A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge（）

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• A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）

  A . Gasoline B . Water C . Lubricating oil D . sulphur compound

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• Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）

  A . Correct the cause of the scoring and repair the sleeve or replace with a new one B . Reassemble the unit and provide more water leak off for proper lubrication C . Check for parallel alignment of the sleeve radial faces to the sleeve bores D . Reassemble the unit and adjust the governor to obtain a slower speed

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• The usual symptoms of cavitation in a centrifugal pump is （）.

  A . noise and vibration B . an increase in discharge pressure C . an increase in suction pressure D . lifting of the relief valve

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• Which of the following pumps belongs to centrifugal pump?（）

  A . Reciprocating pump B . Screw pump C . Diffuser pump D . Water-ring pum

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• Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

  A . Impurities B . Lube oil C . Gasoline D . Diesel fuel

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• Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screw

  A . （1）and（2） B . （1），（2）and（3） C . （1）and（3） D . （2）and（3）

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• If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

  A . packing gland B . mechanical seals C . lantern rings D . wearing ring

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• Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build up

  A . （1），（2） B . （2），（3） C . （1），（2），（3） D . （2）only

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• Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）

  A . Close radial clearance between impeller hub and casing B . Low rotational speed of impeller C . Removable end plate D . Replaceable impeller and casing wearing ring

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• Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) rotary (3) centrifugal

  A . (1)only B . (1)and (2) C . (1),(2)and(3) D . (2)and(3)

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• Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

  A . The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow B . The pump packing gland overheats after short operating periods C . The motor over-current protective device continually shuts the pump down D . Pounding noises can be heard at the pump suction chest

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• Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）

  A . Oil is discharged from the impeller through the outlet B . Gravity causes the oil to flow toward the discharge C . The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts D . The discharge capacity varies directly with the speed of the impeller

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• Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）

  A . Impeller B . Electric motor C . Volute D . Eye

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• A centrifugal impeller consists of a number of vanes curving （） from the direction of rotation.

  A . backwards B . forwards C . upward D . downward

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• Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals（）

  A . an injection process B . an ejection process C . a separation process D . a heating proce

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• Which of the listed statements is correct concerning the starting of centrifugal pumps?（）

  A . They should always be started with the discharge valve closed B . They should always be started with the discharge valve opened C . A priming pump is always required to flood the impeller suction D . They should always be started with the sealing line valves closed

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• Which of the following statements is true concerning centrifugal pumps?（）

  A . They are particularly suited for pumping high viscosity fluids B . They are started with the discharge valve opened C . The flow of liquid is developed by imparting energy due to the rotation of an impeller D . They are always mounted in a horizontal positio

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• Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal

  A . (1)only B . (1)and(2) C . (1),(2)and(3) D . (2)and(3)

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• “A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）

  A . a centrifuge B . an electric motor C . a bowl assembly D . a driving motor

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• Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）

  A . Sludge B . Gasoline C . Fuel oil D . Lube oil

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• 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 result B、The lube oil will not be subjected to the proper centrifugal force C、The lube oil will overheat and flash D、Oil will discharge from the heavy phase discharge port and be wasted.

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• Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals.

  A.an injection process B.an ejection process C.a separation process D.a heating process

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• Which of the following statements is true concerning centrifugal pumps？

  A.They are particularly suited for pumping high viscosity fluids B.They are started with the discharge valve opened C.The flow of liquid is developed by imparting energy due to the rotation of an impeller D.They are always mounted in a horizontal position

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