更多"Because the castings of smaller eng"的相关试题:
[单项选择]Smaller engines can be made more rigid than large ones and may not have （）.
A. connecting rods
B. crankshaft
C. crankcase
D. through bolts
[单项选择]We（）the cook because her cooking was so poor.
A. dismissed
B. deserted
C. resigned
D. withdrew
[单项选择]The four-stroke cycle is so called because it takes （） to complete the processes needed to convert the energy in the fuel into work.
A. two strokes of the piston
B. four strokes of the piston
C. one revolution of the crankshaft
D. four revolutions of the crankshaft
[单项选择]Because the tie bolts are so close to the crankshaft, some engines employ （）to hold the crankshaft main bearing cap in position instead of conventional studs and nuts.
A. through bolts
B. jack bolts
C. tap bolts
D. fitted bolts
[单项选择]Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）
A. filtering
B. centrifuging
C. depositing
D. operating
[单项选择]Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A. camshaft beatings
B. main bearings
C. piston crowns
D. cylinder walls
[单项选择]Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.
A. the piston rods
B. the crank throws
C. the thrust bearings
D. the main bearings
[单项选择]On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.
A. slow
B. quick
C. arranged
D. high
[单项选择]Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.
A. crown and skirt
B. liner and jacket
C. ring and groove
D. jacket and block
[单项选择]Vessels having main engines arranged for air starting are to be provided with at least （）
A. one automatic drain serving both containers
B. two air starting containers of approximately equal size
C. one control air container and one starting air container
D. one additional means of starting the main engine
[单项选择]Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）
A. increase blow-by in all cylinders
B. incomplete combustion in all cylinder
C. overloading in all cylinders
D. insufficient fuel delivery to all cylinders
[单项选择]Critical speed in diesel engines occurs when engine torque pulsations become （）
A. opposed to the crankshaft rocking couple
B. resonant with the crankshaft natural frequency
C. critical fore and aft crankshaft vibrations
D. horizontal whipping motions of the crankshaft
[单项选择]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A. inefficiency
B. oiliness
C. detergency
D. purity
[单项选择]For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
A. moving the governor control to stop
B. shutting off the lubricating oil supply
C. tripping the governor emergency stop lever
D. shutting off the fuel supply
[单项选择]Directional intake ports in diesel engines are used to （）.
A. reduce air charge turbulence
B. induce air swirl
C. deflect hot combustion gas away from the valves
D. oppose the effects of piston induced squish
[单项选择]All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.
A. 2 minutes
B. 3 minutes
C. 4 minutes
D. 5 Minutes
[单项选择]You are backing on twin engines with rudders amidships，when your port engine stalls.To continue backing on course，you should（）.
A. Apply left rudder
B. Apply right rudder
C. Increase engine speed
D. Keep your rudder amidships
