sea shore structure

  • hydrostatic pressure coupled with a strong momentary impact is caused
  • vibrations are subjected
  • internal pressure is developed
  • weakens the foundation
  • E. all of the above.

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

  • datum
  • high and low water lines
  • depth contours
  • land and water areas
  • E. all the above.

26. Pick up the incorrect statement from the following: In a dry dock block made of hard wood,

  • spacing of the blocks is 1.35 m
  • the lowest block is 1.8 m long 40 cm x 40 cm in cross-section
  • the middle block is 1.6 m long 40 cm x 40 cm in crosss-section
  • the top block is 1.2 m long 40 cm x 40 cm in cross-section
  • E. none of these.

27. A harbour is a place where

  • ships get shelter and protection against destructive forces due to sea waves
  • facilities are provided for receiving cargo and passengers
  • port buildings are constructed for commercial purposes
  • all the above.

28. P and Q are two stations on the shore line at distance d. If the angle between Q and the boat O and P is a and the angle between P and Q at boat O is β, the x and y. Coordinate along PQ and perpendicular to PQ from O are :

  • none of the above.

29. The low water datum for a lake is defined as the surface of the lake when it is at elevation

  • 180.5 m above M.S.L.
  • 190.5 m above M.S.L.
  • 170.5 m above M.S.L.
  • 200.0 m above M.S.L.

30. The fixed mooring does not require

  • mooring post
  • bollard
  • anchors
  • capstan.

31. Cretans :

  • are the harbours established on the island south east of Greek mainland
  • are the natives of crete, an island south of Greek mainland
  • are the plants, grown in the neighbourhood of harbours
  • none of the above.

32. The important component of a sea port is

  • terminal buildings
  • the docks
  • the harbour
  • all of these.

33. Which one of the following statements is not relevant to hydrographic survey :

  • establishment of a chain of bench marks near the shore line
  • establishment of horizontal control points on the shore
  • determination of the sea bed profile
  • depicting the irregularities in the shore line, islands and projecting rocks
  • E. none of these.

34. The shore line survey includes :

  • depicting the shore line
  • depicting the prominent details on shore line
  • depicting the high water line
  • depicting the low water line
  • E. all the above.

35. The smoothened surface of the front face of the guay walls, is known as fending which is made of

  • granite stone
  • timber
  • steel
  • all the above.

36. A lead line or sounding line

  • is stretched thoroughly when wet before it is graduated
  • should be soaked in water for about one hour prior to taking soundings
  • is adjusted at regular interval
  • is generally used for depths exceeding 6 m
  • E. all the above.

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

  • shore line
  • light houses
  • church spires
  • all the above.

38. Depth of borings for soil investigation, is generally kept below low water level

  • 30 m
  • 35 m
  • 45 m
  • 40 m

39. The wavelength is computed by Bertin's formula (where T is the period in seconds).

40. Littoral drift

  • is the raised line of sand, parallel to the sea coast
  • is the slow movement of surface water at sea caused by the wind
  • is a current parallel to the shore, caused due to tangential component of the wind
  • is a current perpendicular to the shore line caused due to wind.

41. The heaviest line is used to democrate

  • the low water line
  • the high water line
  • the limit of swamps
  • the direction of current.

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

  • 0.15 F
  • 0.20 F
  • 0.28 F
  • 0.34 F

43. A low wall built out into the sea more or less perpendicular to the coast line, to resist the travel of sand and shingle along a beach, is called

  • break water
  • break wall
  • groins
  • shore wall.

44. At a place the shore line is along North West-South East. The wind is blowing from the north. The littoral drift will be along

  • south east
  • south
  • south west
  • west
  • E. north west

45. Flow of air from one place to the other is caused due to

  • the sum of elevation
  • pressure head
  • velocity head
  • all of the above.

46. According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for cargo vessels is

  • 5.5 and 6.0 to 1
  • 6.2 and 6.8 to 1
  • 7.4 and 7.8 to 1
  • 8.2 and 8.5 to 1

47. Buoys which support the cables to which vessels are attached are of

  • cylindrical shape
  • drum
  • pear shaped
  • spherical shape
  • E. all of these.

48. The beach is built:

  • with largest material locally available to the waves
  • with large material locally available to the waves
  • with fine material locally available to the waves
  • with finest material locally available to the waves.

49. If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by

  • 0.6 Hs and 1.67 Hs
  • 0.6 Hs and 1.87 Hs
  • 1.27 Hs and 1.87 Hs
  • 1.27 Hs and 1.67 Hs

50. At a given port, the fetch is 400 nautical miles, the maximum height of storm wave will be

  • 2.073 m
  • 8.169 m
  • 9.144 m
  • 6.8 m

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