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dock and harbor engineering MCQs

Practise focused dock and harbor engineering questions with marked answers for exam preparation and subject revision.

dock and harbor engineering Mcqs
1. The maximum harbour depth below lowest low water is generally equal to_________________?
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A. i) loaded draft + 1.2 m when bottom is soft

B. ) loaded draft + 1.8 m when bottom is soft

C. ) loaded draft + 1.8 m when bottom is rock</strong>

D. loaded draft + 1.2 m when bottom is rock
2. Select the incorrect statement ?
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A. In low level method of mound construction, the area of working is limited.

B. In staging method of mound cons-truction, the work is not interrupted even during stormy weather

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

D. Barge method of mound construction is economical.
3. The difference in height between highest high water and lowest low water is called_______________?
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A. mean range

B. maximum rise

C. mean rise

D. maximum range
4. As per Berlins formula, the length of wave in metres is given by_______________?
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A. 1.9412

B. 1.7412

C. 1.5612

D. 1.3412

5. In multiple point mooring system, vessel is secured to minimum of____________________?
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A. eight points

B. two points

C. six points

D. four points
6. If Hs is the significant wave height, then the average wave height and highest wave height respectively are given by_______________?
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A. 1.27 Hs and 1.67 Hs

B. 1.27 Hs and 1.87 Hs

C. 0.6 Hs and 1.87 Hs

D. 0.6 Hs and 1.67 Hs

7. Dead weight tonnage of a ship_______________?
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A. ect the correct statemens.

B. ) is the difference between displacement load and displacement light</strong>

C. varies with latitude and season

D. is more than displacement tonnage

8. 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?
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A. ect your answer based on the coding system given below

9. Which of the following conditions of loading imposes the greatest load on the foundation in case of dry docks?
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A. when the dock is full of water

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

C. when the dock is empty

D. when the dock is dry and is under construction

10. A ship strikes the berth generally at an angle_________________?
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A. 10 with the face of the dock

B. 90 with the face of the dock

C. 45 with the face of the dock

D. 30 with the face of the dock

11. In basins subjected to strong winds and tide, the length of the berthing area should not be less than____________________?
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A. the length of design vessel + 20% clearance between adjacent vessels

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

C. the length of design vessel

D. twice the length of design vessel

12. By increasing the rise of lockgates_______________?
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A. the length of the lock gate will increase

B. i) compressive force on the gate will increase </strong>

C. ect the correct statements?

D. ) transverse stress due to water pressure on the gate will increase

13. A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called_________________?
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A. Refuge dock

B. Wet dock

C. Dry dock

D. Floating dock
14. 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?
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A. ect your answer based on the coding system given below?

15. Which of the following are repair docks ?
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A. wet docks, floating docks, lift docks, marine railways

B. dry docks, wet docks, floating docks, lift docks

C. wet docks, lift docks, marine railways, dry docks

D. marine railways, dry docks, floating docks, wet docks

16. 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__________________?
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A. ect your answer based on the coding system given below.

17. The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be___________________?
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A. 1.5 L

B. 2.0 L

C. L

D. 4.0 L
18. Consider the following statements in regard to Beaufort scale for wind speeds______________?
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A. ) Higher Beaufort number indicates higher speed of wind,

B. i) Beaufort number for calm is smallest and for hurricane is highest </strong>

C. The Beaufort number ranges from 1 to 12.

D. ect the correct statments.

19. When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as________________?
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A. draft

B. freeboard

C. depth

D. beam

20. For designing the dock, the proportion of ship load assumed to be borne by keel blocks is________________?
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A. 16-May

B. 5/8

C. 8-Mar

D. 16-Mar

21. If H is the height of the wave expected, then the height of the breakwater is generally taken as______________________?
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A. 1.2 H to 1.25 H above the low water level

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

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

D. 1.2 H to 1.25 H above the datum

22. In a two lane channel, bottom width of channel is given by_______________?
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A. 2 x Manoeuvring lane + 2 x Bank clearance lane + ship clearance lane

B. Manoeuvring lane + 2 x Bank clearance lane

C. Manoeuvring lane + 2 x Bank clearance lane + ship clearance lane

D. 2 x Manoeuvring lane + 2 x Bank clearance lane

23. Consider the following statements?
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A. ) Slip is the space of water area between two adjacent piers where ships are berthed,

B. ect the correct statements?

C. ="color: #003f1a;">(i) Fender is the cushion provided on the face of the jetty for ships to come in contact,

D. i) Pier head is a structure constructed near the tip of a break water near the harbour entrance.</strong></span>

24. Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area ?
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A. sea walls, bulk heads and groynes

B. bulk heads, revetments and groynes

C. sea walls, bulk heads and revetments

D. sea walls, revetments and groynes

25. Which of the following structures protects the shore by trapping of littoral drift?
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A. groynes

B. moles

C. sea walls

D. revetments

26. Which of the following type of sea walls results in greatest protection of shore structures?
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A. stepped sea wall

B. vertical sea wall

C. sea wall with concave face

D. sea wall with batter

27. 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_________________?
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A. 5 m

B. 7 m

C. 2.5 m

D. 4 m

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

29. At a given port, the fetch is 400 nautical miles, the maximum height of storm wave will be_______________?
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A. 8.169 m

B. 2.073 m

C. 6.8 m

D. 9.144 m
30. The significant wave height is defined is the average height of the_________________?
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A. one fourth highest waves

B. one third highest waves

C. one tenth highest waves

D. one fifth highest waves

31. Minimum width of ship clearance shall be__________________?
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A. 50 m

B. 1.5 B or 50 m

C. 1.5 B

D. B or 30 m
32. As compared to wall type breakwater, mound type breakwater_________________?
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A. requires less material

B. requires low maintenance cost

C. results in less damage due to gradual failure

D. requires skilled labour

33. Which of the following is a fixed type mooring accessory ?
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A. bollard

B. cables

C. anchors

D. buoys

34. 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_________________?
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A. Fetch

B. Clapotis

C. Surf

D. Swell

35. As per Stevensons empirical formula, the approximate value of the height of the wave in metres is given by__________________?
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A. 1.5 VF

B. 3.4 VF

C. 0.34 VF

D. re F is the fetch in km

E. 0.5 VF