A right-handed propeller will cause the survival craft to（）.

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• The pitch ratio of a propeller is the mean pitch divided by （）.

  A . the propeller diameter B . the propeller radius C . the pitch angle D . the length of helix

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• The force exerted by a propeller which tends to throw the stern right or left is called（）.

  A . slip B . sidewise force C . rotational force D . thrust

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• To serve as a person in charge of transfer operations on board a self-propelled tanker，an individual must（）.

  A . hold a valid officer's license for inspected vessels B . be a certificated tankerman C . be 30 years old D . have a letter from the company stating his qualificatio

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• The distance that a ship moves forward with each revolutionof its propeller，if there is no slip，is called（）.

  A . advance B . head reach C . pitch D . transfer

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• The pitch of a propeller is a measure of the（）.

  A . angle that the propeller makes with a free stream of water B . angle that the propeller makes with the surface of the water C . number of feet per revolution the propeller is designed to advance in still water without slip D . positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without sli

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• Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.

  A . stuffing box B . propeller boss C . seacock D . stop-water

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• You are landing a single-screw vessel，with a right-hand propeller，starboard side to the dock.When you have approached the berth and back the engine，you would expect the vessel to （）.

  A . Lose headway without swinging B . Turn her bow toward the dock C . Turn her bow away from the dock D . Head into the wind，regardless of the side the wind is o

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• 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 . sli

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• When backing a motor propelled lifeboat (right-hand propeller) with the rudder amidships，the stern will back（）.

  A . straight B . to port C . to starboard D . None of the above

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• Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）

  A . inside micrometer B . feeler gauge and straight edge C . adjustable trammel D . sighting device

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• If you must land on a beach with an oar-propelled lifeboat through a heavy surf，the recommended method is to（）.

  A . keep the bow directly in toward the beach，and tow the sea anchor off the stern B . ride in on the back of a large breaker C . keep the bow into the seas with the sea anchor out over the bow，and row to meet the breaking waves D . head directly into the beach by staying between the crests of the wave

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• The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.

  A . alternator B . turbo-charger C . remote controller D . windla

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• A single-screw vessel going ahead tends to turn more rapidly to port because of propeller（）.

  A . discharge current B . suction current C . sidewise force D . thrust

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• A(n) （） is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller.

  A . erosion B . corrosion C . pitting D . dezincificatio

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• A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）.

  A . When dead in the water，it is often difficult to find the neutral position and slight headway or sternway may result B . When going directly from full ahead to full astern，there is complete steering control C . When the vessel has headway and the propeller is in neutral，there is no effect on rudder control D . When maneuvering in port，full ahead or astern power can usually be obtained without changing shaft RPM

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• The number of rowing oars that must be carried in a motor-propelled open lifeboat on a cargo vessel is（）.

  A . determined by the Master B . specified by the Coast Guard C . specified by the manufacturer D . None

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• Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）

  A . Slightly higher fuel consumption B . Lack of directional control when backing C . Inefficient at high shaft RPM D . Some unusual handling characteristic

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• A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.

  A . 3 knots in smooth water B . 6 knots in smooth water C . 3 knots in rough water D . 6 knots in rough water

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• When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.

  A . ahead direction B . astern direction C . right-handed D . left-handed

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• The propeller consists of a （）with several blades of helicoidal form attached to it.

  A . shaft B . boss C . wheel D . lever

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• DNA secondary structure is a right-handed double helix with a sugar phosphate backbone on the outside and paired bases (A-T, G-C) on the inside. Which of the following are true?

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• When standing on a ship and facing the bow, the right-hand side is called ______.

  A.the right side B.the port side C.the starboard side

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• Vessel propellers are classified as being right hand or left hand.A right hand propeller turns clockwise when viewed from______.

  A.the bow B.the stern C.the port side D.the starboard side

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• You are on a single-screw vessel with a right-handed propeller.The vessel is going full speed astern with full right rudder.The bow will swing ______.

  A.Quickly to port，then more slowly to port B.Probably to port C.Slowly to port，then quickly to starboard D.Probably to starboard

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