Docks And Harbor Engineering(Civil Engineering ) Questions and Answers

Question 1. In basins subjected to strong winds and tide, the length of the berthing area should not be less than
  1.    The length of design vessel
  2.    The length of design vessel + 10% clearance between adjacent vessels
  3.    The length of design vessel + 20% clearance between adjacent vessels
  4.    Twice the length of design vessel
Explanation:-
Answer: Option C. -> The length of design vessel + 20% clearance between adjacent vessels
Question 2. 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
  1.    (i) and (ii) are correct
  2.    (ii) and (iii) are correct
  3.    (i) and (iii) are correct
  4.    (i), (ii) and (iii) are correct
Explanation:-
Answer: Option B. -> (ii) and (iii) are correct
Question 3. When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as
  1.    Beam
  2.    Depth
  3.    Free-board
  4.    Draft
Explanation:-
Answer: Option D. -> Draft
Question 4. The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be
  1.    1 L
  2.    1.5 L
  3.    2.0 L
  4.    4.0 L
Explanation:-
Answer: Option D. -> 4.0 L
Question 5. 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
  1.    (i) and (ii) are correct
  2.    (ii) and (iii) are correct
  3.    (i) and (iii) are correct
  4.    Only (iii) is correct
Explanation:-
Answer: Option C. -> (i) and (iii) are correct
Question 6. 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
Explanation:-
Answer: Option C. -> 1.2 H to 1.25 H above the high water level
Question 7. 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
Explanation:-
Answer: Option D. -> Results in less damage due to gradual failure
Question 8. For designing the dock, the proportion of ship load assumed to be borne by keel blocks is
  1.    $$\frac{5}{8}$$
  2.    $$\frac{3}{8}$$
  3.    $$\frac{3}{{16}}$$
  4.    $$\frac{5}{{16}}$$
Explanation:-
Answer: Option A. -> $$\frac{5}{8}$$
Question 9. 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
Explanation:-
Answer: Option D. -> (iii) and (iv) are correct
Question 10. Which of the following structures protects the shore by trapping of littoral drift?
  1.    groynes
  2.    sea walls
  3.    revetments
  4.    moles
Explanation:-
Answer: Option A. -> groynes
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