OJT DAY 4 QUIZ

These are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship's roll due to wind or waves. Active fins are controlled by a gyroscopic control system.

• RUDDER

• STABILIZER

• KEEL

• PROPELLER

What are the disadvantages of stabilizers?

• Reduce speed and increased drag and fuel

• Increased speed and fuel

• Increased efficiency and stability

• Decreased speed and drag

What are the advantages of using a stabilizer?

• Decreased rolling and comfortability

• Increased drag and comfortability

• Reduced rolling and increased comfortability

• Increased rolling and drag

A piece of equipment used to convert the output shaft revolutions of the main engine to those required to rotate the propeller

• Rudder

• Shafting

• Propeller

• Reduction gear

It is one of the components in a propulsion system used to transmit power.

• Rudder

• Shafting

• Propeller

• Engine

A device used for steering and maneuvering a vessel. They are located normally at the stern behind propeller(s) to produce a transverse force and steering moment about the ship's center of gravity by deflecting the water flow to the direction.

• Shafting

• Propeller

• Rudder

• Engine

A device with a rotating hub and radiating blades that when rotated it performs an action that transforms rotational power into linear thrust by acting upon a working fluid, such as water or air.

• Engine

• Shafting

• Rudder

• Propeller

It is cheaper and more robust than a CPP, it is efficient for a single specific rotational speed and load condition.

• Rudder

• Fixed pitch propeller

• Controllable pitch propeller

• Thrust

This is simply the diameter of a circle scribed by the blade tips of the propeller.

• Inside diameter

• Outside diameter

• Propeller diameter

• Pitch diameter

This type of rudder commonly used by small boats and ferries.

• Propeller rudder

• Flap rudder

• Half rudder

• Spade rudder