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单选题
If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the（）
A
oil has a tendency to emulsify in the bowl
B
purifier will act as a clarifier at the discharge ring
C
oil will be lost through the water discharge ports
D
oil solids will be deposited only at the intermediate top disk
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Which of the following is NOT true about the centrifugal separator?
A.It can be applied to separate two liquidsB.It cannot separate solids which contaminated in the oil.C.It consists of purifier and clarifierD.The centrifuge arranged to separate two liquids is known as purifier
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Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?A.The viscosity of the fuel.B.The quantity of water to be removed from the fuel.C.The specific gravity of the fuel.D.The quantity of dirt to be removed from the fuel.
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If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, theA.oil has a tendency to emulsify in the bowlB.purifier will act as a clarifier at the discharge ringC.oil will be lost through the water discharge portsD.oil solids will be deposited only at the intermediate top disk
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For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _______.A.bowl peripheryB.bowl centerC.upper surfaceD.lower surface
考题
DOS是()的缩写。
A.Disk operation SystemB.Disk SystemC.Dine Ctoryoperation SystemD.Diskette Operate System
考题
High-speed rotation in a centrifugal purifier can produce a force ______the force of gravity.A.many thousand times larger thanB.the same asC.many thousand times smaller thanD.which has nothing to do with
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When considering SAN to SAN replication between sites， which of the following is the MOST important concern？（）A、 WAN link speedB、 Block sizeC、 Disk sizeD、 File system type
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Which command is used to configure RMAN to perform a compressed backup for every backup executed？（）A、 BACKUP AS COMPRESSED BACKUPSET DATABASEB、 BACKUP AS COMPRESSED COPY OF DATABASEC、 CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSETD、 CONFIGURE DEVICE TYPE DISK BACKUP TYPE COMPRESS E、 BACKUP DATABASE COMPRESS
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You configured the default backup device type as disk for RMAN backups. In your database，because of business requirements，you have to take a simultaneous duplicate backup of the data files when the RMAN BACKUP command is used. What must you set using the RMAN CONFIGURE command to achieve this？（） A、 MAXSETSIZE TO 2B、 DEVICE TYPE DISK PARALLELISM 2C、 RETENTION POLICY TO REDUNDANCY 2D、 DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2
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In which situations will the ASM metadata backup help you recover the ASM disk in a disk group？（）A、 when one or more file directory paths are accidentally deleted from an ASM disk groupB、 when one of the disks in a disk group is accidentaly unpluggedC、 when the data file on an ASM disk group gets corruptedD、 when one or more disks in an ASM disk group are lost
考题
DOS是（）的缩写。A、Disk operation SystemB、Disk SystemC、Dine Ctoryoperation SystemD、Diskette Operate System
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单选题You configured the default backup device type as disk for RMAN backups. In your database，because of business requirements，you have to take a simultaneous duplicate backup of the data files when the RMAN BACKUP command is used. What must you set using the RMAN CONFIGURE command to achieve this？（）A
MAXSETSIZE TO 2B
DEVICE TYPE DISK PARALLELISM 2C
RETENTION POLICY TO REDUNDANCY 2D
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考题
单选题The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）A
rated capacity of that purifierB
viscosity of the oil being purifiedC
maximum design speed of that purifierD
specific gravity of the oil being purified
考题
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0， because channels have not been defined.B
3， as indicated by the degree of parallelism.C
1， the default value when device is configured.D
5， as indicated by the last parallelism command.
考题
单选题In a disk-type lubricating oil purifier, （）A
the purifier driving gears are lubricated by the reclaimedB
oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling waterC
sealing water must never be supplied until after oil is fed to the unitD
deterioration of the bowl ring gasket will cause the purifier to lose its water seal
考题
单选题Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）A
The viscosity off the fuelB
The quantity of water to be removed from the fuelC
The specific gravity of the fuelD
The quantity of dirt to be removed from the fuel
考题
单选题Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?（）A
Hydraulic oil pressureB
Servomotor actionC
Flyweight centrifugal forceD
Relay motion
考题
单选题When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.A
clockwise, due to the bowl rotating clockwiseB
clockwise, due to the bowl rotating counterclockwiseC
counterclockwise, due to the bowl rotating clockwiseD
counterclockwise, due to the bowl rotating counterclockwise
考题
单选题A centrifugal fuel oil purifier should be shut down if （）A
more sealing water is neededB
the cover clamp needs tighteningC
the purifier has a bad vibration when startedD
water is discharged from the overflow line
考题
单选题High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.A
many thousand times larger thanB
the same asC
many thousand times smallerD
none of the above
考题
单选题Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）A
Contamination of the lube oil by emulsification will resultB
The lube oil will not be subjected to the proper centrifugal forceC
The lube oil will overheat and flashD
Oil will discharge from the heavy phase discharge port and be wasted
考题
单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）A
Carbon particlesB
Lube oilC
GasolineD
Diesel fuel
考题
单选题One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.A
motor overload will openB
relief valve will openC
pump will overheatD
motor will overheat
考题
单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）A
ImpuritiesB
Lube oilC
GasolineD
Diesel fuel
考题
单选题If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.A
open；short；afterB
closed；short；afterC
open；long；beforeD
closed；long；before
考题
单选题When considering SAN to SAN replication between sites， which of the following is the MOST important concern？（）A
WAN link speedB
Block sizeC
Disk sizeD
File system type
考题
单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A
many thousand timesB
between timesC
one timeD
at times
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