Machine Kinematics Questions and Answers – Friction of Pivot and Collar Bearing

This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on “Friction of Pivot and Collar Bearing”.

1. The power from the engine to the rear axle of an automobile is transmitted by means of
a) worm and worm wheel
b) spur gears
c) bevel gears
d) hooke’s joint
View Answer

Answer: d
Explanation: A Hooke’s joint is used to connect two shafts, which are intersecting at a small angle. In automobiles, the power is transmitted through this only.

2. A force acting in the opposite direction to the motion of the body is called force of friction.
a) True
b) False
View Answer

Answer: a
Explanation: The force of friction always acts in a direction, opposite to that in which the body tends to move.

3. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
a) static friction
b) dynamic friction
c) limiting friction
d) coefficient of friction
View Answer

Answer: c
Explanation: The friction, experienced by a body, when at rest, is known as static friction.
The friction, experienced by a body, when in motion, is known as dynamic friction.
The maximum frictional force, which comes into play, when a body just begins to slide over
the surface of the other body, is known as limiting friction.
advertisement
advertisement

4. The friction experienced by a body, when at rest, is known as static friction.
a) True
b) False
View Answer

Answer: a
Explanation: The friction, experienced by a body, when at rest, is known as static friction.
The friction, experienced by a body, when in motion, is known as dynamic friction.
The maximum frictional force, which comes into play, when a body just begins to slide over
the surface of the other body, is known as limiting friction.

5. The dynamic friction is the friction experienced by a body, when the body
a) is in motion
b) is at rest
c) just begins to slide over the surface of the other body
d) none of the mentioned
View Answer

Answer: a
Explanation: The friction, experienced by a body, when at rest, is known as static friction.
The friction, experienced by a body, when in motion, is known as dynamic friction.
The maximum frictional force, which comes into play, when a body just begins to slide over
the surface of the other body, is known as limiting friction.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

6. The static friction
a) bears a constant ratio to the normal reaction between the two surfaces
b) is independent of the area of contact, between the two surfaces
c) always acts in a direction, opposite to that in which the body tends to move
d) all of the mentioned
View Answer

Answer: d
Explanation: The laws of static friction are:
a) The force of friction always acts in a direction, opposite to that in which the body tends to move.
b) The magnitude of the force of friction is exactly equal to the force, which tends to move.
c) The force of friction is independent of the area of contact, between the two surfaces.
d) The force of friction depends upon the roughness of the surfaces.

7. Which of the following statements regarding laws governing the friction between dry surfaces are correct?
a) The friction force is dependent on the materials of the contact surfaces.
b) The friction force is directly proportional to the normal force.
c) The friction force is independent of the area of contact.
d) All of the mentioned
View Answer

Answer: d
Explanation: The laws of friction between dry surfaces are:
a) The force of friction always acts in a direction, opposite to that in which the body tends to move.
b) The magnitude of the force of friction is exactly equal to the force, which tends to move.
c) The force of friction is independent of the area of contact, between the two surfaces.
d) The force of friction depends upon the roughness of the surfaces.
advertisement

8. The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.
a) True
b) False
View Answer

Answer: b
Explanation: The angle of the inclined plane at which the body just begins to slide down the plane, is called angle of repose.

9. The angle which the normal reaction makes with the resultant reaction is called angle of friction.
a) True
b) False
View Answer

Answer: a
Explanation: The angle of the inclined plane at which the body just begins to slide down the plane, is called angle of repose. The angle which the normal reaction makes with the resultant reaction is called angle of friction.
advertisement

10. The angle of inclination of the plane, at which the body begins to move down the plane is called
a) angle of friction
b) angle of repose
c) angle of projection
d) none of the mentioned
View Answer

Answer: b
Explanation: The angle of the inclined plane at which the body just begins to slide down the plane, is called angle of repose. The angle which the normal reaction makes with the resultant reaction is called angle of friction.

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.

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

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
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.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.