Purifiers Quiz

Question 1

The water seal in a centrifuge, operating at normal speed, prevents the lube oil from discharging from the water outlet. Another function of the seal is to __________ .

Answer 1

provide an area for separated water to pass and create a path to remove the water from the bowl

Question 2

Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures?
A	Diesel fuel oil
B	Metal particles
C	Water
D	Carbon particles

Answer 2

A Diesel fuel oil

Question 3

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
A	Sludge
B	Gasoline
C	Fuel oil
D	Lube oil

Answer 3

A Sludge

Question 4

Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a __________.

Answer 4

high temperature and a low viscosity

Question 5

For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable __________.

Answer 5

throughput

Question 6

Which factor determines the size of the ring dam for a fuel oil centrifugal purifier?

Answer 6

Specific gravity of the fuel.

Question 7

In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should __________ .

Answer 7

be maintained in a temperature range of 160F to a maximum of 180F

Question 8

Which of the following statements concerning the operation of a lube oil purifier is correct?
A They should be operated at maximum design speed and recommended operating capacity.
B They should be operated as slowly as possible to ensure a long service life.
C They should not be primed with water when operated as a separator.
D They should be operated as clarifiers for optimum moisture removal.

Answer 8

A They should be operated at maximum design speed and recommended operating capacity.

Question 9

Various tests while conducting a fuel oil analysis can be performed on board to facilitate proper centrifugation. What test provides the key data for selecting the correct purifier gravity disk for fuel oil centrifugal purifiers?

Answer 9

Density

Question 10

If fuel oil were being discharged from the waste water outlet of a fuel oil disk type centrifuge, operated as a separator, you should __________.

Answer 10

re-prime the purifier with sealing water

Question 11

A modern centrifuge, similar to the device shown in the illustration, is opened for periodic cleaning. The most common cause of operating failure after reassembling, is due to __________. MO-0012

Answer 11

not replacing the bowl o-rings that have taken a permanent set

Question 12

The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be __________. Illustration MO-0012

Answer 12

203F to less than 212F

Question 13

The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl, with straight, vertical, interior surfaces, is that the illustrated unit __________. Illustration MO-0012

Answer 13

is self-desludging

Question 14

If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the __________.

Answer 14

oil will be lost through the water discharge ports

Question 15

As Chief Engineer of a slow speed diesel engine vessel equipped with an ALCAP fuel oil purification system. You note a definite increase in the rate at which the purifier sludge tank is rising. One of the first items to check on your system would be which of the following?
A The opening water solenoid for leak through.
B The water transducer located in the dirty oil supply line.
C The RPM of the bowl.
D The voltage to the EPC control cabinet.

Answer 15

A The opening water solenoid for leak through.

Question 16

Lube oil is preheated before centrifuging in order to __________.

Answer 16

improve purification

Question 17

Water is best removed from lubricating oil by __________.

Answer 17

centrifuging

Question 18

The bulk of the solid material entering a centrifugal purifier with lube oil is __________.

Answer 18

trapped in the bowl

Question 19

The dirty oil inlet on centrifugal lube oil purifiers is located at the __________.

Answer 19

bottom of the tubular bowl type

Question 20

In a disk type centrifugal purifier, the bowl is mounted on the upper end of the __________.

Answer 20

bowl spindle

Question 21

During the routine inspection of an operating centrifugal lube oil purifier, you notice oil discharging through the water discharge port. Which of the following actions should be taken?
A Add water to seal the bowl.
B Decrease the temperature of the entering oil to lower the specific gravity.
C Increase the bowl speed to balance the water and oil discharges.
D Do nothing as this is normal.

Answer 21

A Add water to seal the bowl.

Question 22

In a disk type lubricating oil centrifuge (deterioration of the bowl ring gasket…) __________.

Answer 22

deterioration of the bowl ring gasket will cause the purifier to lose its water seal

Question 23

In order to maintain the effectiveness of the lube oil centrifuge to remove water, the engineer in charge should __________.

Answer 23

take lube oil samples each week and place in clear containers for inspection

Question 24

When water is removed from lube oil passing through a centrifugal purifier, the water removed will __________.

Answer 24

displace an equal amount of water from the bowl seal

Question 25

One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________.

Answer 25

minimize agitation of the oil-water mixture