更多"With four-stroke engines, it takes "的相关试题:
[单项选择]In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
A. two crankshaft revolutions in a two-stroke/cycle engine
B. two power strokes in a two-stroke/cycle engine
C. one power stroke in a two-stroke/cycle engine
D. two piston strokes in a two-stroke/cycle engine
[单项选择]Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
A. improving cylinder scavenging
B. preheating the combustion chamber
C. reducing air charge density
D. preventing valve wear
[单项选择]In a four-stroke engines the camshaft rotates at （）.
A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed
[单项选择]Marine four-stroke diesel engines are mainly （）.
A. of crosshead type
B. of trunk piston type
C. of low speed type
D. all the above
[单项选择]Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A. less even torque
B. higher cylinder head temperatures
C. fewer power strokes per revolution
D. greater weight/size requirements
[单项选择]In the four-stroke engine, it takes （） to make one power stroke.
A. one propulsion
B. two propulsions
C. two revolutions
D. one revolution
[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
[简答题]Consequences of the Industrial Revolution
[单项选择]Advise you（）engines．
A. stop
B. to stop
C. stopping
D. stopped
[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]Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower
[单项选择]Auxiliary diesel engines can be automatically shut down as a result of （）
A. low lube oil temperature
B. low lube oil pressure
C. high exhaust temperature
D. high cooling water pressure
[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]Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A. air starters
B. carburetors
C. natural aspiration
D. air receivers
[单项选择]Diesel engines are considered safer than gasoline engines because（）.
A. they are more heavily built
B. the fuel used is less volatile
C. they can be easily reversed
D. they operate at a lower speed
[单项选择]Diesel engines driving alternators operating in parallel must maintain set frequency regardless of load changesThe governor characteristic used to accomplish this is known as （）
A. actuation
B. sensitivity
C. compensation
D. thrust shaft
[单项选择]For auxiliary engines the permissible overload is （） for one hour every twelve hours.
A. 10%
B. 15%
C. 20%
D. 25%
[单项选择]Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
A. entirely constant pressure
B. entirely constant temperature
C. a combination of constant volume and constant pressure
D. a combination of constant temperature and constant pressure
