Miscellaneous Questions (Set 1) | Multiple Choice Questions

1. When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated ___________.

clockwise, due to the bowl rotating clockwise

clockwise, due to the bowl rotating counterclockwise

counterclockwise, due to the bowl rotating clockwise

counterclockwise, due to the bowl rotating counterclockwise

2. Which of the listed contaminants will be satisfactorily removed from fuel oil by centrifuging?

Sludge

Diesel fuel

Lube oil

Gasoline

3. Which of the following conditions is most likely to occur if oil containing moisture is continuously fed to a purifier operating as a clarifier?

The purifier must be operated at a higher temperature.

The purifier must be operated at a higher speed.

The purifier will gradually change operation to separation.

The bowl will eventually fill with water.

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

remove the discharge ring

reprime the purifier

slow the centrifuge to its proper speed

install an additional discharge ring

5. A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?

Gasoline

Water

Lubricating oil

Sulphur compounds

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

oil has a tendency to emulsify in the bowl

purifier will act as a clarifier at the discharge ring

oil will be lost through the water discharge ports

oil solids will be deposited only at the intermediate top disk

7. Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?

The viscosity of the fuel.

The quantity of water to be removed from the fuel.

The specific gravity of the fuel.

The quantity of dirt to be removed from the fuel.

8. The output pressure of a diesel engine lube oil pump is regulated by a/an ______________.

relief valve

metering valve

variable speed pump drive

orifice in the lube oil header

9. The lube oil pump used in a diesel engine is a _____________.

volute pump

centrifugal pump

diaphragm pump

gear pump

10. How does water enter the crankcase of a diesel engine?

Through the crankcase exhauster.

As water vapor contained in blow-by.

Demulsifying lube oil passing through the main bearings.

Condensation from vapor formed in the expansion tank.