DOCKS AND HARBOR ENGINEERING QUIZ

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

1.5 B or 50 m

B or 30 m

50 m

1.5 B

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Clapotis

Swell

Fetch

Surf

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a fixed type mooring accessory ?

buoys

cables

anchors

bollard

TRUE ANSWER : ?
YOUR ANSWER : ?

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 but R is not the correct explanation of A.

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

A is false but R is true.

A is true but R is false.

TRUE ANSWER : ?
YOUR ANSWER : ?

As per Berlin's formula, the length of wave in meters is given by(Where ’t’ is the period in seconds for two successive waves to pass the same section.)

1.7412

1.3412

1.9412

1.5612

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Only (ii) is correct

(i) and (iii) are correct

Only (iii) is correct

(i) and (ii) are correct

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1.5 L

4.0 L

1 L

2.0 L

TRUE ANSWER : ?
YOUR ANSWER : ?

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 but R is not a correct explanation of A.

A is false but R is true.

A is true but R is false.

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The most popular method of construction of wall breakwaters is

Staging method

Barge method

None of these

Low level method

TRUE ANSWER : ?
YOUR ANSWER : ?

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

The length of design vessel + 20% clearance between adjacent vessels

The length of design vessel + 10% clearance between adjacent vessels

The length of design vessel

Twice the length of design vessel

TRUE ANSWER : ?
YOUR ANSWER : ?