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
您可能感興趣的試卷
你可能感興趣的試題
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
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
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?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
A grease gun is generally used to lubricate a （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.