Ch. 1

Question 1

T or F In day-to day work, the most useful unit of measurement for estimating turning circles and other distances is the ship’s own length.

Answer 1

True

Question 2

In shallow water, a ship’s turning circle is ________.

Answer 2

Larger

Question 3

An average-size ship turning circle is usually slightly ________ when the ship turns to the right than when she turns left.

Answer 3

Larger

Question 4

A VLCC’s turning circle to the right is usually ________ her turning circle to the left.

Answer 4

Nearly the same as

Question 5

When revolutions are increased during a turn the tactical diameter becomes _________.

Answer 5

Smaller

Question 6

For a given rudder angle and engine speed, the rate of turn _______ as the depth of the water decreases.

Answer 6

Does not change

Question 7

T or F A ship can be backed and filled in the smallest are when turned to the left.

Answer 7

False

Question 8

You are aboard an average-size, loaded, aft house tanker proceeding through open roadstead. Wind blowing hard enough to overcome twisting effect. When you back your ship you would expect her to

Answer 8

Head into the wind while she has headway and back into the wind when she has sternway

Question 9

Assuming there are no extraordinary wind, current, or bank effects, a ship should be swinging moderately to __________ before her engine is put astern.

Answer 9

Port

Question 10

A bowthruster is sometime preferable to tugs because

Answer 10

It is located at the extreme ends of the vessel
available at all times
Good lateral control
Save on expenses for tugs

Question 11

What are the disadvantages of bowthrusters

Answer 11

ineffective at high speed
less powerful than tug
can not slow or hold against current
unusable at light drafts
require maintenance

Question 12

Bow thrusters are usually quite effective at speeds up to 5 knots

Answer 12

False

Question 13

The concept of using the most effective maneuver is important because

Answer 13

• The ship is maneuvered using the minimum number of engine and rudder orders
• Several tasks are accomplished simultaneously

Question 14

How would you expect the following shiphandling characteristics to change as your ship moves from deep to shallow water

Answer 14

• Tactical diameter will increase
• twisting effect when backed will increase
• Rate of turn no significant change
• Speed loss during large course changes decrease
• speed loss when engine stopped Increase
• Directional stability Increase

Question 15

How would you expect the following to effect directional stability?

Answer 15

Increased length- more positive
increased beam - less positive
Increased drag - more positive
Decreased UKC - more positive
Increased block coefficient - less positive
more full sections forward - less positive
Increased rudder angle-
Ship trimmed by the head - less positive
increased squat by the head - less positive

Question 16

T or F Ships with large block coefficients are more likely to trim by the head in shallow water.

Answer 16

True

Question 17

Which of the following statements is/are true for ships with negative stability?

Answer 17

A larger rudder angle is needed for longer periods of time to start a turn
A larger rudder angle is needed for a longer period of time to steady up after a turn
The ships rate of turn increases when the rudder is put amidships during a turn

Question 18

T or F The only effective way to slow a ship is to stop the engine and, if necessary, go astern

Answer 18

False

Question 19

A VLCC makes a hard over turn. You would expect her to lose nearly ______% of her headway when her heading changes by 90 degrees

Answer 19

25%-30%

Question 20

In a crossing situation where collision exists what might be a good option other than backing in order to slow down?

Answer 20

Make a round turn

Question 21

A combination pilot ladder/accommodation ladder is required when the distance from the water to the top of the water exceeds ____ feet.

Answer 21

30

Question 22

T or F A modern container ship has more sail area than a full rigged sailing ship?

Answer 22

True

Question 23

Mathmatically when will shallow water effect become significant?

Answer 23

Depth = 1.5 x Draft

Question 24

Mathmatically when will shallow water effect be felt?

Answer 24

Depth = 1.2 x Draft