单项选择题

The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.

A.low viscosity index
B.high viscosity index
C.high neutralization number
D.low demulsibility quality

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单项选择题

Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）

A.Loss of suction
B.Increased clearances
C.Decreased clearance
D.Decreased slippage

单项选择题

The dew point of air is reached when the wet bulb temperature is （）.

A.Twice the dry bulb temperature
B.10℃ above the dry bulb temperature
C.5℃ above the dry bulb temperature
D.Equal to the dry bulb temperature

单项选择题

Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）

A.Production of high salinity distillate
B.Seawater feed temperature below 165℃
C.A leak in the first stage demister
D.A cracked distillate pump vent line