Q.1
If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by
Q.2
The difference in height between highest high water and lowest low water is called
Q.3
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:
Q.4
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:
Q.5
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
Q.6
As per Stevenson’s empirical formula, the approximate value of the height of the wave in metres is given by (where F is the fetch in km.)
Q.7
At a given port, the fetch is 400 nautical miles, the maximum height of storm wave will be
Q.8
In multiple point mooring system, vessel is secured to minimum of
Q.9
Which of the following type of sea walls results in greatest protection of shore structures?
Q.10
Consider the following statements.
(i) Fender is the cushion provided on the face of the jetty for ships to come in contact,
(ii) Slip is the space of water area between two adjacent piers where ships are berthed,
(iii) Pier head is a structure constructed near the tip of a break water near the harbour entrance.
Of the statements
Q.11
Which of the following is a fixed type mooring accessory ?
Q.12
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.
Q.13
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:
Q.14
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:
Q.15
A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called.
Q.16
Minimum width of ship clearance shall be (where “B” is beam of the design vessel)
Q.17
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.)
Q.18
For designing the dock, the proportion of ship load assumed to be borne by keel blocks is
Q.19
As compared to wall type breakwater, mound type breakwater
Q.20
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
0 h : 0 m : 1 s