Pressure drop in an operating hydraulic system is developed ______.
A. only by the pump as its primary function
B. by resistance to the fluid flow through the system
C. by the thermal input to the system's fluid
D. solely(单独地) by the charge applied by the accumulators
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Which of the listed problems could produce a high absolute pressure within a flash type evaporator？
A. production of high salinity distillate
B. seawater feed temperature below 165℃
C. a leak in the first stage demister
D. a cracked distillate pump vent line
Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy？
A. the hydraulic pumps
B. valves
C. hydraulic cylinders
D. hydraulic motors
Which of the problems listed could cause erosion of the expansion valve disks and seats？
A. Overcharging the system with refrigerant
B. Faulty compressor suction valve
C. Failure of the high pressure cutout
D. Flash gas formed in the liquid line
Mooring winch should be equipped with mechanical brakes which are capable of holding ______.
A. half the breaking strength of the mooring line
B. the full breaking strength of the mooring line
C. the maximum expected tension of the mooring line
D. 50% over the working tension of the mooring line
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