單項選擇題The term "pour point" is defined as the lowest temperature at which lubricating oils will flow ().

A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second


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2.單項選擇題What is a function of the wearing rings used in most centrifugal pumps?()

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the discharge side from the suction side
D.Dampen the turbulent discharge flow

4.單項選擇題Which of the following descriptions best identifies the operating principal of a flash-type evaporator?()

A.Sea water is heated to boiling temperature while under a vacuum
B.Sea water is passed over heated plates in a thin film
C.Heated sea water is injected into a vacuum chamber
D.Sea water is forced through a heated eductor

5.單項選擇題Which of the listed conditions can lead to cavitation氣穴in a centrifugal pump?()

A.Vapor pockets formed in the suction flow stream
B.Rough easing volute surfaces
C.Worn wearing rings
D.Heavy fluid in the flow stream