The propeller is pushed on to the tubeshaft taper and made tight by（）

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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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• The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）

  A . for FP, once fitted, the position of the blades can also be changed in operation B . for CP, once fitted, the position of the blades can also be changed in operation C . the CP type has a relatively smaller hub compared with the FP propellers D . the FP type has a relatively larger hub compared with the CP propeller

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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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• Upon underwater detection，there were no apparent defects on the bottom plates，bilge keels，rudder and propeller of the said vessel.This kind of wording usually appeared on（）.

  A . ship surveyor's report B . a ship's certificate C . a cargo inspection report D . a diver survey report

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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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• In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.

  A . a basket B . a black ball C . a black cone D . two black cone

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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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• 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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• Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.

  A . apparent slip B . tree slip C . pitch D . propulsive efficiency

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• Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）.

  A . back current from the rudder B . greater pressure on the right or left side of the propeller，depending on rotation C . lower pressure on the right or left side of the propeller，depending on rotation D . torque from the velocity and angle at which the surrounding water impinges upon the propeller blade

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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 material used extensively as electrolytic protection around bronze propellers is（）.

  A . brass B . copper C . lead D . zinc

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• Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

  A、An alternator B、An electric motor C、A diesel engine D、A main switchboard

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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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• In any case the draught of the vessel at the（）shall not be less than that which is necessary to obtain full immersion of the propeller.

  A . forward perpendicular B . amidships C . longitudinal center of floatation D . after perpendicular

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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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• Upon underwater detection, there were no apparent defects on the bottom plates, bilge keels,rudder and propeller of the said vessel. This kind of wording usually appeared on（）.

  A . ship surveyor's report B . a ship's certificate C . a cargo inspection report D . a dive survey report

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• In some Scottish villages, barrels of _____ are set on fire and pushed through the streets to symbolize the end of the “Old Year”.

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• Is pushing on the last lap legal? Here the last lap means （ ）

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• Which of the following has “ push ” with the same meaning and usage as that in “ The White House is push for an agreement by the end of February ” ？

  A．It didn ’ t move,so she pushed harD B．He was pushing hard for welfare reform． C．He ’ s been pushing himself too hard,working 12-hour days． D．The law would push even more children into poverty．

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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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• In any industry in which repeat business is done with the same parties, there is always a balance between pushing the limit on any particular negotiation and making sure the other party—and your relat

  是 否

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• 11、螺旋桨位于机头还是机尾，对飞机的航向静稳定性没有影响。 Whether the propeller is located at the nose or the tail has no effect on the directional static stability.

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