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: Â 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: Â Â 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: Â 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: Â Â 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: Â 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: Â 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: Â Â 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: Â Â 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: Â Â -40oF
There are____ the mechanisms for lubrication.
(A). 3
(B). 2
(C). 1
(D). 4
(E). None of these
Multiple Choice Question Answer: Â Â 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: Â Â 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: Â Â 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: Â Â 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: Â Â True
The coefficient of friction in boundry lubrication ranges _____
(A). 0.05-0.1
(B). 0.5-0.15
(C). 1-1.5
(D). Â 0.05-0.15
(E). None of these
Multiple Choice Question Answer: Â Â 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: Â 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: Â 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: Â Â Evaporated
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