轮机英语三管轮试题--分油机.doc

轮机英语
Lesson 17
1682. Emulsification of oil will occur when mixed with
A. air B. black oil C. water D. ice cream
1683. A centrifuge arranged to separate two liquids is known as_____.
A. an oily water separator B. a purifier C. a centrifugal compressor D. a clarifier
1684. A centrifuge arranged to separate impurities and small amounts of water from oil is known as_____.
A. an oily water separator B. a purifier
C. a centrifugal compressor D. a clarifier
1685. When a clarifier is running the impurities and water collect at the bowl_____.
A. center B. periphery C. inlet D. upper parts
1686. For many years marine centrifuges were designed for_____ operation, that is the machines were run for a period during which solids accumulated in the bowl. The machine was stopped when the accumulated solids began to impair its performance.
A. purifying B. batch C long period D. temporary
1687. For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the_____.
A. bowl periphery B. bowl center C. upper surface D. lower surface
1688. For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the_____.
A. bowl periphery B. bowl center C. upper surface D. lower surface
1689. The_____ of the gravity disc is too big. It cause oil to flow through the water outlet. We changed the disc and no oil is found in the water outlet.
A. gravity B. diameter C. circumference D. cylinder
1690. Dirty oil must be_____ before being used again .
A. mixed with clean oil B. purified C. heated D. strained
1691. Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?
A. Height of the machine B. Temperature of the liquid seal
C. Gravity disc D. Bowl diameter
1692. For a L.O. purifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will_____.
A. be interrupted B. move downwards
C. move outwards D. retain original position
1693. When in operation, it is unavoidable that a small amount of oil_____ through leakage, and in order to compensate for these leaks the system is connected to a feed pump.
A. escapes B. overheats C. expands D. accelerates
1694. Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and_____ in size.
A. expand B. extract C. increase D. decrease
1695. When a centrifuge is arranged to separate impurities and small amount of water from oil, it is known as a_____.
A. purifier B. separator C. filter D. clarifier
1696. _____ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.
A. A filter B. A centrifuge C. A distiller D. A generator
1697. In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to_____.
A. the outlet of oil B. the outlet of water
C. the bowl periphery D. the center of bowl
1698. ____ is the breakdown of surface tension between oil droplets in an oil water mixture which causes them to join and increase in size.
A. Wear B. Contaminating C. Coalescence D. Coarse separating
1699. The position of the interface between oil and water within the centrifuge is achieved by the use of_____.
A. gravity disc B. centrifugal bowl C. a stack of discs D. main sealing ring
1700. To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting_____.
A. flashing water B. operating oil C. flushing water D. sealing water
1701. The interface between the liquid seal (water) and the oil should be positioned_____ possible to the bowl periphery.
A. as far as B. as soon as C. as close as D. as closer as
1702. What is used to purify water and foreign matters from the fuel oil in the following?
A. Compressor B. Separator C. Evaporator D. Fuel pump
1703. They understand the_____ of automatic sludge discharging of the purifier. But they are not good in practice.
A. principle B. principal C. theory D. case
1704. The diameter of the gravity disc is too big. It causes oil to flow through the water outlet. We changed the disc and no_____ is found in the water outlet.
A. water B. oil C. scale D. ridge
1705. If oil density were greater than water' s, the oil separator_____.
A. did work B. would work well
C. didn't work D. wouldn't work
1706. Sediment collects in a tubular purifier_____.
A. on top cover B. on sides of bowl
C. in drain line on the discs D. on the discs
1707.. Both fuel oils and lubricating oils require _____________before passing to the engine.
A. treatment B. heating C. cooling D. boiling
1708. The treatment of the fuel oils involves storage, heating, filtering and ____________.
A. centrifuging B. pressurizing C. atomization D. igniting
1709. ____________is used to separate two liquids or a liquid and solids as in contaminated oil.
A. Oily-water separator B. Purifier
C. Clarifier D. Centrifuge
1710. Where a centrifuge is arranged to separate two liquids, it is known as a ___________.
A. purifier B. clarifier
C. liquid-separator D. oily-water separator
1711. Where a centrifuge is arranged to separate impurities and small amounts of water from oil it is known as a ____________.
