Vessel Handling in Rivers and Estuaries Flashcards
The pivoting point of a vessel going ahead is
a. at the hawsepipe
b. about one-third of the vessel’s length from the bow
c. about two-thirds of the vessel’s length from the bow
d. near the stern
b. about one-third of the vessel’s length from the bow
When underway and proceeding ahead, as the speed increases, the pivot point tends to _________
a. move aft
b. move forward
c. move lower
d. remain stationary
b. move forward
The distance gained in the direction of the original course when you are making a turn is known as ____
a. advance
b. drift
c. tactical diameter
d. transfer
a. advance
In relation to the turning circle of a ship, the term “advance” means the distance___________
a. gained at right angles to the original course
b. gained in the direction of the original course
c. moved sidewise from the original course when the rudder is first put over
d. around the circumference of the turning circle
b. gained in the direction of the original course
Generally, you can best keep a vessel under steering control when the vessel has ________
a. headway
b. sternway
c. no way on, with engines stopped
d. no way on, with engines full ahead
a. headway
The forward movement of a vessel in one revolution of its propeller is measured by _______
a. advance
b. head reach
c. the pitch
d. transfer
c. the pitch
As the propeller turns, voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency, pitting of the blades, and vibration. These voids are known as ________
a. advance
b. cavitation
c. edging
d. slip
b. cavitation
The effect of wind on exposed areas of the vessel is most noticeable when ________
a. backing
b. going slow ahead
c. going full ahead
d. turning
a. backing
A wedge of water building up between the bow and nearer bank, which forces the bow out and away, describes _________
a. bank cushion
b. bank suction
c. combined effect
d. bend effect
a. bank cushion
The effect known as “bank cushion” acts in which of the following ways on a single screw vessel proceeding along a narrow channel?
a. It forces the bow away from the bank
b. It forces the stern away from the bank
c. It forces the entire vessel away from the bank
d. It heels the vessel toward the bank
a. It forces the bow away from the bank
How does the effect known as “bank suction” act on a single-screw vessel proceeding along a narrow channel?
a. It pulls the bow toward the bank
b. It pulls the stern toward the bank
c. It pushes the entire vessel away from the bank
d. It heels the vessel toward the bank
b. It pulls the stern toward the bank
Two vessels are abreast of each other and passing port to port in a confined waterway. What should you expect as your bow approaches the screws of the other vessel?
a. Your speed will significantly increase
b. Your draft will significantly decrease
c. Your bow will sheer towards the other vessel
d. Your bow will sheer away from the other vessel
c. Your bow will sheer towards the other vessel
Which effect does speed through the water have on a vessel, which is underway in shallow water?
a. A decrease in the speed results in a decrease in steering response and maneuverability
b. An increase in speed results in the stern sucking down lower than the bow
c. An increase in speed results in the vessel rising on an even plane
c. A decrease in speed results in the vessel sucking down on a even plane
b. An increase in speed results in the stern sucking down lower than the bow
In order to reduce your wake in a narrow channel you should _____
a. apply enough rudder to counter the effect of the current
b. change your course to a zigzag course
c. reduce your speed
d. shift the weight to the stern
c. reduce your speed
For the deepest water when rounding a bend in a river, you should navigate your vessel _____
a. toward the inside of the bend
b. toward the outside of the bend
c. toward the center of the river just before the bend, then change course for the river’s center after the bend
d. in the river’s center
b. toward the outside of the bend
