Test 1 Flashcards
When a vessel starts to sheer across a channel, which of the following would you NOT do?
A. Reduce speed.
B. Let the vessel’s head fall a few degrees off course across the channel.
C. Maintain some rudder angle toward the near bank.
D. Increase speed.
A. Reduce speed.
Which of the following statements is true about the behavior of a ship in a narrow channel?
A. The bow has a tendency to sheer to the nearer bank.
B. The stern has a tendency to move toward the nearer bank.
C. The vessel wants to move laterally towards the far bank.
D. When the ship is slowed, the rudder will gain some effectiveness.
B. The stern has a tendency to move toward the nearer bank.
Which of the following Italians is responsible for the principle that explains the behavior of a ship in a narrow channel?
A. Berlusconi
B. Bellini
C. Benigni
D. Bernoulli
D. Bernoulli
Bank suction, deftly applied, can be put to a shiphandler’s advantage in which of the following situations?
A. When making a turn, a bank can be put close enough to the quarter to cause the ship to sheer in the direction of the turn and thus make a turn she otherwise could not navigate.
B. To assist a ship to pass another vessel in a narrow channel.
C. To locate the center of a channel in times of limited visibility.
D. All of the above
D. All of the above
Which of the following statements is NOT true about the effect of tide and current when navigating in a channel?
A. A fair current helps the stern around a bend when it strikes the quarter so that the stern comes around at a greater rate.
B. A fair current assists the bow in turning because of the eddy currents reflected out of the bend and the lack of current on the bow on the point side of the bend.
C. A head current can be assist to large ships making a turn.
D. All of the above statements are true.
C. A head current can be assist to large ships making a turn.
What is a “freshet”?
A rapid rise in stream flow due to runoff from rain or snowmelt.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a _____________
A. submerged rock, not dangerous to navigation
B. sunken wreck, not dangerous to navigation
C. towed-under buoy
D. All of the above
C. towed-under buoy
Balanced spade rudders often will not steer when large rudder angles are used.
True
or
False
True
Which of the following statements is NOT true about propeller design?
A. When a right-hand propeller is going astern, the stern tends to walk to port.
B. The diameter of the turning circle for right and left turns is not affected by the direction of the propeller’s rotation.
C. Higher RPMs are required to get a good flow over the rudder at reduced speeds when the ship is fitted with a smaller diameter propeller.
D. All of the above statements are true.
B. The diameter of the turning circle for right and left turns is not affected by the direction of the propeller’s rotation.
A steam turbine ship increases revolutions more slowly than a diesel, and more care is necessary to keep the ship’s speed down while still controlling steering.
True
or
False
True
Which of the following statements is/are true about the relative merits of the handling characteristics of the standard fixed blade propeller and the variable pitch propeller?
A. The variable pitch propeller can go astern indefinitely.
B. Variable pitch propellers can change the direction of propulsion repeatedly without concern for exhausting the supply of starting air.
C. When approaching a berth, lock or pilot station, it is necessary to start slowing a variable pitch propeller sooner than would be necessary for a conventional propeller.
D. All of the above
D. All of the above
When in position and stopped at the berth at zero pitch, the variable pitch propeller is usually turning at high RPM.
True
or
False.
True
Which of the following is NOT an advantage of an omni-directional propulsion system?
A. A propeller is NOT required to transmit power to the propeller.
B. The terminology applicable to this system is not yet standardized.
C. Ships using the system are highly maneuverable.
D. The system is safer than some other propulsion systems because the engine does not have to be stopped and reversed to go astern
B. The terminology applicable to this system is not yet standardized.
Of the many modes available to the omni-directional system, which of the following is/are one of the “standard” modes?
A. Open Sea Mode
B. Harbor Mode
C. Docking Mode
D. All of the above
D. All of the above
Which of the following statements is NOT true about the similarities and differences between the “At Sea” and the other two modes of the omni-directional system?
A. In all modes, the steering and engine commands are given in the same manner as for conventional ships.
B. In the Harbor & Docking modes, the pods are positioned by degrees or clock positions relative to the bow.
C. Engine orders are given in percentage of power ahead or astern in the Harbor and Docking modes.
D. Another description for the Harbor Mode is the “bicycle mode.”
A. In all modes, the steering and engine commands are given in the same manner as for conventional ships.