更多"Medium speed engines have a （） powe"的相关试题:
[单项选择]The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.
A. forged
B. cast
C. made
D. shrunk
[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]Crankshafts of medium speed engines are （） from a single piece of steel.
A. unusually solid welded
B. never be solid forged
C. almost invariably solid forged
D. almost invariably be welded
[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]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]Which effect does speed through the water have on a vessel which is underway in shallow water （）.
A. A decrease in the speed results in a decrease in steering response and maneuverability
B. An increase in speed results in the stern sucking down lower than the Bow
C. An increase in speed results in the vessel rising on an even plane
D. A decrease in speed results in the vessel sucking down on an even plane
[单项选择]The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
A. quantity of air it takes in and retains in the cylinders during a given time period
B. proportion of trapped air that is utilized in the combustion process
C. thermodynamic efficiency of the engine cycle
D. all of the above
[单项选择]A power-driven vessel shall have her engine ready for（）when the visibility is restricted.
A. immediately stop
B. immediately maneuvering
C. immediately anchoring
D. immediately going astern
[单项选择]（） may have two emergency source of power, thus requiring two emergency switchboards.
A. Large passenger vessels
B. General cargo ships
C. Container ships
D. Oil tankers
[单项选择]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
A. apparent slip
B. tree slip
C. pitch
D. propulsive efficiency
[单项选择]The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A. two-stroke
B. four-stoke
C. long-stroke
D. short-stroke
[单项选择]A Doppler speed log indicates speed through the water（）.
A. at all times
B. in the bottom return mode
C. in the volume reverberation mode
D. only when there is no current
[单项选择]RAT电磁阀由谁供电（）
A. 电瓶或热电瓶汇流条
B. 直流电瓶汇流条
C. DCBUS1或DCBUS2
D. DCESSBUS
[单项选择]RAT的放出是如何实现的？
A. 通过两个电磁阀同时通电
B. 通过两个电磁阀
C. 只需通过两个电磁阀中的一个
[单项选择]液压系统RAT安装在：（）
A. 左主轮舱
B. 右主轮舱
C. 右机翼-机身整流罩
D. 左机翼-机身整流罩
[单项选择]RAT的释放是如何控制的?
A. 两个电磁活门同时有电时放出
B. 两个电磁活门中的任何一个有电时放出
C. 只有一个电磁活门在控制
D. 不确定
[单项选择]RAT的电磁活门是如何供电的?
A. 由电瓶或热电瓶汇流条供电
B. 由DC BAT BUS供电
C. 由DC BUS 1或2供电
D. 不确定
[单项选择]A Doppler speed log indicates speed over ground（）.
A. at all times
B. in the bottom return mode
C. in the volume reverberation mode
D. only when there is no current
