# Docks and Harbour Engineering Multiple choice Questions

Posted On:February 2, 2019, Posted By: Latest Interview Questions, Views: 1379, Rating :

## Best Docks and Harbour Engineering Objective Questions and Answers

Dear Readers, Welcome to Docks and Harbour Engineering Objective Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Docks and Harbour Engineering MCQs. These objective type Docks and Harbour Engineering questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular question during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.

### Reason R : The entrance to a harbour is usually more exposed to waves as compared to the harbour itself.

a) Both A and R are true and R is the correct explanation of A.

b) Both A and R are 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.

Ans: a

a) beam

b) depth

c) freeboard

d) draft

Ans: d

### 3. 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

Ans: d

### 4. The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be

a) L

b) 1.5 L

c) 2.0 L

d) 4.0 L

where L is the length of the largest ship to use the port

Ans: d

### 5. 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

a) i) and ii) are correct

b) ii) and iii) are correct

c) i) and iii) are correct

d) Only iii) is correct

Ans: c

### 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

Ans: c

### 7. As per Stevenson's empirical formula, the approximate value of the height of the wave in metres is given by

a) 0.34 VF

b) 0.5 VF

c) 1.5 VF

d) 3.4 VF

where F is the fetch in km.

Ans: a

### 8. As per Berlin's formula, the length of wave in metres is given by

a) 1.3412

b) 1.5612

c) 1.7412

d) 1.9412

where 't' is the period in seconds for two successive waves to pass the same section.

Ans: b

### Reason R : No wave can have a height greater than the depth of water through which it passes.

a) Both A and R are true and R is correct explanation of A.

b) Both A and R are 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.

Ans: a

### 10.   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

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

Ans: b

a) 2.073 m

b) 8.169 m

c) 9.144 m

d) 6.8 m

Ans: c

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

a) Manoeuvring lane + 2 x Bank clearance lane

b) 2 x Manoeuvring lane + 2 x Bank clearance lane

c) 2 x Manoeuvring lane + 2 x Bank clearance lane + ship clearance lane

d) Manoeuvring lane +   2 x Bank clearance lane + ship clearance lane

Ans: c

### 13.     Minimum width of ship clearance shall be

a) B or 30 m

b) 1.5 B or 50 m

c) 1.5 B

d) 50 m

where "B" is beam of the design vessel

Ans: a

### 14. 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 cons-truction, the work is not interrupted even during stormy weather.

Ans: b

### 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 are true and R is the correct explanation of A.

b) Both A and R are 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.

Ans: a

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

a) Barge method

b) Staging method

c) Low level method

d) none of the above

Ans:

### 17. 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

Ans: d

a) mean range

b) maximum range

c) maximum rise

d) mean rise

Ans: b

a) 2.5 m

b) 4 m

c) 5 m

d) 7 m

Ans: d

### 20. 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 to 1.25 H above the mean sea level

Ans: c

### Reason R : Tidal basins are subject to fluctuations of levels due to tidal variations.

a) Both A and R are true and R is the correct explanation of A.

b) Both A and R are 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.

Ans: a

a) two points

b) four points

c) six points

d) eight points

Ans: b

### (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

Ans: a

a) bollard

b) buoys

c) cables

d) anchors

Ans: a

### 25. 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

Ans: a

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

a) 0.6 Hs and 1.67 Hs

b) 0.6 Hs and 1.87 Hs

c) 1.27 Hs and 1.87 Hs

d) 1.27 Hs and 1.67 Hs

Ans: b

a) Surf

b) Clapotis

c) Fetch

d) Swell

Ans: b

### 28. 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

Ans: b

### 29. 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

Ans: d

### 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.

a) Both A and R are true and R is the correct explanation of A.

b) Both A and R are 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.

Ans: a

### 31.      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

Ans: c

a) groynes

b) sea walls

c) revetments

d) moles

Ans: a

### 33. 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

Ans: c

a) 5/8

b) 3/8

c) 3/16

d) 5/16

Ans: a

### 35. 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

Ans: d

### (iii) Pier head is a structure constructed near 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

Ans: d

a) Dry dock

b) Wet dock

c) Floating dock

d) Refuge dock

Ans: c