# Docks and Harbor Engineering MCQ Civil Engineering

50 Questions 30 Mins

### About Docks and Harbor Engineering

Following are some of the multiple choice questions on the Docks and Harbor Engineering with answers that will help the students in developing their knowledge.

## Docks and Harbor Engineering MCQ

### 1. 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:

• Both A and R are true and R is correct explanation of
• Both A and R are true but R is not the correct explanation of
• A is true but R is false.
• A is false but R is true.

• Surf
• Clapotis
• Fetch
• Swell

### 3. 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 a break water near the harbour entrance. Of the statements

• (i) and (ii) are correct
• (ii) and (iii) are correct
• (i) and (iii) are correct
• (i), (ii) and (iii) are correct

• bollard
• buoys
• cables
• anchors

### 5. A ship strikes the berth generally at an angle

• 90° with the face of the dock
• 45° with the face of the dock
• 30° with the face of the dock
• 10° with the face of the dock

### 6. Which of the following are repair docks ?

• marine railways, dry docks, floating docks, wet docks
• dry docks, wet docks, floating docks, lift docks
• wet docks, floating docks, lift docks, marine railways
• wet docks, lift docks, marine railways, dry docks

• Two points
• Four points
• Six points
• Eight points

### 8. Which of the following type of sea walls results in greatest protection of shore structures?

• vertical sea wall
• sea wall with batter
• stepped sea wall
• sea wall with concave face

### 9. 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.

• Both A and R are true and R is the correct explanation of
• Both A and R are true but R is not a correct explanation of
• A is true but R is false.
• A is false but R is true.

### 10. The most popular method of construction of wall breakwaters is

• Barge method
• Staging method
• Low level method
• none of the above

### 11. 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:

• Both A and R are true and R is the correct explanation of
• Both A and R are true but R is not the correct explanation of
• A is true but R is false.
• A is false but R is true.

### 12. Assertion A : Basin walls have to be of much grater 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:

• Both A and R are true and R is the correct explanation of
• Both A and R are true but R is not correct explanation of
• A is true but R is false.
• A is false but R is true.

### 13. 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:

• Both A and R are true and R is the correct explanation of
• Both A and R are true but R is not the correct explanation of
• A is true but R is false.
• A is false but R is true.

• 2.5 m
• 4 m
• 5 m
• 7 m

• 0.34 VF
• 0.5 VF
• 1.5 VF
• 3.4 VF

• 2.073 m
• 8.169 m
• 9.144 m
• 6.8 m

### 17. If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by

• 0.6 Hs and 1.67 Hs
• 0.6 Hs and 1.87 Hs
• 1.27 Hs and 1.87 Hs
• 1.27 Hs and 1.67 Hs

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

• Mean range
• Maximum range
• Maximum rise
• Mean rise

### 19. 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

• (i) and (ii) are correct
• (i) and (iii) are correct
• Only (ii) is correct
• Only (iii) is correct

• Beam
• Depth
• Free-board
• Draft

### 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 is highest Of these statements

• (i) and (ii) are correct
• (ii) and (iii) are correct
• (i) and (iii) are correct
• (i), (ii) and (iii) are correct

### 22. Dead weight tonnage of a ship(i) varies with latitude and season(ii) is more than displacement tonnage(iii) is the difference between displacement load and displacement light Of these statements

• (i) and (ii) are correct
• (ii) and (iii) are correct
• (i) and (iii) are correct
• Only (iii) is correct

• 1 L
• 1.5 L
• 2.0 L
• 4.0 L

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

• Sea walls, bulk heads and groynes
• Sea walls, bulk heads and revetments
• Sea walls, revetments and groynes
• Bulk heads, revetments and groynes

### 25. The significant wave height is defined is the average height of the

• one – third highest waves
• one – fourth highest waves
• one – fifth highest waves
• one – tenth highest waves

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

• Manoeuvring lane + (2 × Bank clearance lane)
• (2 × Manoeuvring lane) + (2 × Bank clearance lane)
• (2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)
• Manoeuvring lane + (2 × Bank clearance lane) + ship clearance lane

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

• When the dock is empty
• When the dock is empty with the ship of maximum tonnage
• When the dock is full of water
• When the dock is dry and is under construction

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

• The length of design vessel
• The length of design vessel + 10% clearance between adjacent vessels
• The length of design vessel + 20% clearance between adjacent vessels
• Twice the length of design vessel

• 5/8
• 3/8
• 3/16
• 5/16

### 30. As compared to wall type breakwater, mound type breakwater

• Requires skilled labor
• Requires low maintenance cost
• Requires less material
• Results in less damage due to gradual failure

### 31. 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

• (i) and (ii) are correct
• (i) and (iii) are correct
• (ii) and (iv) are correct
• (iii) and (iv) are correct

### 32. If H is the height of the wave expected, then the height of the breakwater is generally taken as

• 1.2 H to 1.25 H above the datum
• 1.2 H to 1.25 H above the low water level
• 1.2 H to 1.25 H above the high water level
• 1.2 H to 1.25 H above the mean sea level

• groynes
• sea walls
• revetments
• moles

### 34. A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called.

• Dry dock
• Wet dock
• Floating dock
• Refuge dock

### 35. Minimum width of ship clearance shall be (where “B” is beam of the design vessel)

• B or 30 m
• 1.5 B or 50 m
• 1.5 B
• 50 m

• 1.3412
• 1.5612
• 1.7412
• 1.9412