Machine Kinematics

Acceleration in Mechanisms

Question 1
Marks : +2 | -2
Pass Ratio : 25%
The fixed instantaneous center of mechanism
varies with the configuration
remains at the same place for all configurations
all of the mentioned
none of the mentioned
Explanation:
The fixed instantaneous center of mechanism remains at the same place for all configurations.
Question 2
Marks : +2 | -2
Pass Ratio : 25%
Angular acceleration of a link AB is given by
centripetal acceleration/length
tangential acceleration/length
total acceleration/length
none of the mentioned
Explanation:
None.
Question 3
Marks : +2 | -2
Pass Ratio : 25%
The instantaneous centers of a slider moving in a curved surface lies at
infinity
their point of contact
the center of curvature
the pin point
Explanation:
The instantaneous centers of a slider moving in a linear guide lies at infinity.
Question 4
Marks : +2 | -2
Pass Ratio : 25%
The component of the acceleration directed towards the center of rotation of a revolving body is known as ____________ component.
tangential
centripetal
coriolis
none of the mentioned
Explanation:
The centripetal or radial component, which is perpendicular to the velocity of the particle at the given instant.
Question 5
Marks : +2 | -2
Pass Ratio : 25%
The locus of instantaneous center of a moving body relative to a fixed body is known as the
space centrode
body centrode
moving centrode
none of the mentioned
Explanation:
The locus of the instantaneous centre in space during a definite motion of the body is called the space centrode and the locus of the instantaneous centre relative to the body itself is called the body centrode.
Question 6
Marks : +2 | -2
Pass Ratio : 25%
A slider moves with uniform velocity v on a revolving link of length r with angular velocity of ω. The Coriolis acceleration component of a point on the slider relative to a coincident point on the link is equal to
2rω parallel to the link
2ωv perpendicular to the link
2rω perpendicular to the link
2ωv parallel to the link
Explanation:
The coriolis component is always perpendicular to the link and is given by 2ωv.
Question 7
Marks : +2 | -2
Pass Ratio : 25%
At an instant, if the angular velocity of a link is clockwise then the angular acceleration will be
clockwise
counterclockwise
in any direction
none of the mentioned
Explanation:
None.
Question 8
Marks : +2 | -2
Pass Ratio : 25%
The space centrode of a circular disc rolling on a straight path is
circle
parabola
a straight line
none of the mentioned
Explanation:
The instantaneous center of rotation of a circular disc rolling on a straight path is at their point of contact.
Question 9
Marks : +2 | -2
Pass Ratio : 25%
The instantaneous center of rotation of a circular disc rolling on a straight path is
at the center of the disc
at their point of contact
at the center of gravity of the disc
at infinity
Explanation:
The space centrode of a circular disc rolling on a straight path is a straight line.
Question 10
Marks : +2 | -2
Pass Ratio : 25%
At an instant the link AB of length r has an angular velocity ω and an angular acceleration α. What is the total acceleration of AB?
[(ω2r)2 + αr)2]1/2
[(ωr)2 + αr)2]1/2
[(ω2r)2 + αr)]1/2
[(ω2r)2 + αr)2]1/2
Explanation:
None.