Skip to main content

Super 20 Harbor MCQ

Bringing a Super 20 MCQ on Harbor Docks which is frequently asked in Exam





1. 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

2. If the maximum spring rise is 2m and height of the waves expected is 4m, then the breakwater height above the datum will be :
A. 2.5m
B. 4m
C. 5m
D. 7m

3. If H is the height of the wave expected, then the height of the breakwater is generally taken as 
A. 1.2 H to 1.25 H above the datum
B. 1.2 H to 1.25 H above the low water level
C. 1.2 H to 1.25 H above the high water level
D. 1.2 H ti 1.25 H above the mean sea level

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

5. Consider a pair of lock gates having a rise n, width of lock B and length of each gate L. If w is the unit pressure of water per unit length of gate, then the compressive force on the gate is given by :
A. wLS/n
B. wLS/4n
C. wLS/2n
D. wnLS/4

6. By increasing the rise of lockgates, 
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
A. i and ii are correct
B. i and iii are correct
C. Only ii is correct
D. Only iii is correct

7. Which of the following is a fixed type mooring accessory?
A. Bollard
B. Buoys
C. Cables
D. Anchors

8. The significant wave height is defined is the average height of the :
A. one third highest wave
B. one fourth highest wave
C. one fifth highest wave
D. one tenth highest wave

9. If Hs is the significant wave height, then the average wave height and highest wave height respectively are given by :
A. 0.6Hs and 1.67Hs
B. 0.6Hs and 1.86Hs
C. 1.27Hs and 1.87Hs
D. 1.27Hs and 1.67Hs.

10. 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



11. 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 gronyes

12. 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

13. 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

14. Which of the following structures protects the shore by trapping of littoral drift?
A. Groynes
B. Sea walls
C. Revetments
D. Moles

15. 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.

16. 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

17. If W is the weight of the ship and V is the velocity at right angle to the berth, then the berthing energy of the ship, when it first strikes the fenders, while coming alongside at a quarter point contact is :
A. WV²/g
B. WV²/2g
C. WV²/4g
D. WV²/8g

18. 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

19. Consider the following statements.
i. Fenders 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 nnear the tip of a 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

20. 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


Labels:

Comments

Post a Comment

Popular posts from this blog

Previously Asked Question

Here you will get to know on which way we are going and how we will reach the destination 1. Pick up the explosive used for tunneling in soft rocks from the following :  A. Special gelatine B. Blasting gelatine C. Ammonia dynamite D. Semi-gelatine 2. Which one of the following tunnelling method is used for lying underground sewers ? A. Needle beam method B. German method  C. Army method D. English method 3. To attain the required shape of tunnel we use : A. Cutholes B. Chisels C. Erasers D. Trimmers 4. For initial surveys of tunnel, the following activities are involved :  a. Marking portal points with concrete pillars on the ground.  b. Marking tunnel obligatory points on the topograpical maps. c. Driving lines between the fixed obligatory points. d. Preliminary setting of the tunnel on the topograpical survey of Indian maps. The correct sequence of the activities are :  A. b,a,d,c B. a,b,c,d C. d,b,c,a D. c,b,d,a 5. If 'D' is a diameter of the tunnel in meters...
Post a Comment
Read more

How to Reduce Carbon dioxide from cement?

Get an overview to learn the Basics of properties of cement and know how the carbon dioxide is being removed                          ABSTRACT Concrete is the most widely used building material in the world because of its beauty, strength, and  durability, among other benefits. Concrete is used in nearly every type of construction, including  homes, buildings, roads, bridges, airports, and subways. And in an era of increased attention to the  environmental impact of construction, concrete performs well when compared to other building  materials. As with any building product, the production of concrete and its ingredients does require energy  that in turn results in the generation of carbon dioxide, or CO2. The amount of CO2 produced during  manufacturing and the net impact of using concrete as a building material is relatively small. The  following features of concrete construction help m...
Post a Comment
Read more

Entrance Locks

Entrance Locks of Harbors and Docks Entrance Locks are those which give access to docks Components of Entrance Locks 1) Chamber: which is enclosed by quays wall on each side and bottom is paved by inverted arch flooring which resists upward water pressure when lock level is low 2) The gates closing entrance constructed of wood or iron of heavy design to withstand water pressure 3) The sill is raised above the gate floor by 2 foot 4) Sluice way   provided in side walls for filling and emptying locks Dimensions of Entrance and Locks It main factor are width, size, and displacement of the longest vessels. Modern locks have width vary from 80 foot and above and depth 25 foot to 40 foot and length of 800 foot and over. Construction of Entrance and Locks Materials   generally used are: 1)Wood 2)Iron Wooden Gates It consists of a horizontal beam that is spaced closer at the bottom to resist water pressure and joined together by heel post in such a way that two extreme ends meet...
Post a Comment
Read more