Quiznetik

Dock and Harbour Engineering | Set 1

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

A. When the dock is empty

B. When the dock is empty with the ship of maximum tonnage

C. When the dock is full of water

D. When the dock is dry and is under construction

Correct : C. When the dock is full of water

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

A. Sea walls, bulk heads and groynes

B. Sea walls, bulk heads and revetments

C. Sea walls, revetments and groynes

D. Bulk heads, revetments and groynes

Correct : B. Sea walls, bulk heads and revetments

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

A. Two points

B. Four points

C. Six points

D. Eight points

Correct : B. Four points

4. As compared to wall type breakwater, mound type breakwater

A. Requires skilled labour

B. Requires low maintenance cost

C. Requires less material

D. Results in less damage due to gradual failure

Correct : D. Results in less damage due to gradual failure

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

A. Manoeuvring lane + (2 × Bank clearance lane)

B. (2 × Manoeuvring lane) + (2 × Bank clearance lane)

C. (2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)

D. Manoeuvring lane + (2 × Bank clearance lane) + ship clearance lane

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

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

A. The length of design vessel

B. The length of design vessel + 10% clearance between adjacent vessels

C. The length of design vessel + 20% clearance between adjacent vessels

D. Twice the length of design vessel

Correct : C. The length of design vessel + 20% clearance between adjacent vessels

7. A ship strikes the berth generally at an angle

A. 90° with the face of the dock

B. 45° with the face of the dock

C. 30° with the face of the dock

D. 10° with the face of the dock

Correct : D. 10° with the face of the dock

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

A. Mean range

B. Maximum range

C. Maximum rise

D. Mean rise

Correct : B. Maximum range

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

A. Beam

B. Depth

C. Freeboard

D. Draft

Correct : D. Draft

10. By increasing the rise of lock-gates, (i) The length of the lock gate will increase (ii) Transverse stress due to water pressure on the gate will increase (iii) Compressive force on the gate will increase Of these statements

A. (i) and (ii) are correct

B. (i) and (iii) are correct

C. Only (ii) is correct

D. Only (iii) is correct

Correct : A. (i) and (ii) are correct

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

A. 5/8

B. 3/8

C. 3/16

D. 5/16

Correct : A. 5/8

12. 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

A. Surf

B. Clapotis

C. Fetch

D. Swell

Correct : B. Clapotis

13. Select the incorrect statement.

A. The progress of work in low level method of mound construction is very slow

B. Barge method of mound construction is economical

C. In low level method of mound construction, the area of working is limited

D. In staging method of mound construction, the work is not interrupted even during stormy weather

Correct : B. Barge method of mound construction is economical

14. Pick up the correct statement from the following:

A. The regular periodic rise and fall of the surface of the sea, is called tide

B. The average difference in water level between high tide and low tide at a place, is called tidal range

C. The movement of water caused by the action of tide, is called a tidal current

D. all of the above

Correct : D. all of the above

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

A. One-third highest waves

B. One-fourth highest waves

C. One-fifth highest waves

D. One-tenth highest waves

Correct : A. One-third highest waves

16. The fixed mooring does not require

A. Mooring post

B. Bollard

C. Anchors

D. Capstan

Correct : C. Anchors

17. A ship is berthed in a chamber and lifted by principles of buoyancy, such a chamber is called.

A. Dry dock

B. Wet dock

C. Floating dock

D. Refuge dock

Correct : C. Floating dock

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

A. Hydrostatic pressure coupled with a strong momentary impact is caused

B. Vibrations are subjected

C. Internal pressure is developed

D. All of the above

Correct : D. All of the above

19. Assertion A: Intervention of undulations in the sea bed reduces the depth of wave at the section. Reason R: No wave can have a height greater than the depth of water through which it passes Select your answer based on the coding system given below:

A. Both A and R is true and R is correct explanation of A

B. Both A and R is true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

Correct : A. Both A and R is true and R is correct explanation of A

20. Surf zone is:

A. The fathom line of 10 m depth

B. The fathom line of 5 m depth

C. The swell of the sea breaking on the shore or reefs

D. The coast line attacked by the waves

Correct : C. The swell of the sea breaking on the shore or reefs

21. Assertion A: Basin walls have to be of much greater height than dock walls. Reason R: Tidal basins are subject to fluctuations of levels due to tidal variations Select your answer based on the coding system given below:

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not correct explanation of A

