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In order to draw the acceleration diagram, it is necessary to determine the Coriolis component of acceleration in case of

crank and slotted lever quick return mechanism

slider crank mechanism

four bar mechanism

pantograph

All of the following statements about Coriolis component of acceleration are correct, except

Coriolis component of acceleration exists only when a point moves along a straight line which itself has rotational motion

Coriolis component of acceleration acts in a direction inclined to sliding surfaces depending upon the ratio of the normal acceleration to tangential acceleration

The two points, one on the link which slides, are assumed to be coincident

Coriolis component of acceleration is encountered both in shaper mechanism and oscillating cylinder mechanism

Consider the mechanisms mentioned below: four bar chains, slider crank, quick return motion. The Coriolis component acceleration is encountered in

four bar chain only

slider crank only

quick return motion only

four bar chain as well as quick return motion

The direction of Coriolis component of acceleration is the direction

at right angles to that of relative angular velocity vector

relative to velocity for two coincident points rotated by 180° in the direction of angular velocity of rotation of link

of relative velocity vector for two coincident points rotated by 90° in the direction of angular velocity of rotation of link

of relative velocity vector for two coincident points in the direction exactly opposite of that of angular velocity

The Coriolis component of acceleration

leads the sliding velocity vector by 180°

rotates the sliding velocity vector about its origin along the direction of velocity

is directed along the sliding velocity vector

is directed along the tangential acceleration

A slider on a link rotating at 60 rpm slides with a linear velocity of 10 cm/s. The magnitude of Coriolis component of acceleration is______

/

1 and 2

1 and 3

2 and 4

1 and 4

Coriolis component of acceleration exists whenever a point moves along a path that has

tangential acceleration

centripetal acceleration

linear motion

rotation motion

Identify the wrong statement pertaining to location of instantaneous centre in a mechanism

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

when two links have a pure rolling contact ( rolling without slipping), the instantaneous centre lies on their point of contact

When a slider moves on a fixed link having straight surface, the instantaneous centre lies at infinity

When a slide moves on a fixed link having curved surface, the instantaneous centers lies on the centre of curvature path

none of the above

A line drawn through an instantaneous centre and perpendicular to the plane of motion is called instantaneous axis. The locus of this axis is known as

centrode

body centrode

space centrode

axode

Identify the wrong statement :

The instantaneous centre of a moving body goes on changing from one instant to another, and the locus of all such instantaneous centers is known as centrode

The instantaneous centers which remain in the same place for all configurations of the machine are called fixed instantaneous centers

Three bodies moving relatively to each other have three instantaneous centers

Two rigid links will tend to rotate instantaneously relative to each other at the instantaneous centre

Consider a point on a link connecting double slider crank chain. It would trace

a circular path

an elliptical path

a straight line path

a parabolic path

Identify the incorrect statement/statements

Tangential acceleration acts in the direction of motion at the instant considered

Centripetal acceleration acts along the line perpendicular to the path of rotation and towards the centre of curvature

A point at the end of a link is stated to move with a constant angular velocity. Its acceleration will be zero

When a point moves along a straight line, its acceleration will have tangential component only

A crank of radius 12 cm is rotating at 60 rpm with an angular acceleration of 50 rad/sec2. The tangential acceleration of the crank is about

4.75 m/s2

5.2 m/s2

6 m/s2

7.4 m/s2

A point B on a rigid link AB moves with respect to point A with angular velocity 1 rad/sec and the link itself has an angular acceleration 1 rad/sec2. The total acceleration of B relative to A would be directed along a direction

parallel to AB

at an angle of 90° to AB

at an angle of 45° to AB

at an angle of 60° AB

Which one of the statements given below is not correct regarding Klien’s construction?

