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
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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
A.stored at temperatures below 60 degrees Fahrenheit
B.charged into a system having copper fittings
C.allowed to mix with compressor oil
D.exposed to an open flame or hot surface
A.acid formation
B.sludge formation
C.ice in the expansion valve
D.All of the above
A.superheated outside the system
B.in contact with an open flame
C.heated to the boiling point
D.All of the above
最新试题
A salinity indicator is used to determine the ().
Which of the listed pumps is NOT a positive displacement pump?()
The rate of heat transfer from a hot region to a cold region is affected most by the ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
Low compressor head pressure in a refrigeration system can be caused by().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().