C. A is true but R is false

D. A is false but R is true

Correct : A. Both A and R is true and R is the correct explanation of A

22. Pick up the correct statement from the following:

A. A harbour without any port complex, is called a refuge harbour

B. A harbour used for fishery, is called fishery harbour

C. The terminal building of a commercial harbour consists of an administrative block, customs clearance and ware-houses

D. All the above

Correct : D. All the above

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

A. Groynes

B. Sea walls

C. Revetments

D. Moles

Correct : A. Groynes

24. The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be (L is the length of the ship)

A. L

B. 1.5 L

C. 2.0 L

D. 4.0 L

Correct : D. 4.0 L

25. Pick up the correct statement from the following:

A. The maritime structures should be designed to withstand wave motion of air

B. The wind vortex results in conical depression in the air surface

C. A tube of air rotating at hundreds of kilometres per hour forms a tornado

D. all of the above

Correct : D. all of the above

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

A. 2.073 m

B. 8.169 m

C. 9.144 m

D. 6.8 m

Correct : C. 9.144 m

27. Pick up the correct statement from the following:

A. Spring tides are caused at new and full moon

B. Neap tides are caused when the moon is in her quarters

C. Spring tides are roughly twice the height of neap tides

D. All of the above

Correct : D. All of the above

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

A. Bollard

B. Buoys

C. Cables

D. Anchors

Correct : A. Bollard

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

A. 5.5 and 6.0 to 1

B. 6.2 and 6.8 to 1

C. 7.4 and 7.8 to 1

D. 8.2 and 8.5 to 1

Correct : C. 7.4 and 7.8 to 1

30. Consider the following statements. (i) Fender is the cushion provided on the face of the jetty for ships to come in contact, (ii) Slip is the space of water area between two adjacent piers where ships are berthed, (iii) Pier head is a structure constructed near the tip of break water near the harbour entrance. Of the statements

A. (i) and (ii) are correct

B. (ii) and (iii) are correct

C. (i) and (iii) are correct

D. (i), (ii) and (iii) are correct

Correct : D. (i), (ii) and (iii) are correct

31. Pick up the correct statement from the following:

A. For nautical purposes, low water level is generally referred to by the navigators

B. The depth of the bed of the sea from the surface of water is called sounding

C. The contour lines on the bed of a water body are called fathoms

D. All the above

Correct : D. All the above

32. The maximum harbour depth below lowest low water is generally equal to (i) Loaded draft +1.2 m when bottom is rock (ii) Loaded draft +1.8 m when bottom is soft (iii) Loaded draft +1.2 m when bottom is soft (iv) Loaded draft +1.8 m when bottom is rock Of these statements

A. (i) and (ii) are correct

B. (i) and (iii) are correct

C. (ii) and (iv) are correct

D. (iii) and (iv) are correct

Correct : D. (iii) and (iv) are correct

33. Which one of the following statements is correct?

A. The soundings are made with respect to the mean low water

B. The soundings which are below the datum are written in black on the map

C. The spot heights of the features above datum are written in red on the map

D. All the above

Correct : D. All the above

34. Which of the following are repair docks?

A. Marine railways, dry docks, floating docks, wet docks

B. Dry docks, wet docks, floating docks, lift docks

C. Wet docks, floating docks, lift docks, marine railways

D. Wet docks, lift docks, marine railways, dry docks

Correct : C. Wet docks, floating docks, lift docks, marine railways

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

A. Granite stone

B. Timber

C. Steel

D. All the above

Correct : D. All the above

36. Assertion A: Depth and width required at the entrance to a harbour are more than those required in the channel. Reason R: The entrance to a harbour is usually more exposed to waves as compared to the harbour itself. Select your answer based on the coding system given below:

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

Correct : A. Both A and R is true and R is the correct explanation of A

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

A. Spacing of the blocks is 1.35 m

B. The lowest block is 1.8 m long 40 cm × 40 cm in cross-section

C. The middle block is 1.6 m long 40 cm × 40 cm in cross-section

D. None of these

Correct : D. None of these

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

A. Bow line

B. Stern line

C. Spring line

D. All of these

Correct : D. All of these

39. In a wet dock system,

A. Minimum required depth of water for the vessels is maintained

B. Entrance locks are provided with massive gates

C. The cost of construction is quite heavy

D. All the above

Correct : D. All the above

40. Assertion A: Marine structures are made specially bulky and strong. Reason R: Sea insects result in undermining of the hardest and the soundest building material Select your answer based on the coding system given below:

