A.The hose should not be twisted
B.The hose should be protected with a sleeve if it is subjected to rubbing
C.There should be some slack in the hose
D.All of the above
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A.acid
B.fuel oil
C.sediment
D.water
A.Main circulator pump jacket water cooling
B.Salt water service pump
C.Auxiliary condensate pump
D.Bilge pump
A.cause a loss of the liquid seal
B.create a vapor lock in the liquid receiver
C.collect in the condenser
D.cause foaming of the oil in the crankcase
A.only by the pump as its primary function
B.by resistance to the fluid flow through the system
C.by the thermal input to the systems fluid
D.solely by the charge applied by the accumulators
A.increase the flow of the cooling water through the condenser
B.adjust the high pressure cutout to maintain the desired pressure
C.open the hot gas bypass temporarily to reduce capacity
D.purge non-condensable gases to reduce the excess pressure
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Thermostatic expansion valves can be adjusted for （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
A grease gun is generally used to lubricate a （）.