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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 isolator
B
detuner or viscous fluid damper
C
lightened crankshaft flywheel
D
spherically seated crankshaft bearing
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更多 “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 flywheelD spherically seated crankshaft bearing” 相关考题
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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．slowB．fastC．quicklyD．speed
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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 loadB.pick up less of any increase in loadC.share an equal amount of any increase in loadD.drop an equal amount of any decrease in load
考题
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.stoppingB.being stoppedC.to stopD.to be stopped
考题
The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.A.load limit settingsB.idle speed settingsC.speed limit settingsD.speed droop settings
考题
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 lineB.critical displacement lineC.critical dilution lineD.upper threshold limit
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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 switchesB、speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environmentC、flapping Ethernet interfaces caused by misconfigured LAN interfacesD、flapping serial interfaces caused by misconfigured WAN interfacesE、speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
考题
单选题The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.A
an isochronous governorB
elastic engine mountsC
a vibration damperD
a cast iron bed plate with good flexible qualities
考题
单选题The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.A
caused by retarded injection timingB
caused by a mechanical defect in one cylinderC
caused by high fuel injection pressuresD
normal for these conditions
考题
单选题Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.A
higher；reducedB
higher；increasedC
lower；reducedD
lower；increased
考题
单选题The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel （）within half the range of visibility.A
stoppingB
being stoppedC
to stopD
to be stopped
考题
单选题When the vessel on the full speed ahead, if full astern immediately （） the main engine start astern and fuel injection.A
after the thrust power is zeroB
after the torsion is zeroC
surpass the critical point on the water turbo phaseD
after the speed is zero
考题
单选题The device used to limit engine torque at various engine speeds is called a （）A
speed limiting governorB
variable speed governorC
constant speed governorD
load limiting governor
考题
单选题What is TRUE when operating in fog and other vessels are detected by radar?（）A
you should make an ample change to port for a vessel crossing on the starboard bowB
You should maneuver in ample time if a close-quarters situation is developingC
You should determine the course and speed of all radar contacts at six minutes intervalsD
Long-range scanning will provide early warning of all other vessels within the radar’s range
考题
单选题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 loadB
pick up less of any increase in loadC
share an equal amount of any increase in loadD
drop an equal amount of any decrease in load
考题
单选题Which of the following network modifications should be implemented to extend the wirelessnetwork range and allow out-of-range users to share the Internet connection?（）A
Create a new VLAN for the out-of-range users.B
Add a wireless access point for the out-of-range users.C
Upgrade the out-of-range users’ SSID searching software.D
Enable network sharing on the users’ computers that are within range.
考题
单选题Which of the following best describes why a customer would choose x86 server solutions over mid-range or mainframe solutions？（）A
x86 servers are more reliable than mid-range and Mainframe servers.B
x86 servers require less support personnel.C
Microsoft Operating Systems require less maintenance than mid-range and Mainframe Operating Systems.D
x86 solutions cost less.
考题
单选题Operating a rotary pump at speeds in excess of design requirements could cause（）.A
decreased clearances between rotating partsB
decreased slippage to the suction side of the pumpC
air binding in the discharge portsD
erosion and excessive wear
考题
单选题The operating speed of a turbocharger is directly dependent upon（）A
engine speedB
engine loadC
intake manifold pressureD
atmospheric pressure
考题
单选题Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）A
AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position，course，speed and other safety related information to all those with similar equipment in the areaB
AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position，course，speed and other safety related information to all those with similar equipment in the areaC
AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position，course，speed and other safety related information to all those with similar equipment in the areaD
AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position，course，speed and other safety related information to all those with similar equipment within the area
考题
单选题If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.A
misalignment or worn main bearingsB
insufficient cylinder lubricationC
defective or poorly fitted valvesD
all of the above
考题
单选题To prevent the build up of high stresses engine must not be run continuously （）.A
faster than dead slow speedB
slower than dead slow speedC
with the output of MCRD
at critical speeds
考题
单选题One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）A
flattening of the bowl neoprene O-ringsB
operation within the explosive rang of the fuelC
excessive purifier operating pressuresD
excessive oil viscosity
考题
单选题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 increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
单选题An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.A
manoeuvring operationsB
bad combustionC
coolingD
mooring trial
考题
单选题The purpose of the flywheel is to （）A
provide energy to operate the engine between power impulsesB
neutralize the primary inertia force of the crankshaftC
reduce the shock of starting loads on the main bearingsD
prevent the engine from operating at critical speed
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