A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open
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A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above
A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller
A.ignition temperature
B.flash point
C.flammable range
D.convection index
A.freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B.emulsify the oil in the condenser
C.freeze in the king valve
D.clog the oil trap
A.The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum
B.The amount of heated feed water discharged from the feed water heater after cndenser is increased
C.Fewer non-condensable gases are created by the flow of colder seawater
D.More seawater is allowed to pass through the flint stage overflow weir
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The general purpose of a heat exchanger is to （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
When the steering gear is in operation, you should （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
A salinity indicator is used to determine the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The major source of chemical contaminants in hydraulic fluid is （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.