单项选择题A diesel engine piston ring face is in direct contact with the ().

A.top of the ring groove
B.cylinder liner oil film
C.bottom of the ring groove
D.back of the ring groove


您可能感兴趣的试卷

你可能感兴趣的试题

1.单项选择题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a ().

A.loss of suction in the circulating pump
B.leak in the primary cooling system
C.broken raw water pump shaft
D.burned or cracked piston in one cylinder

2.单项选择题In a simple mechanical governor, the ().

A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod

3.单项选择题The ability of the governor to prevent fluctuations in engine speed is termed ().

A.sensitivity
B.stability
C.promptness
D.speed droop

4.单项选择题What is the function of the thrust bearing?()

A.Prevents lateral movement of the slow speed gear
B.Transmits propeller thrust to the hull
C.Keeps spring bearings in line
D.Prevents main reduction gear axial movement

5.单项选择题Lube oil filters remove contaminants more efficiently if the oil being filtered is ().

A.under high pressure
B.under low pressure
C.heated to reduce viscosity
D.cooled to increase viscosity

6.单项选择题Proper filtering and straining of fuel oil is important because the ().

A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil
D.dirty fuel will clog the intake air filter

7.单项选择题An automated diesel engine should normally shut down due to ()

A.low lube oil temperature
B.high ambient air temperature
C.low tube oil pressure
D.high exhaust system back pressure

8.单项选择题The minimum speed an engine must attain before ignition can occur depends upon ().

A.the type and size of the engine
B.the condition of the engine
C.ambient temperature
D.all of the above

9.单项选择题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because ().

A.it has a longer power stroke
B.more air gets into the cylinder each stroke
C.it develops twice as many power strokes at the same speed
D.higher combustion pressure is developed

10.单项选择题Lube oil cannot be efficiently filtered if its ().

A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs