A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
您可能感兴趣的试卷
你可能感兴趣的试题
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
A.Variable volumes can be obtained with gear pumps only by variation of the pump drive speed
B.A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C.The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
D.All of the above
最新试题
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
The output volume of a positive fixed displacement pump can be changed only by ().
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 general purpose of a heat exchanger is to ().
The major source of chemical contaminants in hydraulic fluid is ().
A pressure drop through the refrigerant liquid line may cause ().
A salinity indicator is used to determine the ().