更多"Turbocharged four-stroke/cycle dies"的相关试题:
[单项选择]In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.
A. produce a scavenging effect in the combustion space
B. equalize cylinder and exhaust manifold pressures
C. alleviate the difference in valve size between the intake and exhaust
D. flush out condensate that collects after each compression stroke
[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity
[单项选择]A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.
A. temperature of the exhaust gases
B. energy supplied to the turbocharger
C. air pressure to the intake manifold
D. purge of exhausted gases from the cylinders
[单项选择]The exhaust system for a turbocharged diesel engine functions to （）
A. power the after-coolers
B. power the turbocharger
C. reduce the cylinder scavenge effect
D. cool the turbocharger
[单项选择]In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）
A. governor droop
B. speeder spring tension
C. fuel rack lag
D. load on the engine
[单项选择]After-cooling of a turbocharged diesel engine will result in （）
A. higher torque but lower brake horsepower
B. lower torque but higher brake horsepower
C. higher torque and lower brake horsepower
D. lower torque and higher brake horsepower
[单项选择]The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.
A. turbocharger stalls
B. exhaust pressure increases
C. air charge density decreases
D. scavenge effect increases
[单项选择]A turbocharged diesel engine will have an intake manifold pressure（）
A. constantly decreasing as engine load increase
B. constantly increasing as the amount of supercharging increases
C. approximately equal to exhaust manifold pressure at all times
D. approximately equal to atmospheric pressure at all times
[单项选择]An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）
A. exhaust
B. air box pressure
C. brake main effective pressure
D. all of the above
[单项选择]If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）
A. decrease until the engine speed increases
B. increase as the load increases
C. decrease as the load
D. increases remain unchanged
[单项选择]Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[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]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]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]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]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
[单项选择]Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A. a combination of constant volume and constant pressure
B. a combination of constant temperature and constant pressure
C. entirely constant pressure
D. entirely constant volume
