单项选择题
While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.
A.change the expansion valve adjustment
B.readjust the water regulating valve to increase the flow of water
C.purge air from the condenser
D.clean the waterside of the condenser
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相关考题
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Air trapped in the hydraulic fluid of a steering system should be indicated by （）.
A.the pump over-speeding
B.an improper rudder response
C.bubbles in the sight glass
D.ram relief valves lifting -
单项选择题
Overgreasing of ball bearings installed on pumps will result in （）.
A.smoother pump operation
B.overheating of the bearing
C.reduced corrosion in the bearing
D.increased pump capacity -
单项选择题
The energy associated with molecules is known as （）.
A.kinetic energy
B.potential energy
C.mechanical energy
D.thermal energy
