A.high pressure liquid line
B.low pressure liquid line
C.high pressure vapor line
D.low pressure vapor line
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A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed
A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed
A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above
A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above
A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open
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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最新试题
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
A salinity indicator is used to determine the ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
Low compressor head pressure in a refrigeration system can be caused by().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
A pressure drop through the refrigerant liquid line may cause ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
One cause of high head pressure occurring in a refrigeration system can be ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().