It is a graphical method for construction of velocity polygon

It can be applied when the crank has uniform

It may equally be applied when the crank has an angular velocity and an angular acceleration

It helps to determine the acceleration of various parts of the mechanism

Magnitude of linear velocity of any point on a kinematic link relative to another point in the same link is

zero

product of angular velocity of the link and the distance between the points

product of angular velocity of the link and the square of distance between the points

product of square of angular velocity of the link and the distance between the points

The Klien’s method of construction for reciprocating engine mechanism

is a simplified version of instantaneous method

utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

enables determination of coriolis component

is based on the acceleration diagram

Klien’s construction is applicable when the crank has

slow rotational speed

uniform angular velocity

uniform angular acceleration

cyclic variations in velocity and acceleration

Klien’s construction is mainly used to determine

displacement of piston

linear velocity and acceleration of piston

angular velocity of connecting rod

angular acceleration of crank

Three bodies moving relative to each other

have only one instantaneous centre

have two instantaneous centers and these two centers lie on a circle

have three instantaneous centers and these three centers lie on a straight line

have three instantaneous centers and these three centers lie on a curved line

A mechanism has 7 links which are all binary except one which is ternary. The number of instantaneous centers rotation will be

14

21

28

42

The number of links and instantaneous centres in a reciprocating engine mechanism are respectively

4,4

4,3

4,6

4,12

A four bar mechanism has……………………… instantaneous centers of rotation

2

4

6

8

The direction of relative velocity of two points in a rigid link is

along the line joining the two points

perpendicular to the line joining the two points

parallel to the line joining the points

dependent upon the rigidity of the link

Instantaneous centre of motion of a piston

centre of crank pin

centre of piston pin

centre of crankshaft bearing

infinity

The instantaneous centre of rotation of a rigid thin disc rolling on a plane rigid surface is located at

the centre of the disc

an infinite distance on the plane surface

the point of contact

the point on circumference situated vertically opposite to the contact point

The total number of instantaneous centers for a mechanism with n-links are

n

(n – 1)

n(n – 1)

n(n – 1) 2

n/2

crank and slotted lever quick return mechanism

slider crank mechanism

four bar mechanism

pantograph

All of the following statements about Coriolis component of acceleration are correct, except

Coriolis component of acceleration exists only when a point moves along a straight line which itself has rotational motion

Coriolis component of acceleration acts in a direction inclined to sliding surfaces depending upon the ratio of the normal acceleration to tangential acceleration

The two points, one on the link which slides, are assumed to be coincident

Coriolis component of acceleration is encountered both in shaper mechanism and oscillating cylinder mechanism

Consider the mechanisms mentioned below: four bar chains, slider crank, quick return motion. The Coriolis component acceleration is encountered in

four bar chain only

slider crank only

quick return motion only

four bar chain as well as quick return motion

The direction of Coriolis component of acceleration is the direction

at right angles to that of relative angular velocity vector

relative to velocity for two coincident points rotated by 180° in the direction of angular velocity of rotation of link

of relative velocity vector for two coincident points rotated by 90° in the direction of angular velocity of rotation of link

of relative velocity vector for two coincident points in the direction exactly opposite of that of angular velocity

The Coriolis component of acceleration

leads the sliding velocity vector by 180°

rotates the sliding velocity vector about its origin along the direction of velocity

is directed along the sliding velocity vector

is directed along the tangential acceleration

A slider on a link rotating at 60 rpm slides with a linear velocity of 10 cm/s. The magnitude of Coriolis component of acceleration is______

/

1 and 2

1 and 3

2 and 4

1 and 4

Coriolis component of acceleration exists whenever a point moves along a path that has

tangential acceleration

centripetal acceleration

linear motion

rotation motion

Identify the wrong statement pertaining to location of instantaneous centre in a mechanism

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

when two links have a pure rolling contact ( rolling without slipping), the instantaneous centre lies on their point of contact

When a slider moves on a fixed link having straight surface, the instantaneous centre lies at infinity

When a slide moves on a fixed link having curved surface, the instantaneous centers lies on the centre of curvature path

none of the above

A line drawn through an instantaneous centre and perpendicular to the plane of motion is called instantaneous axis. The locus of this axis is known as

centrode

body centrode

space centrode

axode

Identify the wrong statement :

