轮机英语三管轮试题 分油机

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_____.