Machine Kinematics Questions and Answers – Friction Between Lubricated Surfaces

This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on “Friction Between Lubricated Surfaces”.

1. _____________ is the friction, experienced by a body, due to the motion of rotation as in case of foot step bearings.
a) Pivot friction
b) Solid friction
c) Dry friction
d) None of the mentioned
View Answer

Answer: a
Explanation: Pivot friction is the friction, experienced by a body, due to the motion of rotation as in case of foot step bearings.

2. ______________ is the friction experienced between two dry and unlubricated surfaces in contact.
a) Pivot friction
b) Solid friction
c) Boundary friction
d) None of the mentioned
View Answer

Answer: b
Explanation: The friction experienced between two dry and unlubricated surfaces in contact is known as dry or solid friction. It is due to the surface roughness.

3. ______________ is the friction, experienced between the rubbing surfaces, when the surfaces have a very thin layer of lubricant.
a) Pivot friction
b) Solid friction
c) Boundary friction
d) None of the mentioned
View Answer

Answer: c
Explanation: Boundary friction It is the friction, experienced between the rubbing surfaces, when the surfaces have a very thin layer of lubricant. The thickness of this very thin layer is of the molecular dimension.
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4. _____________ is the friction, experienced between the rubbing surfaces, when the surfaces have a thick layer of the lubricant.
a) Fluid friction
b) Solid friction
c) Boundary friction
d) None of the mentioned
View Answer

Answer: a
Explanation: Fluid friction is the friction, experienced between the rubbing surfaces, when the surfaces have a thick layer of the lubricant. In this case, the actual surfaces do not come in contact and thus do not rub against each other.

5. _____________ is a measure of the resistance offered to the sliding one layer of the lubricant over an adjacent layer.
a) Viscocity
b) Density
c) Oiliness
d) None of the mentioned
View Answer

Answer: a
Explanation: The viscosity is a measure of the resistance offered to the sliding one layer of the lubricant over an adjacent layer.

6. The absolute viscosity of a lubricant may be defined as the force required to cause a plate of unit area to slide with unit velocity relative to a parallel plate.
a) True
b) False
View Answer

Answer: a
Explanation: The absolute viscosity of a lubricant may be defined as the force required to cause a plate of unit area to slide with unit velocity relative to a parallel plate, when the two plates are separated by a layer of lubricant of unit thickness.

7. The lubricant which gives ______________ force of friction is said to have greater oiliness.
a) greater
b) lesser
c) similar
d) none of the mentioned
View Answer

Answer: b
Explanation: The lubricant which gives lower force of friction is said to have greater oiliness.
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8. When the lubricants are smeared on two different surfaces, it is found that the force of friction with one lubricant is different than that of the other.
a) True
b) False
View Answer

Answer: a
Explanation: When these lubricants are smeared on two different surfaces, it is found that the force of friction with one lubricant is different than that of the other. This difference is due to the property of the lubricant known as oiliness.

Sanfoundry Global Education & Learning Series – Machine Kinematics.
To practice all areas of Machine Kinematics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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