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MCQs

Total Questions : 242 | Page 2 of 25 pages
Question 11. For designing the dock, the proportion of ship load assumed to be borne by keel blocks is
  1.    5/8
  2.    3/8
  3.    3/16
  4.    5/16
 Discuss Question
Answer: Option A. -> 5/8
Question 12. As compared to wall type breakwater, mound type breakwater
  1.    Requires skilled labor
  2.    Requires low maintenance cost
  3.    Requires less material
  4.    Results in less damage due to gradual failure
 Discuss Question
Answer: Option D. -> Results in less damage due to gradual failure
Question 13. 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
  1.    (i) and (ii) are correct
  2.    (i) and (iii) are correct
  3.    (ii) and (iv) are correct
  4.    (iii) and (iv) are correct
 Discuss Question
Answer: Option D. -> (iii) and (iv) are correct
Question 14. If H is the height of the wave expected, then the height of the breakwater is generally taken as
  1.    1.2 H to 1.25 H above the datum
  2.    1.2 H to 1.25 H above the low water level
  3.    1.2 H to 1.25 H above the high water level
  4.    1.2 H to 1.25 H above the mean sea level
 Discuss Question
Answer: Option C. -> 1.2 H to 1.25 H above the high water level
Question 15. Which of the following structures protects the shore by trapping of littoral drift?
  1.    groynes
  2.    sea walls
  3.    revetments
  4.    moles
 Discuss Question
Answer: Option A. -> groynes
Question 16. A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called.
  1.    Dry dock
  2.    Wet dock
  3.    Floating dock
  4.    Refuge dock
 Discuss Question
Answer: Option C. -> Floating dock
Question 17. Minimum width of ship clearance shall be (where “B” is beam of the design vessel)
  1.    B or 30 m
  2.    1.5 B or 50 m
  3.    1.5 B
  4.    50 m
 Discuss Question
Answer: Option A. -> B or 30 m
Question 18. As per Berlin's formula, the length of wave in meters is given by(Where ’t’ is the period in seconds for two successive waves to pass the same section.)
  1.    1.3412
  2.    1.5612
  3.    1.7412
  4.    1.9412
 Discuss Question
Answer: Option B. -> 1.5612
Question 19. The most popular method of construction of wall breakwaters is
  1.    Barge method
  2.    Staging method
  3.    Low level method
  4.    none of the above
 Discuss Question
Answer: Option B. -> Staging method
Question 20. 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
 Discuss Question
Answer: Option B. -> Clapotis

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