A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
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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
最新試題
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
The rate of heat transfer from a hot region to a cold region is affected most by the ().
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
A grease gun is generally used to lubricate a ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
Which of the listed pumps is NOT a positive displacement pump?()
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().