更多"Excessively worn, or polished ends "的相关试题:
[单项选择]One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
A. casting interlocking components
B. welding plates to form sections for assembly
C. forging integral components
D. case hardening integral components
[单项选择]After changing out the fuel filters the diesel engine fails to restart, the most probable cause for this condition is a/an（）.
A. low compression
B. air-bound fuel system
C. improper spark
D. change in viscosity
[单项选择]While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）
A. the bearing had been overheated
B. water was present in the oil
C. the lube oil was not being properly filtered
D. the maximum allowable bearing pressure had been exceeded
[单项选择]How dose water enter the crankcase of a diesel engine?（）
A. Through the crankcase exhauster
B. As water vapor contained in blow-by
C. Demulsifying lube oil passing through the main bearings
D. Condensation from vapor formed in the expansion tank
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]If water is found in the crankcase of a diesel engine, the cause may be due to（）
A. a cracked cylinder head
B. a leaky cylinder head gasket
C. a cracked cylinder liner
D. any of the above
[单项选择]Of a kind of liquid is used to cool the diesel engine, it is invariably called （）
A. lubricant
B. coolant
C. combustion product
D. second refrigerant
[单项选择]In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
A. Bed plate
B. Column
C. Entablature
D. Tie rod
[单项选择]A connecting rod in a four-stroke/cycle diesel engine is subject to（）
A. tension load twice each crankshaft revolution
B. compression load during power and compression strokes
C. inertia load once every four crankshaft revolutions
D. bending loads at bottom and top dead center
[单项选择]Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
A. grinding the spare plunger to the barrel
B. replacing the plunger and the barrel
C. highly polishing both the plunger and barrel
D. replacing plunger only
[单项选择]Diesel engine mufflers or silencers reduce the engine exhaust noise by （）
A. passing the exhaust through long head pipes
B. diffusing exhaust vibrations through activated carbon baffles
C. increasing the exhaust gas velocity
D. reducing the exhaust gas velocity
[单项选择]In a four-stroke/cycle diesel engine, badly worn intake valve guides can cause excessive（）.
A. exhaust pressure
B. exhaust temperatures
C. cooling water temperatures
D. lube oil consumption
[单项选择]Worn main bearings in a diesel engine can result in （）
A. decreased compression pressure
B. increased lube oil pressure
C. lower lube oil temperature
D. excessive leakage past the piston rings
[单项选择]The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A. principle
B. principal
C. cause
D. case
[单项选择]Diesel oil may be used to cool （） of a diesel engine.
A. cylinders
B. exhaust valves
C. pistons
D. fuel valves
[单项选择]ENG1及ENG2的反推使用（）
A. ENG1用SYSA及SYSB
B. ENG2用SYSA及备用
C. ENG1用sysA及备用
D. ENG2用SYSA及SYSBC
[单项选择]Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A. operated manually once an hour
B. operated until the engine has started
C. placed into operation only at maximum load
D. adjustable to meet lubrication requirements
[单项选择]Diesel fuel vapors （）.
A. can not be ignited by a spark unless the vapor is in a confined space
B. are nontoxic in all concentrations
C. can not be ignited by a spark unless they are at their auto-ignition temperature
D. are heavier than air
[单项选择]An emergency diesel generator should automatically shut down in the event of （）
A. dangerous over-speeding
B. a loss of lube oil pressure
C. activation of the fixed CO2 system for the emergency generator space
D. all of the above
