Lubricants Chemistry MCQs

By Prof. Fazal Rehman Shamil
Last modified on April 27th, 2021

Lubricants Chemistry MCQs

Which of the following is the lowest temperature at which the soils gives enough vapour?

(A).  Flash point

(B).  Cloud point

(C).  Pour point

(D).  Fire point

(E). None of these

Multiple Choice Question Answer:  Flash point

 

The formed vapour is ______ when the lubricating oil is volatilised.

(A).  Non-inflammable

(B).  Must be high

(C).  Must be less

(D).  Flammable

(E). None of these

Multiple Choice Question Answer:   Non-inflammable

To find out the _____ Pensky Marten’s apparatus is used.

(A).  Cloud point

(B).  Pour point

(C).  Fire point

(D).  Flash point

(E). None of these

Multiple Choice Question Answer:  Flash point

The oil cup is made up of_____in Pensky marten’s apparatus.

(A).  Copper

(B).  Iron

(C).  Brass

(D).  Steel

(E). None of these

Multiple Choice Question Answer:   Brass

By using _____ location of the cup in air bath can known.

(A).  Shutter

(B).  Leaver

(C).  Flange

(D).  Pilot burner

(E). None of these

Multiple Choice Question Answer:  Flange

F

By_____ flame exposure device is connected.

(A).  Flange

(B).  Oil cup

(C).  Pilot burner

(D).  Shutter

(E). None of these

Multiple Choice Question Answer:  Shutter

_____must be present in transformer oils.

(A).  Good dielectric strength

(B).  More viscosity

(C).  More oiliness

(D).  Low dielectric strength

(E). None of these

Multiple Choice Question Answer:   Good dielectric strength

The oils with the high cloud point, low pour point and low viscosity are used in the refrigerator system.

(A).  False

(B).  True

(E). None of these

Multiple Choice Question Answer:   False

_____ for the lightest grade is the maximum pour point which is a requirement for a refrigerator system.

(A).  -10oF

(B).  -40oF

(C).  -30oF

(D).  -20oF

(E). None of these

Multiple Choice Question Answer:   -40oF

There are____ the mechanisms for lubrication.

(A).  3

(B).  2

(C).  1

(D).  4

(E). None of these

Multiple Choice Question Answer:   3

Due to ____ property, liquid lubricants stick.

(A).  Surface tension

(B).  Mass of the liquid

(C).  Temperature coefficient

(D).  Viscosity

(E). None of these

Multiple Choice Question Answer:   Viscosity

_____ is the range of coefficient of friction of the unlubricated surface.

(A).  0.1-1.0

(B).  0.1-0.5

(C).  0.1-1.5

(D).  1.5-2.0

(E). None of these

Multiple Choice Question Answer:   0.1-1.5

Hydrodynamic lubrication’s effectiveness is not depending upon _____

(A).  Design of bearing

(B).  Area of shaft

(C).  Rate of rotation of the shaft

(D).  Load

(E). None of these

Multiple Choice Question Answer:   Area of shaft

Such as high load in boundary lubrication, the continuous fluid film cannot be maintained between the rubbing surfaces.

(A).  False

(B).  True

(C). Partially True

Multiple Choice Question Answer:   True

The coefficient of friction in boundry lubrication ranges _____

(A).  0.05-0.1

(B).  0.5-0.15

(C).  1-1.5

(D).  0.05-0.15

(E). None of these

Multiple Choice Question Answer:   0.05-0.15

____ are formed in thin lubrication and wear and tear of metal surfaces are involved.

(A).  P-n junctions

(B).  Thin layers

(C).  Layers

(D).  Welded junctions

(E). None of these

Multiple Choice Question Answer:  Welded junctions

In _____ lubrication generation of heat takes place.

(A).  Thin lubrication

(B).  Thick lubrication

(C).  Boundary lubrication

(D).  Extreme pressure lubrication

(E). None of these

Multiple Choice Question Answer:  Extreme pressure lubrication

There is the possibility that the liquid lubricant can be_____

(A).  Boiled

(B).  Heated

(C).  Sublimated

(D).  Evaporated

(E). None of these

Multiple Choice Question Answer:   Evaporated

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