单项选择题In a full flow type lube oil system, the bypass relief valve will lift due to ()

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil


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1.单项选择题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by ()

A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control

2.单项选择题A dirty lube oil strainer can result in()

A.crankcase
B.low lube oil temperature
C.excessive oil consumption
D.low bearing oil pressure

3.单项选择题Differential needle valves used in fuel injectors are directly closed by()

A.cam action
B.spring force
C.fuel oil pressure
D.firing pressure

4.单项选择题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?()

A.An open vent in the cooling system
B.A fouled sea chest
C.A restricted water passage in the engine
D.Air entrained in the cooling water

5.单项选择题Proper dispersion of fuel in a diesel engine cylinder is dependent upon the ()

A.injection pressure
B.shape of combustion space
C.turbulence in combustion space
D.all of the above

7.单项选择题Exhaust pyrometer readings provide an indication of the ()

A.effectiveness of water-cooled exhaust elbows
B.distribution of the load between engine cylinders
C.amount of fuel penetration into the engine cylinders
D.indicated horsepower of the engine cylinders

8.单项选择题Fuel oil discharged to the diesel engine cylinder is atomized at the ()

A.turbocharger
B.injection nozzle tip
C.carburetor
D.fuel oil pump

9.单项选择题Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the ()

A.fuel nozzle holders
B.exhaust value guides
C.engine cylinder liners
D.low temperature and a low viscosity

10.单项选择题Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?()

A.Baffle plates that have been bent during prior removal
B.Leaks in the cooler tube nest
C.Operating the engine while maintaining a high sea water outlet temperature
D.A punctured sea water strainer supplying cooling water to the heat exchanger

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