單項(xiàng)選擇題With reference to a rotary vane steering gear system, which one of the following statements is true?（）

A.The three moving vanes and the three fixed vanes form three pressure chambers
B.The three moving vanes and the three fixed vanes form six pressure chambers
C.The three moving vanes and the three fixed vanes form nine pressure chambers
D.The three moving vanes and the three fixed vanes form twelve pressure chambers


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1.單項(xiàng)選擇題With reference to rules governing steering gear, which one of the following rules is incorrect? （）

A.It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary
B.The auxiliary gear could be power operated in passenger ships
C.The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed
D.All moving parts of the steering gear must be guarded against any possible damage

2.單項(xiàng)選擇題With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）

A.Only one pump should be used at any time
B.The ship speed should be reduced to 70% of the normal
C.Watch keeping of the steering gear should be increased
D.Limitations of the steering gear should be logged but the bridge need not be informed

3.單項(xiàng)選擇題With reference to a radial piston pump, which one of the following statements is false?（）

A.Surrounding the fixed shaft is a hollow shaft
B.This hollow shaft carries radial bores
C.Each bore is fitted with a well-lapped plunger
D.There are always even numbers of bores

4.單項(xiàng)選擇題With reference to an axial piston pump, which one of the following statements is true?（）

A.The cylindrical barrel is coupled to the motor
B.The cylindrical barrel has an odd number of bores
C.The bores end in sockets
D.The sockets fit in the swash plate

5.單項(xiàng)選擇題With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock