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
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
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 （）.
When the steering gear is in operation, you should （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the following statements is correct concerning heat transfer?（）
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.