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

Correct : A. Both A and R is true and R is the correct explanation of A

41. A dock:

A. Is a marine structure for berthing of vessels for loading and unloading cargo and passengers

B. Is provided with a dock gate

C. Is provided with an arrangement to pump out water when required

D. All the above

Correct : D. All the above

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

A. Vertical sea wall

B. Sea wall with batter

C. Stepped sea wall

D. Sea wall with concave face

Correct : D. Sea wall with concave face

43. Pick up the correct statement from the following:

A. An artificial barrier which makes the enclosed area safe for anchorage of ships, is known as break water

B. The break water whose inside is used as a platform for loading and unloading is called a mole

C. The length of the quay wall is governed by the length of the largest vessel likely to be berthed

D. All the above

Correct : D. All the above

44. 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

A. 2.5 m

B. 4 m

C. 5 m

D. 7 m

Correct : D. 7 m

45. Pick up the correct statement function following:

A. The coarse material which has a smaller angle of repose, causes a steeper beach slope

B. The coarse material which has a greater angle of repose, causes a steeper beach slope

C. The flattening out of the beach is caused due to the movement of small and uniform particles leeward

D. Both (b) and (c)

Correct : D. Both (b) and (c)

46. Consider the following statements in regard to Beaufort scale for wind speeds, (i) The Beaufort number ranges from 1 to 12. (ii) Higher Beaufort number indicates higher speed of wind, (iii) Beaufort number for calm is smallest and for hurricane is highest Of these statements

A. (i) and (ii) are correct

B. (ii) and (iii) are correct

C. (i) and (iii) are correct

D. (i), (ii) and (iii) are correct

Correct : B. (ii) and (iii) are correct

47. The shore line survey includes:

A. Depicting the shore line

B. Depicting the prominent details on shore line

C. Depicting the high water line

D. All the above

Correct : D. All the above

48. A harbour is a place where

A. Ships get shelter and protection against destructive forces due to sea waves

B. Facilities are provided for receiving cargo and passengers

C. Port buildings are constructed for commercial purposes

D. All of the above

Correct : D. All of the above

49. Assertion A: Large size stones are required in stone revetment in shore protection. Reason R: Resistance of stone to wave force is proportional to its volume and wave force is proportional to the exposed area of the stone. Select your answer based on the coding system given below.

A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

Correct : A. Both A and R is true and R is the correct explanation of A

50. A roadstead:

A. Is a protected area of water where boats can move safely

B. Is the end of the road at the harbour

C. May be protected by break water walls

D. None of these

Correct : A. Is a protected area of water where boats can move safely

51. In tropical regions,

A. The surface gets heated more effectively than the arctic areas

B. After heating, the air becomes lighter and is displaced by cool air from the polar regions

C. The rising tropical air flows towards the polar region in the upper strata

D. All of the above

Correct : D. All of the above

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

A. Cylindrical shape

B. Pear shaped

C. Spherical shape

D. All of these

Correct : D. All of these

53. Dead weight tonnage of a ship (i) Varies with latitude and season (ii) Is more than displacement tonnage (iii) Is the difference between displacement load and displacement light Of these statements

A. i) and ii) are correct

B. ii) and iii) are correct

C. i) and iii) are correct

D. Only iii) is correct

Correct : C. i) and iii) are correct

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

A. 100 m

B. 125 m

C. 150 m

D. 180 m

Correct : D. 180 m

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

A. 1.2 H to 1.25 H above the datum

B. 1.2 H to 1.25 H above the low water level

C. 1.2 H to 1.25 H above the high water level

D. 1.2 H to 1.25 H above the mean sea level

Correct : C. 1.2 H to 1.25 H above the high water level

56. Littoral drift

A. Is the raised line of sand, parallel to the sea coast

B. Is the slow movement of surface water at sea caused by the wind

C. Is a current parallel to the shore, caused due to tangential component of the wind

D. Is a current perpendicular to the shore line caused due to wind

Correct : C. Is a current parallel to the shore, caused due to tangential component of the wind

57. Which one of the following statements is not relevant to hydrographic survey?

A. Establishment of a chain of bench marks near the shore line

B. Establishment of horizontal control points on the shore

C. Determination of the sea bed profile

D. None of these

Correct : D. None of these

58. Pick up the correct statement from the following:

A. The breakwater which can be used as a platform for loading and unloading of cargo is called a mole

B. The brick masonry retaining wall which is used for loading and unloading of cargo is called quay wall

C. Three types of break waters are generally provided in harbours

D. All of the above

Correct : D. All of the above

59. Pick up the correct statement from the following:

A. The Mediterranean Sea is considered to be a huge harbour

B. The Caspian Sea is considered to be a big harbour

C. The Red sea is considered to be harbour

D. None of the above

Correct : A. The Mediterranean Sea is considered to be a huge harbour

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

A. One legged mooring

B. Two legged mooring

C. Three legged mooring

D. All the types as above

Correct : D. All the types as above

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

A. The sum of elevation

B. Pressure head

C. Velocity head

D. All of the above

Correct : D. All of the above

62. 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

Correct : D. All the above