Mechanical Engineering: Velocity Acceleration, Mechanism and Machines Online Test

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
Description:

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

Discussion

Karthi

what about DOF grubler grashoff

other mechanisms like grashopper


and some questions from that too

2610 days 5 hours 9 minutes ago

sudhansu kumar biswal

think and then carefully answer.

3750 days 20 hours 33 minutes ago

gopakumar

Good effort to help young engineers.
This is great ?
You prove as a Royel Mech.

3849 days 7 hours 44 minutes ago

GAJANAND GUPTA

good questions...try it atleast one time

3864 days 9 hours 54 minutes ago

Kalyan Sarkar
Psychological interventions in Mathematics Study
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