更多"Critical speed in diesel engines oc"的相关试题:
[单项选择]When attempting to restart a warm high-speed engine, which of the following reactions can you expect?（）
A. Excessive fuel
B. Higher than normal temperatures for star up
C. Longer starting periods
D. Higher than normal lube oil pressure
[单项选择]Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）
A. increasing the quantity of starting air
B. increasing the lube oil pressure
C. heating the engine fuel supply
D. heating the engine coolant
[单项选择]The over-speed trip installed on most diesel engine will stop the engine by shutting off the （）
A. water supply
B. fuel oil supply
C. lube oil supply
D. exhaust damper
[单项选择]When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）
A. remains the same
B. is reduced
C. is increased
D. is eliminated
[单项选择]The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A. principle
B. principal
C. cause
D. case
[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]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]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]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]A disadvantage of a four-stroke/cycle diesel engine is （）
A. higher working temperature of piston and cylinder
B. the use of scavenge ports
C. fewer power strokes per revolution of the crankshaft
D. part of the fuel is burned as the piston is moving away from top dead center
[单项选择]Due to excessive water in the fuel, a diesel engine fails to startBefore the engine can be started, the water must be removed from the （）.
A. fuel pumps
B. cylinders
C. fuel strainers
D. all of above
[单项选择]In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）
A. once every crankshaft revolution
B. once every two crankshaft revolutions
C. once every piston stroke
D. twice every piston stroke
[单项选择]The two strokes of a two-stroke/cycle diesel engine are （）
A. power and intake
B. intake and exhaust
C. exhaust and compression
D. compression and power
[单项选择]The diesel engine is similar to the gasoline engine in that （）.
A. both of them are ignited by compressed air
B. both of them are the forms of external combustion engines
C. both of them have spark plugs
D. the power is developed by the piston in the cylinder
[单项选择]Opposition occurs when（）.
A. the Sun，Earth，and Moon are at right angles
B. the Sun's declination is 0°and is moving south
C. an inferior planet is at the maximum angle to the line of sight to the Sun
D. the Earth is between a planet and the Sun
[单项选择]When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）
A. the amount of lube oil additives increase
B. piston speeds increase
C. injection pressure decrease
D. engine speeds decrease
[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]Superior conjunction occurs when（）.
A. the Sun is at maximum declination north or south
B. a planet crosses the external plane of the ecliptic
C. the Sun is between the Earth and a planet
D. two planets are in line
