Question 1

Which of the following conditions of loading imposes the greatest load on the foundation in case of dry docks?
A)When the dock is empty
B)When the dock is empty with the ship of maximum tonnage
C)When the dock is full of water
D)When the dock is dry and is under construction

Accepted Answer

C

Question 2

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

Accepted Answer

Sea walls, bulk heads, and revetments are structures built parallel to the shoreline to protect the shore from erosion and to demarcate the land and water boundary. Sea walls and bulkheads serve as barriers to resist wave action, while revetments are sloped structures placed on banks or cliffs to absorb and deflect the energy of waves.

Question 3

In multiple point mooring system, vessel is secured to minimum of
A)Two points
B)Four points
C)Six points
D)Eight points

Accepted Answer

In a multiple point mooring system, a vessel is typically secured to a minimum of four points. This setup allows for better control over the vessel's position and orientation, especially in conditions where currents, wind, or wave action could cause significant movement.

Question 4

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

Accepted Answer

The answer of As compared to wall type breakwater, mound...

Question 5

In a two lane channel, bottom width of channel is given by
A)Manoeuvring lane + (2 × Bank clearance lane)
B)(2 × Manoeuvring lane) + (2 × Bank clearance lane)
C)(2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)
D)Manoeuvring lane + (2 × Bank clearance lane) + ship clearance lane

Accepted Answer

The answer of In a two lane channel, bottom width...

Question 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

Accepted Answer

The length of the berthing area should not be less than the length of the design vessel plus 20% clearance between adjacent vessels to accommodate the additional movement and spacing needed due to strong winds and tides.

Question 7

A ship strikes the berth generally at an angle
A)90° with the face of the dock
B)45° with the face of the dock
C)30° with the face of the dock
D)10° with the face of the dock

Accepted Answer

Ships typically approach and strike the berth at a small angle, often around 10°, to minimize impact and ensure safe docking.

Question 8

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

Accepted Answer

The difference in height between the highest high water and the lowest low water is referred to as the "Maximum range." This term is used in the context of tidal observations and represents the greatest tidal range observed over a specific period.

Question 9

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

Accepted Answer

Draft is the vertical distance from the waterline to the bottom of the ship's hull. It indicates how deep the ship sits in the water when it is floating at its designed waterline.

Question 10

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

Accepted Answer

Increasing the rise of lock-gates increases the water pressure, leading to increased transverse stress and requiring longer gates to accommodate the higher water level.

Question 11

For designing the dock, the proportion of ship load assumed to be borne by keel blocks is
A)5/8
B)3/8
C)3/16
D)5/16

Accepted Answer

The proportion of ship load assumed to be borne by keel blocks is typically 5/8, as keel blocks are designed to support the majority of the ship's weight when it is docked.

Question 12

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

Accepted Answer

Clapotis is the phenomenon described, where waves meeting their reflections cause a standing wave pattern that can dramatically increase the water's vertical motion against structures like breakwaters.

Question 13

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 construction, the work is not interrupted even during stormy weather

Accepted Answer

The answer of Select the incorrect statement.
A)The progress of work...

Question 14

Pick up the correct statement from the following:
A)The regular periodic rise and fall of the surface of the sea, is called tide
B)The average difference in water level between high tide and low tide at a place, is called tidal range
C)The movement of water caused by the action of tide, is called a tidal current
D)all of the above

Accepted Answer

All statements are correct: A) defines tides, B) explains tidal range, and C) describes tidal currents, all of which are fundamental concepts related to the study of tides and their effects on coastal environments.

Question 15

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

Accepted Answer

The significant wave height is defined as the average height of the one-third highest waves. This is a standard metric used in oceanography and marine forecasting to estimate wave conditions.

Question 16

The fixed mooring does not require
A)Mooring post
B)Bollard
C)Anchors
D)Capstan

Accepted Answer

Fixed mooring systems typically rely on permanent structures like mooring posts, bollards, and capstans for securing vessels, rather than using anchors, which are more associated with temporary or mobile mooring solutions.

Question 17

A ship is berthed in a chamber and lifted by principles of buoyancy, such a chamber is called.
A)Dry dock
B)Wet dock
C)Floating dock
D)Refuge dock

Accepted Answer

A floating dock is a type of dock that operates based on principles of buoyancy, allowing it to lift a ship out of the water for maintenance or repair.

Question 18

Due to the impact of water wave on a sea shore structure
A)Hydrostatic pressure coupled with a strong momentary impact is caused
B)Vibrations are subjected
C)Internal pressure is developed
D)All of the above

Accepted Answer

The impact of water waves on a sea shore structure can cause hydrostatic pressure coupled with a strong momentary impact, subject the structure to vibrations, and develop internal pressure, thus all of the given options are correct.

Question 19

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 is true and R is correct explanation of A
B)Both A and R is 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

Accepted Answer

The answer of Assertion A: Intervention of undulations in the...

Question 20

Surf zone is:
A)The fathom line of 10 m depth
B)The fathom line of 5 m depth
C)The swell of the sea breaking on the shore or reefs
D)The coast line attacked by the waves

Accepted Answer

The surf zone is characterized by the swell of the sea breaking on the shore or reefs, where the energy of the waves is dissipated as they crash onto the beach or reef.

Quiz 1: Marine Structures and Design

Which of the following conditions of loading imposes the greatest load on the foundation in case of dry docks?

Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area?

In multiple point mooring system, vessel is secured to minimum of

As compared to wall type breakwater, mound type breakwater

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

In basins subjected to strong winds and tide, the length of the berthing area should not be less than

A ship strikes the berth generally at an angle

The difference in height between highest high water and lowest low water is called

When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as

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

For designing the dock, the proportion of ship load assumed to be borne by keel blocks is

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

Select the incorrect statement.

Pick up the correct statement from the following:

The significant wave height is defined is the average height of the

The fixed mooring does not require

A ship is berthed in a chamber and lifted by principles of buoyancy, such a chamber is called.

Due to the impact of water wave on a sea shore structure

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:

Surf zone is: