A.aeration of the oil
B.contamination of the oil
C.pump cavitation
D.spongy actuator movements
您可能感興趣的試卷
你可能感興趣的試題
A.condensate pump ball bearing
B.main shaft bearing
C.main turbine bearing
D.diesel engine wrist pin bearing
A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature
A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability
A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products
A.increase the capacity of the coil
B.increase the superheat at the bulb
C.deliver more refrigerant to the coil
D.decrease the capacity of the coil
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Thermostatic expansion valves can be adjusted for （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the listed pumps is NOT a positive displacement pump?（）
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?（）
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.