A. A. Oily-water separator B. Purifier C. Clarifier D. Centrifuge
1712. “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
1713. A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge ____________.
A. by opening the separator manually
B. by separating the lower part from the upper part automatically
C. by separating the upper part from the lower part automatically D. continuously
1714. Before the in a purifier is ejected, ______________.
A. the oil feeding is stopped and replaced by admitting flushing water.
B. the flushing water feeding is stopped and replaced by admitting oil.
C the feeding of dirty oil and flushing water is stopped.
D. the feeding of dirty oil and flushing water is admitted.
1715. Main engines as well as auxiliary engines operating on heave fuel should have continuous ______ on the lubricating oil, either according to the bypass or batch principles.
A. filtering B. centrifuging C. depositing D. operating
1716. Modern centrifuge designs enable continuous over a considerable period of
time. This 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
1717. When two oil separators are working in series, they should work with ___
A. both as clarifiers B. first one as clarifier, second one as purifier
C. both as purifiers D. first one as purifier, second one as clarifier
1718. One of the reasons that cause oil flowed from sludge outlet of a self –cleaning separator is ___.
A. seal water supply be cut off
B. make up water supply be cut off
C. oil outlet valve closed or not open sufficiently
D. the flow rate of oily water is too much
1719. When separating lube oil in oil separator, the optimal separating quantity is
__of the rated quantity on name plate
A. 100% B. 1/2 C. 1/5 D. 1/3
1720. When separating fuel oil in oil separator, the separating quantity is ___of the rated quantity
A. 100% B. 80% C. 1/2 D. 1/3
1721. The separating effect of oil separator is not good, the reason may be __
A. too little seal water
B. improper gravity disc
C. oil discharging pump not working very well
D. low water level of the working water
1722. When separating the lube oil without additive, it is usually cleaned with hot
water .the aim is to remove __from it
A. acid B. sludge C. mechanical impurity D. salinity
1723. When finish working on the oil separator, you should ___firstly
A. cut off the power B. cut off the oil inlet
C. open guide water valve D. close oil outlet valve
1724. To ensure oil separator working in normal condition, the interval between two
sludge dischargings should not exceed ____
A. 2h B. 4h C. 5h D. 6h
1725. _______can cause oil flow from water outlet of a separator
A. oil inlet valve opening too quickly B. oil temperature too high
C. diameter of gravity disc too small D. viscosity of oil too low
1726. ____ can not cause oil flow from water outlet of self cleaning separator
A. oil temperature too high B. diameter of gravity disc too large
C. oil temperature too low D. high level tank out of water
1727. ____can cause oil flow from sludge outlet of self cleaning separator
A. too much sludge accumulated in separator bowl B. diameter of gravity disc too large
C. high level tank lack of water D. oil input too rapidly
1728. ________ are required to remove small quantities of water from a much larger amount of oil. Additionally it must separate solids.
A. Incinerators B. Centrifuges
C. Oily water separators D. Incinerator
1729. On board supply vessels, a centrifuge is normally used to purify ___________.
A. cooling water B. fuel oil C. sea water D. diesel intake air
1730. For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable _________.
A. throughput B. additive percent C. cetane number D. TBN number
1731. Heavy residual fuel oils are heated prior to centrifuging to __________.
A. reduce fuel weight B.increase specific gravity
C.separate fuel from lube oil D.reduce fuel viscosity
1732. In a disk-type lubricating oil purifier, ___________________.
A. the purifier driving gears are lubricated by the reclaimed.
B. oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling water.
C. sealing water must never be supplied until after oil is fed to the unit.
D. deterioration of the bowl ring gasket will cause the purifier to lose its water seal.
1733. 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 purifier
B. viscosity of the oil being purified
C. maximum design speed of that purifier
D. specific gravity of the oil being purified
1734. One engine manufacturer recommends heavy fuel oil should not be heated above 80oC to 95oC (176oF to 203oF) before purification. This upper limit should be observed to ensure against _______________.
A. flattening of the bowl neoprene O-rings B. operation within the explosive range of the fuel
C. excessive purifier operating pressures D. excessive oil viscosity