Deck 1: Marine Structures and Design

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

Answer 1

When the dock is full of water

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

Answer 2

Sea walls, bulk heads and revetments

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

Answer 3

Four points

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

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

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

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

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

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

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

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

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

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

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

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

Question 16

The fixed mooring does not require

A)Mooring post
B)Bollard
C)Anchors
D)Capstan

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

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

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

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

Question 21

Assertion A: Basin walls have to be of much greater 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 is true and R is the correct explanation of A
B)Both A and R is 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

Question 22

Pick up the correct statement from the following:

A)A harbour without any port complex, is called a refuge harbour
B)A harbour used for fishery, is called fishery harbour
C)The terminal building of a commercial harbour consists of an administrative block, customs clearance and ware-houses
D)All the above

Question 23

Which of the following structures protects the shore by trapping of littoral drift?

A)Groynes
B)Sea walls
C)Revetments
D)Moles

Question 24

The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be (L is the length of the ship)

A)L
B)1.5 L
C)2.0 L
D)4.0 L

Question 25

Pick up the correct statement from the following:

A)The maritime structures should be designed to withstand wave motion of air
B)The wind vortex results in conical depression in the air surface
C)A tube of air rotating at hundreds of kilometres per hour forms a tornado
D)all of the above