Final

Question 1

6 degrees of freedom

Answer 1

Roll
Pitch
Surge
Sway
Heave
Yaw

Question 2

The ratio of length to beam

Answer 2

Effects turning quality

Question 3

A wider vessel

Answer 3

Turns better

Question 4

A narrow vessel

Answer 4

Maintains heading

Question 5

A broad ship requires

Answer 5

More work to maintain its heading

Question 6

What criteria characterize a ship?

Answer 6

The hull 
Propulsión type
Rudder type
Special equipment: thrusters
Windward surface

Question 7

The ratio of the hull volume over the cuboid containing it is called the

Answer 7

Block coefficient

Question 8

Block coefficient formula

Answer 8

V / L x B x Te

Question 9

Block coefficient can vary from

Answer 9

.5 fast naval to .85 for VLCC

Question 10

Propeller creates a force of about

Answer 10

1 ton per 100 hp

Question 11

Most common engine

Answer 11

Slow speed diesel

Question 12

First successful steamship screw propulsion on oceans

Answer 12

SS Archimedes

Question 13

HMS Rattler

Answer 13

Screw powered wins tug of war with paddle wheel HMS Alecto at Dover trails 1845

Question 14

High pressure creates

Answer 14

Thrust

Question 15

Low pressure creates

Answer 15

Drift

Question 16

Bernoulli

Answer 16

High speed = low pressure

Low speed = high pressure

Question 17

More blades =

Answer 17

Less noise

Question 18

Characteristics a propeller

Answer 18

Diameter
Number and type of blades
Pitch

Question 19

Highly skewed propellers have very

Answer 19

Strongly formed blades and reduces vibrations

Question 20

Low skewed propellers

Answer 20

Generate choppy frequency at uppermost point and causes significant vibration

Question 21

Is cavitation and aeration the same

Answer 21

Nope

Question 22

Are controllable and variable pitch the same?

Answer 22

Yes

Question 23

Cavitation generates

Answer 23

Pressure variations and causes erosion and increases drag and vibration

Question 24

Deadwood effect

Answer 24

Causes stern to kick out

Question 25

Advantages of controllable pitch

Answer 25

Change of speed reliably obtained without risk of starter issues Engine is more efficient No limit to number of reverse and forward bells Of blade damage, only the one blade needs replaced

Question 26

Disadvantages of controllable pitch

Answer 26

Complex Less efficient in reverse Line fouling

Question 27

2 high performance rudders

Answer 27

Becker | Schilling

Question 28

Kort nozzle major disadvantage

Answer 28

Drag significantly increases with speeds greater than 12 kts

Question 29

Semi balanced rudder

Answer 29

Mariner rudder

Question 30

Criteria for defining a rudder blade

Answer 30

Surface area Profile Aspect ratio Design

Question 31

First element in design of a rudder

Answer 31

Surface area. Varies from 1.5 to 5% depending on requirements of the ship

Question 32

1kw =

Answer 32

1.341 hp

Question 33

Ward and quay

Answer 33

Same. | Load/disch

Question 34

Jetty

Answer 34

Protrudes out

Question 35

How does a thruster work?

Answer 35

Shape and position of the propeller are optimized so that the thrust is same on both sides

Question 36

Four environmental conditions

Answer 36

Calm weather and sea (wind 10 or less) No current Water depth twice draft Clean hull

Question 37

Buoyancy is a

Answer 37

Hydrostatic force

Question 38

Hydrodynamic force is

Answer 38

Resistance offered by water to the hull