Docks and Harbour Engineering

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

  1. 7.25 to 1
  2. 7.80 to 1
  3. 8.11 to 1
  4. 8.44 to 1

Correct answer: (D)
8.44 to 1

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

  1. Requires skilled labour
  2. Requires low maintenance cost
  3. Requires less material
  4. Results in less damage due to gradual failure

Correct answer: (D)
Results in less damage due to gradual failure

13. As per Berlin's formula, the length of wave in metres is given by (Where 't' is the period in soconds for two successive waves to pass the same section.)

  1. 1.3412
  2. 1.5612
  3. 1.7412
  4. 1.9412

Correct answer: (B)
1.5612

14. As per Stevenson's empirical formula, the approximate value of the height of the wave in metres is given by

  1. 0.34 VF
  2. 0.5 VF
  3. 1.5 VF
  4. 3.4 VF
    Where 'F' is the fetch in km

Correct answer: (A)
0.34 VF

15. 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:

  1. Both A and R is true and R is the correct explanation of A
  2. Both A and R is true but R is not correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Correct answer: (A)
Both A and R is true and R is the correct explanation of A

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.
Select your answer based on the coding system given below:

  1. Both A and R is true and R is the correct explanation of A
  2. Both A and R is true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Correct answer: (A)
Both A and R is true and R is the correct explanation of A

17. 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:

  1. Both A and R is true and R is correct explanation of A
  2. Both A and R is true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Correct answer: (A)
Both A and R is true and R is correct explanation of A

18. 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.

  1. Both A and R is true and R is the correct explanation of A
  2. Both A and R is true but R is not a correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Correct answer: (A)
Both A and R is true and R is the correct explanation of A

19. 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:

  1. Both A and R is true and R is the correct explanation of A
  2. Both A and R is true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Correct answer: (A)
Both A and R is true and R is the correct explanation of A

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

  1. 2.073 m
  2. 8.169 m
  3. 9.144 m
  4. 6.8 m

Correct answer: (C)
9.144 m

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