A.size of the heat sink
B.temperature difference between the regions
C.size of the heat source
D.total heat of the system
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A.the four-way control valve failing to shift
B.the bleeder valve sticking in the open position
C.cold hydraulic fluid
D.a clogged air vent falter on the oil reservoir
A.add fluid that is the same color as the fluid in the reservoir
B.add turbine oil because it is always a good substitute
C.add any oil that has the same viscosity as the hydraulic fluid
D.check the winch manufacturers instruction book
A.changing the angle of the tilting plate
B.changing the speed of the pump
C.moving the slide block and rotor
D.moving the shaft trunnion block
A.oil foaming in the compressor
B.higher than normal suction and discharge pressures with a higher box temperature
C.higher than normal discharge pressure with a normal box temperature
D.the compressor to run continuously
A.check hydraulic oil levels every hour
B.check the rams for overheating
C.check for excessive oil leakage from rams
D.drain water from telemotor cylinders each watch
最新試題
The usual symptoms of cavitation in a centrifugal pump is ().
A salinity indicator is used to determine the ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
Which of the following statements is correct concerning heat transfer?()
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().