A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air
您可能感興趣的試卷
你可能感興趣的試題
A.dischargeendbeingsmallerthanthesuctionend
B.smallsizeofimpeller
C.lackofmovingparts
D.easeatwhichthewearingringsmaybechanged
A.fusion
B.vaporization
C.sublimation
D.condensation
A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction
A.weight designation
B.viscosity index
C.pour point
D.thermal change value
A.fusion
B.vaporization
C.condensation
D.sublimation
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the following statements is correct concerning heat transfer?（）
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.