250+ TOP MCQs on Properties of Lubrication – 1 and Answers

IC Engines Multiple Choice Questions on “Properties Of Lubrication – 1”.

1. Which of the following are the properties of lubricants?
a) viscosity
b) flash point
c) fire point
d) all of the mentioned
Answer: b
Clarification: The properties of lubricants are
i) viscosity
ii) flash point
iii) fire point
iv) cloud point
v) pour point
vi) corrosion
vii) physical stability
viii) neutralisation number
ix) film strength
x) oiliness
xi) emulsification
xii) chemical stability
xiii) adhesiveness
xiv) specific gravity.

2. ____________ is the ability of the oil to resist internal deformation due to mechanical stresses.
a) Viscosity
b) Flash point
c) Fire point
d) None of the mentioned
Answer: a
Clarification: Viscosity is the ability of the oil to resist internal deformation due to mechanical stresses and hence it is a measure of the ability of the oil film to carry a load.

3. A more viscous oil can carry a greater load, but it will offer great friction to sliding movement of the one bearing surface over the other.
a) True
b) False
Answer: a
Clarification: None.

4. Viscosity varies with the temperature and hence if a surface to be lubricated is normally at high temperature it should be supplied with oil of higher viscosity.
a) True
b) False
Answer: a
Clarification: None.

5. The viscosity is measured by ____________
a) barometer
b) thermometer
c) viscosimeter
d) none of the mentioned
Answer: c
Clarification: The viscosity is measured by viscosimeter.

6. A high viscosity index indicates relatively ____________ changes in viscosity of the oil with the temperature.
a) larger
b) smaller
c) constant
d) none of the mentioned
Answer: b
Clarification: None.

7. Pour point is the lowest temperature at which the lubricating oil will flash when a small flame is passed across its surface.
a) True
b) False
Answer: b
Clarification: Actually, flash point is the lowest temperature at which the lubricating oil will flash when a small flame is passed across its surface.

8. The flash point of the oil should be sufficiently high so as to avoid flashing of oil vapours at the temperatures occurring in common use.
a) True
b) False
Answer: a
Clarification: None.

9. ____________ is the lowest temperature at which the oil burns continuously.
a) Viscosity
b) Flash point
c) Fire point
d) None of the mentioned
Answer: c
Clarification: Fire point is the lowest temperature at which the oil burns continuously while viscosity is the ability of the oil to resist internal deformation due to mechanical stresses.

10. ____________ is the lowest temperature at which the lubricating oil will pour.
a) Viscosity
b) Pour point
c) Fire point
d) None of the mentioned
Answer: b
Clarification: Pour point is the lowest temperature at which the lubricating oil will pour while fire point is the lowest temperature at which the oil burns continuously and viscosity is the ability of the oil to resist internal deformation due to mechanical stresses.