Deck 2: Marine Structures and Harbor Operations

Question 1

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

Answer 1

9.144 m

Question 2

Pick up the correct statement from the following:

A)Spring tides are caused at new and full moon
B)Neap tides are caused when the moon is in her quarters
C)Spring tides are roughly twice the height of neap tides
D)All of the above

Answer 2

All of the above

Question 3

Which of the following is a fixed type mooring accessory?

A)Bollard
B)Buoys
C)Cables
D)Anchors

Answer 3

Bollard

Question 4

According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for cargo vessels is

A)5.5 and 6.0 to 1
B)6.2 and 6.8 to 1
C)7.4 and 7.8 to 1
D)8.2 and 8.5 to 1

Question 5

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 break water near the harbour entrance. Of the statements

A)(i) and (ii) are correct
B)(ii) and (iii) are correct
C)(i) and (iii) are correct
D)(i), (ii) and (iii) are correct

Question 6

Pick up the correct statement from the following:

A)For nautical purposes, low water level is generally referred to by the navigators
B)The depth of the bed of the sea from the surface of water is called sounding
C)The contour lines on the bed of a water body are called fathoms
D)All the above

Question 7

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
Of these statements

A)(i) and (ii) are correct
B)(i) and (iii) are correct
C)(ii) and (iv) are correct
D)(iii) and (iv) are correct

Question 8

Which one of the following statements is correct?

A)The soundings are made with respect to the mean low water
B)The soundings which are below the datum are written in black on the map
C)The spot heights of the features above datum are written in red on the map
D)All the above

Question 9

Which of the following are repair docks?

A)Marine railways, dry docks, floating docks, wet docks
B)Dry docks, wet docks, floating docks, lift docks
C)Wet docks, floating docks, lift docks, marine railways
D)Wet docks, lift docks, marine railways, dry docks

Question 10

The smoothened surface of the front face of the guay walls, is known as fending which is made of

A)Granite stone
B)Timber
C)Steel
D)All the above

Question 11

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:

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 the correct explanation of A
C)A is true but R is false
D)A is false but R is true

Question 12

Pick up the incorrect statement from the following: In a dry dock block made of hard wood,

A)Spacing of the blocks is 1.35 m
B)The lowest block is 1.8 m long 40 cm × 40 cm in cross-section
C)The middle block is 1.6 m long 40 cm × 40 cm in cross-section
D)None of these

Question 13

Which one of the following lines is used for tying a ship with a dock?

A)Bow line
B)Stern line
C)Spring line
D)All of these

Question 14

In a wet dock system,

A)Minimum required depth of water for the vessels is maintained
B)Entrance locks are provided with massive gates
C)The cost of construction is quite heavy
D)All the above

Question 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 is true and R is the 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 16

A dock:

A)Is a marine structure for berthing of vessels for loading and unloading cargo and passengers
B)Is provided with a dock gate
C)Is provided with an arrangement to pump out water when required
D)All the above

Question 17

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

Question 18

Pick up the correct statement from the following:

A)An artificial barrier which makes the enclosed area safe for anchorage of ships, is known as break water
B)The break water whose inside is used as a platform for loading and unloading is called a mole
C)The length of the quay wall is governed by the length of the largest vessel likely to be berthed
D)All the above

Question 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

Question 20

Pick up the correct statement function following:

A)The coarse material which has a smaller angle of repose, causes a steeper beach slope
B)The coarse material which has a greater angle of repose, causes a steeper beach slope
C)The flattening out of the beach is caused due to the movement of small and uniform particles leeward
D)Both (b) and (c)

Question 21

Consider the following statements in regard to Beaufort scale for wind speeds, (i) The Beaufort number ranges from 1 to 12. (ii) Higher Beaufort number indicates higher speed of wind, (iii) Beaufort number for calm is smallest and for hurricane ishighest Of these statements

A)(i) and (ii) are correct
B)(ii) and (iii) are correct
C)(i) and (iii) are correct
D)(i), (ii) and (iii) are correct

Question 22

The shore line survey includes:

A)Depicting the shore line
B)Depicting the prominent details on shore line
C)Depicting the high water line
D)All the above

Question 23

A harbour is a place where

A)Ships get shelter and protection against destructive forces due to sea waves
B)Facilities are provided for receiving cargo and passengers
C)Port buildings are constructed for commercial purposes
D)All of the above

Question 24

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

Question 25

A roadstead:

A)Is a protected area of water where boats can move safely
B)Is the end of the road at the harbour
C)May be protected by break water walls
D)None of these