A.weight
B.internal friction
C.demulsibility
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A.Extensive centrifuging
B.Wax content
C.Water content
D.Acid content
A.Viscosity will increase as temperature increases
B.Viscosity is a measure of a fluid s internal resistance to flow
C.Viscosity will decrease as temperature decreases
D.Viscosity is not dependent on temperature
A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear
A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating
A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Thermostatic expansion valves can be adjusted for （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.