Machine Kinematics

Friction of Pivot and Collar Bearing

Question 1
Marks : +2 | -2
Pass Ratio : 100%
A force acting in the opposite direction to the motion of the body is called force of friction.
True
False
Explanation:
The force of friction always acts in a direction, opposite to that in which the body tends to move.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The power from the engine to the rear axle of an automobile is transmitted by means of
worm and worm wheel
spur gears
bevel gears
hooke’s joint
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.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The friction experienced by a body, when at rest, is known as static friction.
True
False
Explanation:
The friction, experienced by a body, when at rest, is known as static friction.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The static friction
The force of friction always acts in a direction, opposite to that in which the body tends to move.
The magnitude of the force of friction is exactly equal to the force, which tends to move.
The force of friction is independent of the area of contact, between the two surfaces.
The force of friction depends upon the roughness of the surfaces.
Explanation:
The laws of static friction are:
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The dynamic friction is the friction experienced by a body, when the body
is in motion
is at rest
just begins to slide over the surface of the other body
none of the mentioned
Explanation:
The friction, experienced by a body, when at rest, is known as static friction.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.
True
False
Explanation:
The angle of the inclined plane at which the body just begins to slide down the plane, is called angle of repose.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The angle of inclination of the plane, at which the body begins to move down the plane is called
angle of friction
angle of repose
angle of projection
none of the mentioned
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.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The angle which the normal reaction makes with the resultant reaction is called angle of friction.
True
False
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.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
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
static friction
dynamic friction
limiting friction
coefficient of friction
Explanation:
The friction, experienced by a body, when at rest, is known as static friction.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statements regarding laws governing the friction between dry surfaces are correct?
The force of friction always acts in a direction, opposite to that in which the body tends to move.
The magnitude of the force of friction is exactly equal to the force, which tends to move.
The force of friction is independent of the area of contact, between the two surfaces.
The force of friction depends upon the roughness of the surfaces.
Explanation:
The laws of friction between dry surfaces are: