6. Ship Handling for the Mariner 100% Flashcards
In day-to-day work, the most useful unit of measurement for estimating turning circles and other distances is the ship’s own length?
MacElrevey 10 The correct answer is: True
In shallow water a ship’s turning circle is? 1. Larger 2. Smaller 3. The same
MacElrevey 10 & 17-18 The correct answer is: Number 1 Larger
An average-size ship’s turning circle is usually slightly when the ship turns to the right than to the left 1. Larger 2. Smaller 3. The same
MacElrevey 10-11 The correct answer is: Number 1 Larger
A VLCC’s turning circle to the right is usually her turning circle to the left. 1. Larger than 2. Smaller than 3. Nearly the same as
MacElrevey 11 The correct answer is: Number 3 Nearly the same as
When revolutions are increased during a turn, the tactical diameter becomes (or stays)? 1. Larger 2. Smaller 3. The same
MacElrevey 11 The correct answer is: Number 2 Smaller
For a given rudder angle and engine speed, the rate of turn as the depth of water increases 1. increases 2. decreases 3. does not change
MacElrevey 10 & 18 The correct answer is: Number 3 does not change
A ship can be backed and filled in the smallest area when turned to the left?
MacElrevey 11-13 The correct answer is: False
You are aboard an average-sized, loaded, house-aft tanker proceeding through an open roadstead. The wind is blowing hard enough to overcome the normal twisting effect when your ship’s engine goes astern. When you back your ship you would expect her to? 1. Head into the wind when she has headway and back into the wind when she has sternway. 2. Head away from the wind while she has headway and back away from the wind when she has sternway.
MacElrevey 14 The correct answer is: Number 1 Head into the wind when she has headway and back into the wind when she has sternway.
Assuming there are no extraordinary wind, current, or bank effects, a ship should be swinging moderately to before her engine is put astern. 1. Port 2. Starboard
MacElrevey 14-15 The correct answer is: Number one Port
A bow thruster is sometimes preferable to tugs because? 1. It is located at the extreme end of the vessel 2. It is always available 3. It is equally effective at slow and fast speeds
MacElrevey 15-16 The correct answer is: Number 1 It is located at the extreme end of the vessel and Number 2 It is always available
Using a bow thruster has its disavantages: 1. It usually provides less power than a tug 2. It has no effect on headway to slow or hold a ship 3. It can only be used at very light drafts
MacElrevey 15-16 The correct answer is: Number 1 It usually provides less power than a tug and Number 2 It has no effect on headway to slow or hold a ship
A bow thruster is usually quite effective at speeds up to 5 knots.
MacElrevey 15-16 The correct answer is: False
When a ship moves from deep to shallow water; the tactical diameter. 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 1 increases
When a ship moves from deep to shallow water; twisting effect when backed 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 1 increases
When a ship moves from deep to shallow water; the rate of turn 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 3 no significant change
When a ship moves from deep to shallow water; speed loss during a large course change 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 2 decreases
When a ship moves from deep to shallow water; the speed loss when the engine is stopped 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 2 decreases
When a ship moves from deep to shallow water; the directional stability. 1. increases 2. decreases 3. no significant change
MacElrevey 17-20 The correct answer is: Number 1 increases
How would you expect the following to affect directional stability: Increased length 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 1 more positive (or less negative)
How would you expect the following to affect directional stability: Increased beam. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 2 less positive (or more negative)
How would you expect the following to affect directional stability: Increased drag. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 1 more positive (or less negative)
How would you expect the following to affect directional stability: Decreased UKC. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 1 more positive (or less negative)
How would you expect the following to affect directional stability: Increased Cb. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 2 less positive (or more negative)
How would you expect the following to affect directional stability: More full sections forward. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 2 less positive (or more negative)
How would you expect the following to affect directional stability: Increased Rudder Angle. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 3 no significant change
How would you expect the following to affect directional stability: Ship Trimmed by the Head. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 2 less positive (or more negative)
How would you expect the following to affect directional stability: Increased Squat by the Head. 1. more positive (or less negative) 2. less positive (or more negative) 3. no significant change
MacElrevey 18-20 The correct answer is: Number 2 less positive (or more negative)
Ships with large block coefficients are more likely to trim by the head in shallow water.
MacElrevey 19 The correct answer is: True
Which of the following statements is/are true for ships with negative directional stability. 1. A larger rudder angle is needed for a longer period of time to start a turn 2. A larger rudder angle is needed for a longer period of time to steady up after a turn 3. The ship’s rate of turn increases when the rudder is put amidships during a turn
MacElrevey 18-20 The correct answer is: Number 2 A larger rudder angle is needed for a longer period of time to steady up after a turn and Number 3 The ship’s rate of turn increases when the rudder is put amidships during a turn
The only effective way to slow a ship is to stop the engine and, if necessary, go astern?
MacElrevey 24-26 The correct answer is: False
A VLCC makes a hard-over turn. You would expect her to lose nearly percent of her headway when her heading changes by 90 degrees.
- 10
- 20
- 25
- 50
MacElrevey 25 The correct answer is: Number 3 25
A ship is on your port bow in a crossing situation and her bearing is steady. You reach the point where you doubt collision can be avoided by her actions alone. Usually, it would be better to…
- Back down
- Make a round turn
MacElrevey 25-26 The correct answer is: Number 2 Make a round turn
A combination pilot ladder/accommodation ladder is required when the distance from the water to the top of the ladder exceeds feet.
- 10
- 20
- 30
- 50
MacElrevey 29 The correct answer is: Number 3 30
Modern containership has more sail area than a full rigged sailing ship.
MacElrevey 34 The correct answer is: True
The ship’s call letters should be transmitted frequently when communicating by VHF and, in any case, at intervals of 1. before and after every transmission during a series of transmissions with another ship 2. at ten minute intervals 3. before the first transmission and after the last transmission of a VHF converstaion regardless of length
MacElrevey 36-37 The correct answer is: Number 2 at ten minute intervals and Number 3 before the first transmission and after the last transmission of a VHF converstaion regardless of length
Mariners have several means for communicating ship’s actions and intentions including. 1. Verbal communications such as VHF radio 2. Graphic communications such as CTANS and interactive DGPS 3. Radar and ARPA 4. Whistle Signals
MacElrevey 36-39 The correct answer is: Number 1 Verbal communications such as VHF radio and Number 4 Whistle Signals
To break a sheer in narrow channels a pilot should? 1. Reduce engine RPM 2. Increase engine RPM 3. Turn away from the bank and increase distance 4. Increase rudder towards the bank
MacElrevey 47 The correct answer is: Number 2 Increase engine RPM and Number 4 Increase rudder towards the bank
Your vessel is steaming parallel to a shoal or bank. Her bow moves away from the shoal or bank.
MacElrevey 47-48 The correct answer is: True
Your vessel is steaming parallel to a shoal or bank. Her stern moves towards the bank or shoal?
MacElrevey 47-48 The correct answer is: True
Your vessel is steaming parallel to a shoal or bank. Her midbody moves laterally away from the bank.
MacElrevey 47-48 The correct answer is: False
Competent shiphandlers don’t just react to the ship’s behavior and decide on a course of action after a situation develops; they think ahead, anticipate situations, and plan alternative maneuvers.
MacElrevey 49 The correct answer is: True
Ships with variable pitch propellers steer best if speed is reduced quickly.
MacElrevey 52 The correct answer is: False
Advantages of omnidirectional propulsion systems over conventional systems include 1. Greater safety 2. increased maneuverability 3. reduced reliance on traditional shiphandling skills
MacElrevey 53 The correct answer is: Number 1 Greater safety and Number 2 increased maneuverability
Ship handlers should reevaluate any maneuver requiring the repeated use of half or full power.
MacElrevey 55 The correct answer is: True
When steering using azipods in the At Sea mode the pod is turned to port to turn the ship to starboard.
MacElrevey 61 The correct answer is: True
Using azipods, when is the at sea mode is used? What is their orientation?
MacElrevey 61-63 In open waters. Units parallel to the centerline of the vessel.
Using azipods, when is the Harbor mode is used? What is their orientation?
MacElrevey 61-63 In narrow channels. The units set at a 45 degree angle away from the centerline.
Using azipods, when is the Docking mode is used? What is their orientation?
MacElrevey 61-63 Used in approaching berths. The inboard unit is parallel to the dock, the outboard unit athwartships.
When operating in the 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.
MacElrevey 62 Starboard, Port
When in Docking Mode and going port side to the berth, the pod is placed parallel to the centerline, and the pod is placed in the 3 o’clock position with the propeller .
MacElrevey 62-63 Port, Starboard, Outboard
When researching various methods for standardizing azipod commands, some pilot groups found it worked well to use… 1. Standard steering and engine commands in the At Sea mode 2. standard steering and engine commands in the Harbor and Docking modes 3. clock positions and percentage of power for all modes 4. clock positions and percentage of power for Harbor and Docking modes
MacElrevey 63-64 The correct answer is: Number 1 Standard steering and engine commands in the At Sea mode and Number 4 clock positions and percentage of power for Harbor and Docking modes
When operating under computer control, the shiphandler is controlling? 1. revolutions per minute of the pod and thruster and direction of the thruster and pod forces 2. resultant power, speed, and vessel movement
MacElrevey 65 The correct answer is: Number 2 resultant power, speed, and vessel movement
Experienced mariners limit the use of computer control when maneuvering near docks and fixed objects. A good rule of thumb is to change from automatic to manual control when within of a hazard 1. three ship lengths 2. 100 feet 3. one ship length
MacElrevey 66 The correct answer is: Number 3 one ship length
Standardized commands for maneuvering azipod vessels are important because. 1. Lack of standard commands makes it impossible to follow recommended BRM practices. 2. Lack of standard commands makes it necessary to have a single person both conning and controlling engine and thruster movements 3. Pilots and deck officers lose situational awareness when standard commands and conning practices are not used 4. The pilot cannot fulfill requirements under law to control the vessel or provide sufficient controls to be held responsible for maneuvering in many situations without standardized commands
MacElrevey 67-70 The correct answer is: All Of The Above
The tactical diameter is when the object moves ahead relative to the shipboard reference point. 1. increasing 2. decreasing
MacElrevey 75-77 The correct answer is: Number 2 decreasing
The rate of turn is if the object moves ahead more rapidly. 1. increasing 2. decreasing
MacElrevey 56 The correct answer is: Number 2 decreasing
It is best to overtake and pass close by another ship in a narrow channel at very slow speed, while the overtaken ship should increase her speed before being passed.
MacElrevey 80 The correct answer is: False
The clicking sound made by the gyro compass should be eliminated as it distracts the pilot.
MacElrevey 81 The correct answer is: False
A rate-of-turn indicator usually indicates turning rate in per second or per minute. 1. meters/feet 2. tenths of a degree/degrees 3. degrees/degrees 4. feet/feet
MacElrevey 83 The correct answer is: Number 2 tenths of a degree/degrees
The change in mean draft is know as? 1. Sinkage 2. Squat 3. Trim
MacElrevey 85 The correct answer is: Number 1 Sinkage
Hull rotation about the transverse axis and resulting change in draft forward or aft is known as? 1. Sinkage 2. Squat 3. Trim
MacElrevey 83 The correct answer is: Number 3 Trim
The increase in deep draft forward or aft is called? 1. Sinkage 2. Squat 3. Trim
MacElrevey 83 The correct answer is: Number 2 Squat
The increasing pressure drop under a hull and the corresponding increase in squat caused by water flowing under the hull at increased velocity as the ship’s speed increases is due to what principle?
MacElrevey 85 Bernoulli’s
Ships always trim by the stern in shallow water.
MacElrevey 90-91 The correct answer is: False
The pilot or ship’s officer can reduce sinkage and squat by reducing the…. 1. block coefficient 2. speed 3. blockage factor 4. the rate and period of acceleration
MacElrevey 96-97 The correct answer is: Number 2 speed and Number 4 the rate and period of acceleration
Squat for a given speed and hull condition in confined water is that in open water. 1. half 2. twice
MacElrevey 87-88 The correct answer is: Number 2 twice
What is the standard formula for Squat
MacElrevey 87-88 S = Cb x V2 / 30 Where: S = Speed Cb = Block Coefficient V2 = Knots
UKC is influenced by several factors including. 1. Vessel Speed 2. Channel Dimensions 3. Changes in Engine Revolutions 4. Vessel Interaction
MacElrevey 95 The correct answer is: All Of The Above
How much is UKC is reduced when two ships pass in a narrow channel because squat increasing dependant on ship speed and distance of separation?
MacElrevey 95-98 50 - 100 or more%
UKC is reduced significantly as a ship accelerates and squat increases as much as %.
MacElrevey 95-97 You could have answered with any of the following: 1. 100 2. one hundred
On wide beam ships rolling may have more effect on UKC than squat.
MacElrevey 95 The correct answer is: True
Changes in the shape of the channel have no effect on squat so long as the blockage factor does not change.
MacElrevey 95-98 The correct answer is: False
A tug being used for ship work can only be used to move a ship’s bow or stern laterally?
MacElrevey 106 The correct answer is: False
You are docking a ship using two tugs. You have the quarter tug stand off until just before the ship enters the slip. Give two reasons for this.
MacElrevey 108 1. The after tug acts as drag, reducing the effectiveness of the rudder, especially at slow speeds when the shiphandler is trying to move the stern laterally without any increase in speed. 2. The stern tug tends to set the stern away from the side on which she is made fast. This effect increases the angle at which the tug lies to the ship increases, since the tug is acting as a rudder of the dimentions of the tug’s underwater profile.
What is the signal for increase to full power?
MacElrevey 105 Series of short, rapid blasts.
What is the signal for tug dismissed. Let go?
MacElrevey 105 On long, two short.
What is the signal for if working, stop?
MacElrevey 105 One blast.
What is the signal for if pushing, increase power.
MacElrevey 105 Series of short, rapid blasts.
What is the signal for come ahead, dead slow.
MacElrevey 105 One long blast.
What is the signal for back the tug, normal power?
MacElrevey 105 Two blasts