更多"When the normal compression ratio o"的相关试题:
[单项选择]When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke
[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]Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A. an increased flash point
B. higher lube oil pressures
C. an increased viscosity
D. lower lube oil pressures
[单项选择]A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
A. ignition lag
B. engine horsepower
C. lube oil system pressure
D. specific fuel consumption
[单项选择]What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?（）
A. increased carbon buildup
B. burning of intake valves
C. excessive firing pressures
D. increased fuel consumption
[单项选择]An over-speed trip stops a diesel engine when the engine （）
A. runs out of fuel
B. has low lubricating oil pressure
C. exceeds a set maximum speed
D. has high cooling water temperature
[单项选择]If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）
A. excessively late injection timing for each cylinder
B. incorrectly adjusted intake valve timing
C. incorrectly adjusted fuel injector
D. incorrectly adjusted intake valve clearance
[单项选择]Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A. decrease the time required between cleanings
B. removes all large and small foreign objects
C. ensure a positive flow of oil at all times
D. ensure that all lube oil has been treated twice
[单项选择]The breaking-up of fuel as it enters a diesel engine cylinder is known as（）
A. airification
B. vaporization
C. atomization
D. gasification
[单项选择]The intake ports of a two-strike/cycle diesel engine are opened and closed by the action of the （）
A. camshaft
B. piston movement
C. exhaust valves
D. vertical drive
[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 a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰnor Ⅱ
[单项选择]
In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）
A. increased horsepower
B. reduced efficiency
C. increased heat loss
D. lower cylinder pressures
[单项选择]In a diesel engine, when the fuel is injected into the cylinder,（）
A. the piston is just coming upward from the bottom dead center
B. the piston has moved about one-fifth of the way up
C. the piston has moved most of the way up and almost reached the TDC
D. the piston has just past the TDC
[单项选择]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.
A. thrust block
B. sounding rod
C. connecting rod
D. push rod
[单项选择]For a diesel engine, when the piston is at the （）, the clearance volume is the largest.
A. TDC
B. DTC
C. BDC
D. DBC
[单项选择]If a diesel engine rotates slowly when cranked, but does not fire, the（）
A. fuel control rack had admitted excessive fuel
B. engine speed does not match the fuel rack setting
C. engine has failed to reach its firing speed
D. starter pinion and ring gear contact is not correct
[单项选择]When a diesel engine compression pressure is checked, the indicator is connected to the （）
A. cylinder exhaust ports
B. injection line
C. cylinder indicator cock
D. banjo oiler line
