Docks and Harbours - Section 1 (3)

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Docks and Harbours - Section 1

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17.

The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ₁ and θ₂. The distances AB = L₁ and BC = L₂. For calculating the angle α₂ at C between the boat and station B is obtained by using the following formula: where (β is horizontal angle between A and C at B).

A.
B.	αt tan α2 = 360° - (θ1 + θ2 + β) = φ
C.
D.	all the above.

Answer: Option D

Explanation:

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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.	weakens the foundation
E.	all of the above.

Answer: Option E

Explanation:

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19.

On a hydrographic map, the following feature is shown :

A.	datum
B.	high and low water lines
C.	depth contours
D.	land and water areas
E.	all the above.

Answer: Option E

Explanation:

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20.

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 x 40 cm in cross-section
C.	the middle block is 1.6 m long 40 cm x 40 cm in crosss-section
D.	the top block is 1.2 m long 40 cm x 40 cm in cross-section
E.	none of these.

Answer: Option E

Explanation:

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21.

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 the above.

Answer: Option D

Explanation:

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22.

P and Q are two stations on the shore line at distance d. If the angle between Q and the boat O and P is a and the angle between P and Q at boat O is β, the x and y. Coordinate along PQ and perpendicular to PQ from O are :

A.
B.
C.
D.	none of the above.

Answer: Option A

Explanation:

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23.

The low water datum for a lake is defined as the surface of the lake when it is at elevation

A.	180.5 m above M.S.L.
B.	190.5 m above M.S.L.
C.	170.5 m above M.S.L.
D.	200.0 m above M.S.L.

Answer: Option A

Explanation:

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24.

The fixed mooring does not require

A.	mooring post
B.	bollard
C.	anchors
D.	capstan.

Answer: Option C

Explanation:

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Docks and Harbours - Section 1 (3)

Docks and Harbours - Section 1

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