gravity
diameter
circumference
cylinder
第1题：
One of the most common causes of reduction gear failure is gear wear caused by scoring as a result of
A.surface fatigue of the gears
B.an inadequate lube oil film
C.plastic flow of the gears
D.fretting corrosion from water
第2题：
_______can cause oil flow from water outlet of the oil purifier.
A.Oil inlet valve opening too quickly
B.Oil temperature little higher than normal
C.Diameter of gravity disc too small
D.Viscosity of oil little lower than normal
第3题：
A.The location of the interface can be changed by exchanging the diameter of the gravity disc
B.A.larger diameter of gravity disc can cause the interface is far away from bow center
C.disc should not break the The diameter of gravity water seal
D.In practice, the use of nomogram is the best oA530 operation
第4题：
Oil is discharged from the impeller through the outlet
Gravity causes the oil to flow toward the discharge
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
The discharge capacity varies directly with the speed of the impeller
第5题：
What causes the lube oil pressure of the engine to drop ?
第6题：
For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _______.
A.bowl periphery
B.bowl center
C.upper surface
D.lower surface
第7题：
what is the use of a purifier ?explain the purpose of a gravity disc ?
第8题：
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is
A.seal water supply be cut off
B.make-up water supply be cut off
C.oil outlet valve closed or not open sufficiently
D.the flow rate of oil is too much
第9题：
What causes cavitation in a centrifugal pump ________．
A.Vapor pockets in the flow stream
B.Rough impeller surfaces
C.Worn wearing rings
D.Heavy fluid in the flow stream
第10题：
large size of oil globule
low temperature
high viscosity
high flow rate