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Mechanical - Kinematics of Machinery - Kinematics Of Linkage Mechanisms - Important Short Questions and Answers: Kinematics Of Linkage Mechanisms

**1. What are the components of acceleration?**

Radial
component of acceleration

Tangential
component of acceleration

**2. Write an expression for find number of
instantaneous centers in a** **mechanism.**

N=n(n-1)/2, n-no
of links

**3. What
is expression for Coriolis componenet of acceleration?**

** **a BC

=2rw

Where w=Angular
velocity of

‘OA’
V=Linear velocity of ‘B’

**4.
****How can
we represent the direction of linear velocity of any point on a link with
respect to another point on the same link?**

The
direction of linear velocity of any point on a link with respect to another
point on the

same link
the direction is perpendicular to the line joining the points.

**5.
****What is
the expression for radial and tangential component of acceleration?**

Radial
component

Arc

OB=wOB*OB Tangential component

Arc OB=aOB*OB

Where wOB=Angular
velocity of link OB aOB=Angular
acceleration of link OB OB=Length of link OB.

(Radial
component of acceleration is perpendicular to the velocity of the component and

tangential
component is perpendicular to link position)

**6. Define instantaneous center and instantaneous
axis?**

Instantaneous center of a moving body may be
defined as that center which goes on changing from one instant to another.

Instantaneous axis is a line drawn through an
instantaneous center and perpendicular to the plane of motion.

**7.
****What are
the names of instantaneous center?**

Virtual
center Centro Rotopole.

**8.
****How can
we apply instantaneous center method to determine velocity?**

Consider
three points A, B, C on a rigid link. I am being instantaneous Center. Let VA,

VB, VC be the points A, B & C. Then we have

VA/IA=VB/IB=VC/IC

**9. What is
the objective of Kinematic analysis?**

The
objective of Kinematic analysis is to determine the Kinematic quantities such
as displacement, velocity and acceleration of the element in a mechanism.

**10. Write any two rules to locate Instantaneous
center.**

When two
links are connected by a pin joint the instantaneous center lies on the center
of

the pin.

When two links have a sliding contact, the
instantaneous center lies at infinity in a direction perpendicular to the path
of motion of slide.

**11. Define Kennedy’s theorem.**

The
Kennedy’s theorem states that if three bodies move relatively to each other,
they

have
three instantaneous centers and lie on a straight line.

**12. What is meant by efficiency of a mechanism?**

Efficiency
of a mechanism is defined as the ratio of the product of force and velocity in

driven link
to the product of force and velocity in driving link.

**13. A pin joins two links A & B. A rotates with
**w**A angular
velocity and B rotates with**

w**B angular velocity in opposite
direction. What is the rubbing velocity of that point?**

Rubbing
velocity of pin = ( wA + wB ) * r Where ‘r’ is the radius of pin.

**14. What is the magnitude of linear velocity of a
point B on a link AB relative to A?**

The
magnitude of linear velocity of a point B on a link AB, which rotates with

‘w’ angular velocity with respect to A is: VB/A =w A/B *AB

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Mechanical : Kinematics of Machinery : Kinematics Of Linkage Mechanisms : Important Short Questions and Answers: Kinematics Of Linkage Mechanisms |

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