家在线测试 Test about Separators, ALCAP System v5.0

在线测试： Test about Separators, ALCAP System v5.0

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问题 1 从 19

Capacitance is defined as:

The capacity to hold charge.

Ratio of change in charge in a system to the change in its electric.

The capacity to conduct electricity in a fluid.

Cat Fines are:

Aluminium and Silicon catalytic fines which can cause abrasive wear.

Fine hair from cats which contaminate Fuel Oil.

Unknown particles whose role in fuel is not known.

Clarifiers needed modification to ALCAP design because:

Entrained water could enter from a number of sources.

New Technology was preferred.

The size of the machine could be reduced.

Essentially, an ALCAP Purifier is:

A totally different machine from Purifiers and Clarifiers.

A new product offering from Alfa Laval to diversify product range.

A Clarifier that removes water.

How is water removed from the ALCAP fuel oil separator bowl?

By ejecting it with solids at discharge or by opening the water drain valve.

The ALCAP separator is for removing catalytic fines only.

The ALCAP is a clarifier and a clarifier does not remove water.

Water is only removed when necessary, if there is no water in the fuel, there is no need to remove it.

How many gravity discs are fitted in the ALCAP separator?

None, but a flow control disc is fitted.

One, but there are many in a set.

Only one at a time.

It depends on the density of the fuel.

The size is determined from the table in the instruction manual.

Is the measured capacitance of oil higher or lower than that of water?

Capacitance of oil is lower than that of water.

Capacitance depends on the type of oil and water.

Water has a lower dielectric constant.

The dielectric constant of water is 4.

One of the main reasons for the ALCAP purifier was:

Results showed purifiers performed better than clarifiers.

The New technology had to be used as a lot of investment was made.

A Clarifier gave better performacne than a well adjusted purifier.

The EPC 400 controller is a sophisticated piece of microelectronics. Which of the following statements best describes components and functions to be controlled?

Fail safe actions of valve actuation and motor stop facility.

Control of opening and closing water and the positioning of the interface for optimum separation.

Temperature control and correct positioning of the interface.

To monitor the transducer value and to take action if the level gets too high.

To keep a good check on the separator so the operator can sit in the control room and smoke.

The Flow control valve:

Allows a reduced flow of water from the water outlet when the drain valve is opened.

Allows unrestricted flow of water.

Has no role in control of water flow.

The Function of the EPC 400 is:

To receive input parameter signals and take controlling action.

To increase the complexity of the installation.

To provide automatic backup for manual operation.

The transducer function is:

To measure the current flow in the oil.

To amplify flow signal.

To sense the water content in the oil by difference in dielectric capacity.

What are the letters ALCAP understood to stand for?

Alfa Laval Clarifier and Purifier.

Alfa Laval’s Clarifiers Are Perfect.

All Capacity Separator.

What were the key issues which led to the development of the ALCAP separator?

The oil crisis of 1973 and 1978, along with the increasing demand for distillates.

Laboratory tests and oil price increases.

The stepping up of the refining process and the interface instability.

The need to use only one separator and more carbon in the residue.

Too many catalytic fines and the need for cheaper fuel.

Which of the following are the most important for optimum cleaning efficiency in a centrifugal separator?

The oil water interface to be positioned outside the disc stack but inside the top disc.

Fuel with a low density and viscosity.

Stopping all the water leaks into the fuel system.

Using a purifier and a clarifier in series.

Making sure that the purifier does not loose its water seal.

Which of the following statements is most accurate?

Particle separation is best in an ALCAP separator because the interface is always outside the outer edge of the top disc.

The purifier which was commissioned by the Alfa laval engineer 2 months ago gives best particle separation.

The series operation of purifier and clarifier gives best particle removal.

The clarifier will always be better at removing particles from heavy fuel oil.

Which of the following statements is most favourable with regard to achieving the cleanest possible oil?

An ALCAP separator with accurate temperature control.

A single purifier where the temperature is fluctuating by 10 °C.

A clarifier used for lubricating oil cleaning where analysis of the oil has revealed some water in the oil.

A purifier and clarifier in series where there is never a seal alarm.

A purifier where the gravity disc was checked by the Alfa Laval representative 2 weeks ago.

Why can the interface position be such a problem in the purifier bowl?

It is very easily affected by changes in density, viscosity temperature and flow.

It can be in the wrong size gravity disc.

To get a good night sleep the engineer should ensure the interface is well into the disc stack.

It is easy to get the interface in the wrong position in a clarifier.

If the interface is in the disc stack the separation result will be bad.

Why was a Clarifier type design preferred over Purifier in designing ALCAP?

Clarifiers were easier to manufacture.

Clarifiers were seen to be better at particle removal.

It was the decision of Alfa Laval Engineers.

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