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单选题
When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）
A
maintain alignment when the ship’s hull is working in heavy seas
B
ensure engine vibrations correspond to the natural frequency of the hull
C
permit the engine to expand away from the driven equipment as the engine heats up and expands
D
maintain engine thrust bearing clearances
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更多 “单选题When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）A maintain alignment when the ship’s hull is working in heavy seasB ensure engine vibrations correspond to the natural frequency of the hullC permit the engine to expand away from the driven equipment as the engine heats up and expandsD maintain engine thrust bearing clearances” 相关考题
考题
Since RAM is only active when the computer is on, your computer uses disk to store information even when the computer is off. Which of the following is true?(74).A．When your computer is on, only RAM is used to store information.B．When your computer is on, only disk drives are used to store information.C．When your computer is off, only RAM is used to store information.D．When your computer is off, only disk drives are used to store information.
考题
When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for workA.remains the sameB.is reducedC.is increasedD.is eliminated
考题
A controllable pitch propeller on a diesel driven vessel eliminates the need forA.friction clutchesB.disconnect clutchesC.reversing gearsD.reduction gears
考题
A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles ofA.waterB.babbittC.iron or steelD.acids
考题
In reducing engine speed to an efficient propeller speed by the use of reduction gears, _______.A.speed and torque are both reducedB.speed is reduced and torque remains unchangedC.speed is reduced and torque is increasedD.speed is sometimes unchanged while torque is increased
考题
Which two patented or patent－pending compression and caching technologies are used for WX／WXC devices?()(Choose two.)
A. Network Sequence Caching (NSC)B. Molecular Sequence Caching (MSC)C. Network Sequence Reduction (NSR)D. Molecular Sequence Reduction (MSR)
考题
Rewrite rules are used in which CoS scenario?()
A.When a single device is configured to provide differentiated services.B.When multiple devices in a network are configured to use CoS to provide differentiated services.C.When a device is used to connect to another autonomous system.D.When CoS is used to classifiy traffic as low priority.
考题
● Since RAM is only active when the computer is on, your computer uses disto store information even when the computer is off. Which of the following itrue? （74）（74）A．When your computer is on, only RAM is used to store informationB．When your computer is on, only disk drives are used to storinformation.C．When your computer is off, only RAM is used to store informationD．When your computer is off, only disk drives are used to storinformation.
考题
Which of the following explains the relationship between a physical and logical partition？（）A、A physical partition is hosted on one or more logical partitions. A logical partition is used when describing storage.B、A logical partition is hosted on one or more physical partitions. A physical partition is used when describing storage.C、A physical partition is used when describing only a SCSI or SAS disk. A logical partition is used when describing a SAN LUN.D、A logical partition is used when describing only a SATA or SAS disk. A physical partition is used when describing RAID or mirrored arrays.
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Which three types of optimization does the WX 60 device perform when Exchange 2000 and Outlook 2000 are used in the network? （）(Choose three.)A、Fast Connection SetupB、TCP Acceleration (AFP)C、Network Sequence CachingD、AppFlow's MAPI accelerationE、Molecular Sequence Reduction
考题
单选题One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.A
the extra weight required for the diesel reduction gearingB
a minimum speed for the engines that limits the minimum speed of the vesselC
the higher fuel consumption per SHPD
the low efficiency of the system when a controllable pitch propeller is used
考题
单选题To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should （）A
ground the boardB
avoid reversing the polarity of the leadsC
isolate sensitive components with heat sinksD
all of the above
考题
单选题When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）A
remains the sameB
is reducedC
is increasedD
is eliminated
考题
单选题A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.A
waterB
babbittC
iron or steelD
acids
考题
多选题Which two patented or patent-pending compression and caching technologies are used for WX/WXC devices?（）(Choose two.)ANetwork Sequence Caching (NSC)BMolecular Sequence Caching (MSC)CNetwork Sequence Reduction (NSR)DMolecular Sequence Reduction (MSR)
考题
多选题Which three types of optimization does the WX 60 device perform when Exchange 2000 and Outlook 2000 are used in the network? （）(Choose three.)AFast Connection SetupBTCP Acceleration (AFP)CNetwork Sequence CachingDAppFlow's MAPI accelerationEMolecular Sequence Reduction
考题
单选题The required fireman’s outfits required for ship’s are not to be used for any other purpose EXCEPT for the（）.A
oxygen and explosion meter when it is used for detection of flare gasesB
self-contained breathing apparatus，when used as protection from gas leaking from a refrigeration unitC
boots and gloves that are made of rubber or electrically non-conductive material，if used when repairing electrical equipmentD
lifeline，if used by personnel entering a compartment which might be deficient of oxygen
考题
单选题When using the term limber system one is referring to a（）.A
Cleaning systemB
Drainage systemC
Strengthening systemD
Weight reduction system
考题
单选题During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）A
Flywheel inertiaB
Admission of starting airC
The way of the vesselD
securing of fuel to the cylinders
考题
单选题A fid is a（）.A
mallet used when splicing wire ropeB
sharp pointed crow bar used to unlay wire ropeC
tapered steel pin used to separate wire ropeD
tapered wooden pin used when splicing heavy rope
考题
单选题Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）A
corrosion on the gearsB
excessive gear speedC
dirt in the oilD
misalignment of the gears
考题
单选题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 sumpB
is connected to the propeller shaftC
is driven at the highest RPMD
compensates for alignment variations between the engine and pinion gear
考题
单选题In using reduction gears to obtain efficient propeller speeds, （）.A
they must be located at the after end of the engineB
they can only be used with one engine at a timeC
they eliminate the need for controllable pitch propellersD
they are connected to the engine with a flexible coupling
考题
单选题Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）A
hard startingB
excessive fuel consumptionC
loss of powerD
all of the above
考题
单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）A
ElectricB
HydraulicC
AirD
All of the above
考题
单选题Which of the following explains the relationship between a physical and logical partition？（）A
A physical partition is hosted on one or more logical partitions. A logical partition is used when describing storage.B
A logical partition is hosted on one or more physical partitions. A physical partition is used when describing storage.C
A physical partition is used when describing only a SCSI or SAS disk. A logical partition is used when describing a SAN LUN.D
A logical partition is used when describing only a SATA or SAS disk. A physical partition is used when describing RAID or mirrored arrays.
考题
单选题With（） the engine need not to be aligned with reduction gears or propeller shaft.A
Diesel engine propulsionB
Diesel electric propulsionC
Steam engine propulsionD
Gas turbine propulsion
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