A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear
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A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating
A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure
A.When the helm is at any angle other than amidships
B.When the six-way valve is opened
C.When the ram relief valves lift
D.When the redder angle is different from the position of the helm
A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser
A.total head
B.discharge head
C.net positive suction head
D.suction head
A.slide block
B.tilting box
C.pintle
D.reaction ring
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other
最新试题
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
Which of the listed pumps is NOT a positive displacement pump?()
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
A salinity indicator is used to determine the ().
The major source of chemical contaminants in hydraulic fluid is ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
When the steering gear is in operation, you should ().
Low compressor head pressure in a refrigeration system can be caused by().