Ch. 2

Question 1

To break a sheer in a narrow channel a pilot should

Answer 1

Increase engine revolutions

Increase rudder toward the bank

Question 2

Your vessel is steaming parallel to a shoal or bank. How does she behave?

Answer 2

Her bow will move away from the bank or shoal

Her stern moves toward the bank or shoal

Question 3

T or F Competent shiphandlers don’t just react. They think ahead, anticipate situations, and plan alternative maneuvers

Answer 3

True

Question 4

T or F Ships with variable pitch propellers steer best if speed is reduced quickly?

Answer 4

False

Question 5

Advantages of omnidirectional propulsion systems over conventional systems include.

Answer 5

greater safety

increased maneuverability

Question 6

T or F Shiphandlers should re-evaluate any maneuver requiring repeated use of the engine or thrusters at half ahead and full power

Answer 6

True

Question 7

T or F When steering using azipods in the at sea mode the pod is turned to port to turn the ship to starboard?

Answer 7

True

Question 8

Although azipods may be placed in virtually any position, there are three positions that have been found to be most effective in practical use. They are

Answer 8

At sea mode - used in open waters
Harbor mode - used in narrow channels
Docking mode - used as ship approaches the berth

Question 9

When operating in harbor mode, the pods are placed at 45 degrees in opposition to each other. The vessel is turned to port by moving the ______ control ahead and pulling back on the ______ control.

Answer 9

starboard, port

Question 10

A good rule of thumb to change from automatic to manual control is within ______ from a fixed object of dock

Answer 10

One ship length

Question 11

The tactical diameter and turning rate can be adjusted during a turn by visually aligning an external fixed object with a reference point aboard ship

Answer 11

The tactical diameter is decreasing when the object moves ahead relative to the ship reference point

The rate of turn is increasing if the object moves ahead more rapidly

Question 12

T or F It is best to overtake another ship in a narrow channel at slow speed, while the ovretaken ship should increase her speed before being passed.

Answer 12

False

Question 13

The clicking sound made by the gyro compass should be eliminated as it distracts the pilot

Answer 13

False

Question 14

A rate-of-turn indicator usually indicates turning rate in _______ per second or _______ per minute.

Answer 14

Tenths of a degree

degrees per minute

Question 15

A ship changes draft when moving into shallow water. The change in draft is known as ______. The hull rotation about the transverse axis and resulting change in trim forward or aft is known as _______. The increase in deep draft, forward or aft is called ______.

Answer 15

sinkage, trim, squat

Question 16

The increasing pressure drop under a hull and the corresponding increase in squat caused by water flowing under the hull at increased velocity as ship’s speed increases, follows a basic principle of physics known as the ___________ Principle

Answer 16

bernoulli

Question 17

T or F Ships always tim by the stern in shallow water?

Answer 17

False

Question 18

The pilot or ship’s officer can reduce sinkage and squat by reducing the ________.

Answer 18

Speed and the rate and period of acceleration

Question 19

Squat for a given speed and hull condition in confined water is ________ that in open water.

Answer 19

Twice

Question 20

A useful formula for calculating approximate sinkage in open waters is ________

Answer 20

Squat (feet) = block coefficient x (speed in knots)^2/30

for shallow water multiply the squat found by 2

Question 21

UKC is influenced by several factors including

Answer 21

Speed
Channel dimensions
changes in engine revs
vessel interaction

Question 22

UKC is reduced significantly when two ships pass in a narrow channel because squat increases _______% to _____% or even more depending on ships speed and distance of separation

Answer 22

50% to 60%

up to 100% or more

Question 23

UKC is reduced signifcantly as the ship accelerates and squat increases as much as _______%

Answer 23

Double

Question 24

T or F Wide beam ships increase draft significantly when they roll, so rolling may have a greater impact on UKC than draft.

Answer 24

True

Question 25

T or F Changes in the shape of a channel have no affect on squat as long as the blockage factor does not change

Answer 25

False

Question 26

If block coefficient is greater then ___ likely to trim by the head. If block coefficient is greater less than ____ likely to trim by the stern.

Answer 26

.75

.7