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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Hiried Docks and Harbour Engineering Multiple choice Questions and Answers pdf

11. At a given port, the fetch is 400 nautical miles, the maximum height of storm wave will be
a)    2.073 m
b)    8.169 m
c)    9.144 m
d)    6.8 m

Ans: c

12. In a two lane channel, bottom width of channel is given by

a)    Manoeuvring lane + 2 x Bank clearance lane
b)    2 x Manoeuvring lane + 2 x Bank clearance lane
c)    2 x Manoeuvring lane + 2 x Bank clearance lane + ship clearance lane
d)    Manoeuvring lane +   2 x Bank clearance lane + ship clearance lane

Ans: c

13.     Minimum width of ship clearance shall be
a)    B or 30 m
b)    1.5 B or 50 m
c)    1.5 B
d)    50 m
where "B" is beam of the design vessel

Ans: a

14.    Select the incorrect statement.
a)    The progress of work in low level method of mound construction is very slow.
b)    Barge method of mound construction is economical.
c)    In low level method of mound construction, the area of working is limited.
d)    In staging method of mound cons-truction, the work is not interrupted even during stormy weather.

Ans: b

15.    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:
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

16.    The most popular method of construction of wall breakwaters is
a)    Barge method
b)    Staging method
c)    Low level method
d)    none of the above

Ans:

17. As compared to wall type breakwater, mound type breakwater
a)    requires skilled labour
b)    requires low maintenance cost
c)    requires less material
d)    results in less damage due to gradual failure

Ans: d

18.    The difference in height between highest high water and lowest low water is called
a)    mean range
b)    maximum range
c)    maximum rise
d)    mean rise

Ans: b

19.    If the maximum spring rise is 2 m and height of the waves expected is 4 m , then the breakwater height above the datum will be
a)    2.5 m
b)    4 m
c)    5 m
d)    7 m

Ans: d

20.    If H is the height of the wave expected, then the height of the breakwater is generally taken as
a)    1.2 H to 1.25 H above the datum
b)    1.2 H to 1.25 H above the low water level
c)    1.2 H to 1.25 H above the high water level
d)    1.2 H to 1.25 H above the mean sea level

Ans: c

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