A.aeration of the oil
B.contamination of the oil
C.pump cavitation
D.spongy actuator movements
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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
A.Centrifugal
B.Reciprocating
C.Gear
D.Rotary
A.a high suction head
B.rotating rings
C.badly worn bearings
D.a loose stuffing box gland
A.solenoid valve to seize
B.compressor to hunt
C.formation of flash gas in the liquid line
D.expansion valve to freeze open
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system
A.Thermal expansion valve frozen open
B.Suction gas heat exchanger bypassed
C.Condenser clogged or fouled
D.High pressure cutout switch inoperative
最新试题
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 rate of heat transfer from a hot region to a cold region is affected most by the ().
A salinity indicator is used to determine the ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()
Low compressor head pressure in a refrigeration system can be caused by().
The major source of chemical contaminants in hydraulic fluid is ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().