improper venting of the cooling system
carrying the expansion tank water level too high
a totally clogged impeller in the cooling water pump
an incorrectly set cooling system temperature control
第1题：
Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.
A.increase power output
B.decrease lube oil viscosity
C.eliminate fuel knock
D.cause sulfuric acid formation
第2题：
a broken shaft on the freshwater pump
an excessive accumulation of scale exchanger
an incorrect thermostatic element operating range
lube oil in the cooling water
第3题：
What is head tank in the closed cooling water system used for?
A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above
第4题：
fresh water expansion tank
sea water expansion tank
thermostatic expansion valve
jacket water cooler accumulator
第5题：
for the release of air from the cooling water
providing expansion room for heated cooling water
a place for implementing water and water treatment agent
all of the above
第6题：
Which of the following accurately describes the meaning of redundant cooling？（）
第7题：
60 to75
80 to 95
100 to 115
120 to 135
第8题：
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.
A.suction pressure regulator
B.thermostatic bypass valve
C.sea water temperature
D.water level in the expansion tank
第9题：
is made to circulate out of the system
is made to circulate within the system
is made circulate within the system
is made circulate out of the system
第10题：
a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
two medium-speed, turbocharged, four-stroke diesel engines
a variable-speed AC generator