Tricky Docks and Harbour Engineering Multiple choice Questions and Answers pdf

21.    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.
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 correct explanation of A.
c)    A is true but R is false.
d)    A is false but R is true.

Ans: a

22. In multiple point mooring system, vessel is secured to minimum of
a)    two points
b)    four points
c)    six points
d)    eight points

Ans: b

23.    By increasing the rise of lock gates,
(i)   the length of the lock gate  will increase
(ii)  transverse stress due to water pressure on the gate will increase
(iii) compressive force on the gate will increase Of these statements
a)    (i) and (ii) are correct
b)    (i) and (iii) are correct
c)    Only (ii) is correct
d)    Only (iii) is correct

Ans: a

24.    Which of the following is a fixed type mooring accessory ?
a)    bollard
b)    buoys
c)    cables
d)    anchors

Ans: a

25.    The significant wave height is defined is the average height of the
a)    one - third highest waves
b)    one - fourth highest waves
c)    one - fifth highest waves
d)    one - tenth highest waves

Ans: a

26.    If Hs is the significant wave height, then the average wave height and highest wave height respectively are given by

a)    0.6 Hs and 1.67 Hs
b)    0.6 Hs and 1.87 Hs
c)    1.27 Hs and 1.87 Hs
d)    1.27 Hs and 1.67 Hs

Ans: b

27.    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
a)    Surf
b)    Clapotis
c)    Fetch
d)    Swell

Ans: b

28.    Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area ?
a)    sea walls, bulk heads and groynes
b)    sea walls, bulk heads and revetments
c)    sea walls, revetments and groynes
d)    bulk heads, revetments and groynes

Ans: b

29.    Which of the following type of sea walls results in greatest protection of shore structures?
a)    vertical sea wall
b)    sea wall with batter
c)    stepped sea wall
d)    sea wall with concave face

Ans: d

30.    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.
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 a correct explanation of A.
c)    A is true but R is false.
d)    A is false but R is true.

Ans: a

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