the engines speed
the engines load
the fuel oil temperature
the fuel oil flow
第1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2题：
A dirty diesel engine oil filter element can best be detected by ______.
A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter
第3题：
A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with .
A.a high viscosity index
B.a low viscosity index
C.neutralize acids
D.resist oxidation at high temperatures
第4题：
regulate the fuel supply
maintain a constant fuel viscosity at the fuel valves
maintain efficient cooling
alter the fuel density
第5题：
visual inspection of the elements
the pressure drop across the filter
high lube oil sump temperature
decrease in oil viscosity from the filter
第6题：
Which of the following statements is correct regarding an oil with a high viscosity index?
A.A large change of viscosity occurs with a minor change in temperature
B.No change in viscosity occurs with any change in temperature
C.Very little change in viscosity occurs with a significant change in temperature
D.The viscosity of the oil increases with an increase in temperature
第7题：
temperature
pumping rate
pressure
heat
第8题：
Oil oxidation as a result of excessively high lube oil temperature, is harmful to a diesel engine Because
A.oil foaming will always occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed
第9题：
have a high viscosity index
mix readily with refrigerant
have a high freezing point
have a low pour point
第10题：
in order that
because of
in order to
owing to