海船船员考试
单选题Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）A engine support vibration isolatorB detuner or viscous fluid damperC lightened crankshaft fl
题目
engine support vibration isolator
detuner or viscous fluid damper
lightened crankshaft flywheel
spherically seated crankshaft bearing
相似问题和答案
第1题：
The term "moderate speed" was previously interpreted（解释） as meaning a speed which would enable a vessel ______within half the range of visibility.
A.stopping
B.being stopped
C.to stop
D.to be stopped
第2题：
On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the ______．
A.minimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit
第3题：
For users, microkernel technology promises(90), compact and sophisticated operating systems that are typically(91)across a range of hardware platforms. These operating systems will be customizable to let users run multiple operating system and application "personalities" on top of a single microkernel(92).Microkernel based systems can provide this flexibility because the core operating system functions are(93)from the large number of utilities, features and extensions that are layered on top of them. As a result, updating and maintaining operating system is easier, since developers don't have to modify the(94)every time they must acid a new feature.
A．slow
B．fast
C．quickly
D．speed
第4题：
an isochronous governor
elastic engine mounts
a vibration damper
a cast iron bed plate with good flexible qualities
第5题：
运行区段 operating range
正确答案:反应堆在稳态条件下运行的反应堆功率范围。
第6题：
The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.
A.load limit settings
B.idle speed settings
C.speed limit settings
D.speed droop settings
第7题：
临界转速（critical speed）
正确答案:燃气轮机及其驱动设备的相关旋转轴系的固有频率。与轴系固有振动频率和强迫振动频率一致， 导致机组共振时对应的转速。
第8题：
When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .
A.pick up more of any increase in load
B.pick up less of any increase in load
C.share an equal amount of any increase in load
D.drop an equal amount of any decrease in load
第9题：
What is the most common cause of network congestion？（）
- A、aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switches
- B、speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environment
- C、flapping Ethernet interfaces caused by misconfigured LAN interfaces
- D、flapping serial interfaces caused by misconfigured WAN interfaces
- E、speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
正确答案:E
第10题：
caused by retarded injection timing
caused by a mechanical defect in one cylinder
caused by high fuel injection pressures
normal for these conditions