更多"Some diesel engines are fitted with"的相关试题:
[单项选择]In some type of two-stroke engines, besides some small holes for(), starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the()
A. fuel valves;exhaust valve
B. exhaust valves;inlet valve
C. fuel valves;inlet valve
D. exhaust valves;fuel valve
[单项选择]Some diesel engines are supercharged with a ()
A. slam charger
B. turbocharger
C. fuel atomizer
D. fuel injector
[单项选择]Valve cages are used on some large diesel engines to ()
A. reduce wear on the valve stem
B. permit the use of alloy valve seat materials
C. reduce heat transfer from the valve seat
D. facilitate valve removal for servicing
[单项选择]Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear()
A. must churn the oil in the sump
B. is connected to the propeller shaft
C. is driven at the highest RPM
D. compensates for alignment variations between the engine and pinion gear
[单项选择]In some modern large diesel engines, which of the following is used as the support for the main bearings?()
A. Bedplate
B. Block
C. Base
D. Sump
[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]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
[单项选择]Improperly fitted piston rings in a diesel engine can cause()
A. excessive lube oil consumption
B. lower than normal lube oil temperature
C. higher than normal exhaust back pressure
D. excessive crankshaft end play
[单项选择]Pistons of marine medium speed diesel engines may be made of () in order to keep the weight down for balancing purpose at high speed.
A. lead
B. forged steel
C. alloy steel
D. aluminum alloy
[单项选择]Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the ().
A. wheelhouse control station
B. engine room control station
C. captains office
D. chief engineers office
[单项选择]If a diesel engines exhaust temperature is abnormally high, the cause could be()
A. too light of a load
B. injection timing is too early
C. overloading of the engine
D. too low of a compression ratio
[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