Docks and Harbour Engineering Multiple Choice Questions and Answers for Freshers & Experienced pdf free download

1. 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 are true and R is the correct explanation of A.
b)    Both A and R are 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.

Ans: a

2. 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

Ans: d

3. 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

Ans: d

4. The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be
a)    L
b)    1.5 L
c)    2.0 L
d)    4.0 L
where L is the length of the largest ship to use the port

Ans: d

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
a)    i) and ii) are correct
b)    ii) and iii) are correct
c)    i) and iii) are correct
d)    Only iii) is correct

Ans: c

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

Ans: c

7.    As per Stevenson's empirical formula, the approximate value of the height of the wave in metres is given by
a)    0.34 VF
b)    0.5 VF
c)    1.5 VF
d)    3.4 VF
where F is the fetch in km.

Ans: a

8.    As per Berlin's formula, the length of wave in metres is given by
a)    1.3412
b)    1.5612
c)    1.7412
d)    1.9412
where 't' is the period in seconds for two successive waves to pass the same section.

Ans: b

9.    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 are true and R is correct explanation of A.
b)    Both A and R are 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.

Ans: a

10.   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

Ans: b

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