A.drill holes through the heavy side of the impeller until it balances
B.weld counterweights to the light side of the impeller
C.remove metal from the heavy side by machining in a lathe
D.acid wash and serape the heavy side until it balances
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A.cause loss of hydraulic oil from the system
B.result in extreme damage to the pump
C.cause damage to the pump ff not continually drained from the pump casing
D.result in the system high side pressure to substantially drop off
A.saltwater heater shell
B.second-stage condenser
C.atmosphere
D.second-stage flash chamber
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
最新試題
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
The general purpose of a heat exchanger is to ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
The usual symptoms of cavitation in a centrifugal pump is ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
The major source of chemical contaminants in hydraulic fluid is ().
When the steering gear is in operation, you should ().
Low compressor head pressure in a refrigeration system can be caused by().