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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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
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
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
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
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
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If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.