A.saltwater heater shell
B.second-stage condenser
C.atmosphere
D.second-stage flash chamber
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A.Ash content, carbon residue, and gravity
B.Viscosity, acidity, and demulsibility
C.Pour point, flash, point, and precipitation number
D.Auto-ignition point, viscosity index, and film strength
A.Protects against suction valve float
B.Provides a positive pressure on the air inlet valves
C.Prevents lubricating oil contamination of the compressed air supply
D.Protects against the damaging effects of airborne solid particles
A.warm-up allows the hydraulic system to become charged with oil
B.warm-up allows the relief valves to be properly tested
C.hydraulic strainers operate only during the warm-up period
D.hydraulic fluid must be at the proper viscosity
A.are exposed to a vacuum
B.come in contact with extremely hot surfaces
C.are reduced in temperature to just above the pour point
D.become extremely agitated or aerated
A.weight
B.internal friction
C.demulsibility
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
最新试题
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
Low compressor head pressure in a refrigeration system can be caused by().
The general purpose of a heat exchanger is to ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
A salinity indicator is used to determine the ().