单项选择题Coolant can be lost from a diesel engine jacket cooling waster system by leakage from()

A.cylinder head cracks
B.piping joints
C.pump leaking
D.all of the above


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1.单项选择题Ring groove inserts are occasionally used on aluminum alloy piston to()

A.reduce the ring groove wear rate
B.seal against crankcase vapors
C.lessen the wear on aluminum part of the cylinder
D.allow for the greater expansion rate of aluminum

2.单项选择题A sudden drop in diesel engine cylinder compression pressure can be caused by()

A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves

3.单项选择题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?()

A.An alarm device with audible and visible signals is required for all cooling water systems
B.Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets
C.Each totally enclosed cooling system shall be provided with a suitable head tank
D.Drain cocks are to be provided at the lowest points of all cylinder water jackets

4.单项选择题High exhaust back pressure will result in an increase in ()

A.turbocharger efficiency
B.engine power output
C.carbon deposits on fuel injectors
D.cylinder scavenging

6.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

7.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

8.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

9.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

10.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