A.excessive water in the bilges
B.a clogged suction strainer
C.oil in the bilges
D.All of the above
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A.in the store room
B.in the cylinder
C.in the scavenge air box
D.in the water box
A.carry off
B.carry down
C.carry on
D.carry over
A.gravity
B.diameter
C.circumference
D.cylinder
A.displacement
B.weight
C.power
D.capacity
A.should be paved
B.should be cleaned
C.should be dismantled
D.should be welded
A.fulfill
B.eliminate
C.grease
D.bend
A.Condenser and thermal expansion valve
B.King and solenoid valves
C.Compressor and thermal expansion valve
D.Condenser and solenoid valve
A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over
A.increase
B.reduce
C.maintain constant
D.None of the above is true
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? ()
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water
A.(1)only
B.anyof(1),(2)and(3)
C.anyof(1)and(3)
D.anyof(1)and(2)
最新试题
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
One cause of high head pressure occurring in a refrigeration system can be ().
A salinity indicator is used to determine the ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
Which of the listed pumps is NOT a positive displacement pump?()
The general purpose of a heat exchanger is to ().
A pressure drop through the refrigerant liquid line may cause ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
The major source of chemical contaminants in hydraulic fluid is ().
Low compressor head pressure in a refrigeration system can be caused by().