The instantaneous centre of a moving body goes on changing from one instant to another, and the locus of all such instantaneous centers is known as centrode

The instantaneous centers which remain in the same place for all configurations of the machine are called fixed instantaneous centers

Three bodies moving relatively to each other have three instantaneous centers

Two rigid links will tend to rotate instantaneously relative to each other at the instantaneous centre

Consider a point on a link connecting double slider crank chain. It would trace

a circular path

an elliptical path

a straight line path

a parabolic path

Identify the incorrect statement/statements

Tangential acceleration acts in the direction of motion at the instant considered

Centripetal acceleration acts along the line perpendicular to the path of rotation and towards the centre of curvature

A point at the end of a link is stated to move with a constant angular velocity. Its acceleration will be zero

When a point moves along a straight line, its acceleration will have tangential component only

A crank of radius 12 cm is rotating at 60 rpm with an angular acceleration of 50 rad/sec2. The tangential acceleration of the crank is about

4.75 m/s2

5.2 m/s2

6 m/s2

7.4 m/s2

A point B on a rigid link AB moves with respect to point A with angular velocity 1 rad/sec and the link itself has an angular acceleration 1 rad/sec2. The total acceleration of B relative to A would be directed along a direction

parallel to AB

at an angle of 90° to AB

at an angle of 45° to AB

at an angle of 60° AB

Which one of the statements given below is not correct regarding Klien’s construction?

It is a graphical method for construction of velocity polygon

It can be applied when the crank has uniform

It may equally be applied when the crank has an angular velocity and an angular acceleration

It helps to determine the acceleration of various parts of the mechanism

Magnitude of linear velocity of any point on a kinematic link relative to another point in the same link is

zero

product of angular velocity of the link and the distance between the points

product of angular velocity of the link and the square of distance between the points

product of square of angular velocity of the link and the distance between the points

The Klien’s method of construction for reciprocating engine mechanism

is a simplified version of instantaneous method

utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

enables determination of coriolis component

is based on the acceleration diagram

Klien’s construction is applicable when the crank has

slow rotational speed

uniform angular velocity

uniform angular acceleration

cyclic variations in velocity and acceleration

Klien’s construction is mainly used to determine

displacement of piston

linear velocity and acceleration of piston

angular velocity of connecting rod

angular acceleration of crank

Three bodies moving relative to each other

have only one instantaneous centre

have two instantaneous centers and these two centers lie on a circle

have three instantaneous centers and these three centers lie on a straight line

have three instantaneous centers and these three centers lie on a curved line

A mechanism has 7 links which are all binary except one which is ternary. The number of instantaneous centers rotation will be

14

21

28

42

The number of links and instantaneous centres in a reciprocating engine mechanism are respectively

4,4

4,3

4,6

4,12

A four bar mechanism has……………………… instantaneous centers of rotation

2

4

6

8

The direction of relative velocity of two points in a rigid link is

along the line joining the two points

perpendicular to the line joining the two points

parallel to the line joining the points

dependent upon the rigidity of the link

Instantaneous centre of motion of a piston

centre of crank pin

centre of piston pin

centre of crankshaft bearing

infinity

The instantaneous centre of rotation of a rigid thin disc rolling on a plane rigid surface is located at

the centre of the disc

an infinite distance on the plane surface

the point of contact

the point on circumference situated vertically opposite to the contact point

The total number of instantaneous centers for a mechanism with n-links are

n

(n – 1)

n(n – 1)

n(n – 1) 2

n/2

This paper consists of 28 questions which are required to be finished in an hours time approximately.

Velocity and Acceleration in Mechanisms Theory Of Mechanisms And Machines MECHANICAL ENGINEERING

what about DOF grubler grashoff

other mechanisms like grashopper

and some questions from that too

2610 days 5 hours 9 minutes ago

Good effort to help young engineers.

This is great ?

You prove as a Royel Mech.

3849 days 7 hours 44 minutes ago

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