单项选择题An increased differential between the inlet and outlet of a strainer usually indicates the strainer is ()

A.holed
B.fouled
C.clean
D.dry


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1.单项选择题Trunk type diesel engine pistons are effectively cooled when heat is()

A.radiated through the engine block
B.transferred to water cooled cylinder walls
C.conducted through the piston crown
D.transferred to escaping exhaust gases

2.单项选择题Maintaining the proper fuel oil temperature will result in ()

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by

3.单项选择题Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as()

A.supercharging
B.scavenging
C.turbulence
D.swept volume charging

4.单项选择题Which of the following statements is correct concerning diesel engine cooling water systems?()

A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
C.At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers
D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

5.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

6.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

7.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

8.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

9.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

10.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