更多"Because of the close tolerances use"的相关试题:
[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]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]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]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]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]Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A. burned exhaust valves
B. excessive spring compression
C. spring surge
D. worn valve seats
[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]Connecting rods in a diesel engine are used to connect the （）.
A. engine to the bed
B. rocker arm to the camshaft
C. crankshaft to the gear train
D. piston to the crankshaft
[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]Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.
A. fuel/water separators
B. day tanks
C. injector test stand
D. fuel filters
[单项选择]Diesel engine jacket water is used in the distillation process as the （）.
A. coolant for the distillate
B. coolant for the brine cooler
C. means of heating the feedwater
D. primary means of producing a vacuum within the distiller
[单项选择]Cast iron pistons used in large propulsion diesel engines are constructed with （）
A. not taper what so ever
B. the skirt being tapered and smaller than the crown
C. the skirt being tapered and larger than the crown
D. the crown being tapered and smaller than the skirt
[单项选择]Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.
A. performance
B. horsepower output
C. fuel consumption
D. scavenge effect
[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]Lubricating oil used in a diesel engine serves to（）
A. reduce the wear of bearing surfaces
B. cool the bearing surfaces
C. assist in sealing bearing surfaces
D. all of the above
[单项选择]Diesel engine exhaust temperatures may be used to indicate （）.
A. leaking exhaust valves
B. an overloaded cylinder
C. a clogged injector nozzle
D. all of the above
[单项选择]Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.
A. two fuel oil transfer pumps provided where one is to be independent of the main engine
B. two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engine
C. engine driven transfer pumps and only used in constant speed applications
D. the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
