__________ treatment is done for appreciable improvement in viscosity index of lubricating oil.

Viscosity index of a lubricating oil

A

Is the measure of its flash point

B

Is the measure of variation of viscosity with temperature

C

Should be low

D

None of these

Medium viscosity lubricating oil can be most ideally pumped by a __________ pump.

A

Vane

B

Piston

C

Centrifugal

D

Plunger

Higher viscosity of lubricating oil usually signifies

A

Lower Reid vapour pressure

B

Higher acid number

C

Higher flash point and fire point

D

Lower flash point and fire point

After the increase of price of oil by 40%, a family decided to reduce its oil consumption so that the expenditure for oil goes up by 26% only. If the total consumption of oil before the price rise was 10 kg per month, then what is the current consumption of oil per month (in kg)?

A

8

B

8.50

C

9

D

None of these

Higher vicosity index of a lubricating oil denotes

A

Less changes in fluidity of oil with temperature

B

Substantially high change in fluidity of oil with temperature

C

Its unsuitability under varying temperature conditions

D

None of these

A multigrade lubricating oil means an oil having high

A

Viscosity index

B

Viscosity

C

Aniline point

D

Flash point

__________ is not an important refinery process for upgrading the quality of lubricating oil.

A

Deoiling

B

Solvent refinning

C

Clay treatment

D

Hydrotreatment

The import of crude oil and petroleum done from national oil companies of producer countries, which have a net exportable surplus of oil is by

A

term contracts

B

term tenders

C

monthly tenders

D

All the above

With increase in temperature, the thermal conductivity of fresh lubricating oil

A

Increases

B

Decreases

C

Remains unchanged

D

May increase or decrease; depends on its composition

Paraffins are desirable in lubricating oil, as it has got high

A

Viscosity

B

Viscosity index

C

Smoke point

D

Pour point

__________ treatment is done for appreciable improvement in viscosity index of lubricating oil.

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