Engineering Questions with Answers - Multiple Choice Questions
Machine Kinematics MCQ – Acceleration in Mechanisms
1 - Question
The instantaneous centers of a slider moving in a curved surface lies at
a) infinity
b) their point of contact
c) the center of curvature
d) the pin point
View Answer
Answer: c
Explanation: The instantaneous centers of a slider moving in a linear guide lies at infinity.
The instantaneous centers of a slider moving in a curved surface lies at the center of curvature.
2 - Question
The fixed instantaneous center of mechanism
a) varies with the configuration
b) remains at the same place for all configurations
c) all of the mentioned
d) none of the mentioned
View Answer
Answer: b
Explanation: The fixed instantaneous center of mechanism remains at the same place for all configurations.
The instantaneous centres which vary with the configuration of the mechanism, are called neither fixed nor permanent instantaneous centres.
3 - Question
The instantaneous center of rotation of a circular disc rolling on a straight path is
a) at the center of the disc
b) at their point of contact
c) at the center of gravity of the disc
d) at infinity
View Answer
Answer: b
Explanation: The space centrode of a circular disc rolling on a straight path is a straight line.
4 - Question
The locus of instantaneous center of a moving body relative to a fixed body is known as the
a) space centrode
b) body centrode
c) moving centrode
d) none of the mentioned
View Answer
Answer: a
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.
5 - Question
The space centrode of a circular disc rolling on a straight path is
a) circle
b) parabola
c) a straight line
d) none of the mentioned
View Answer
Answer: c
Explanation: The instantaneous center of rotation of a circular disc rolling on a straight path is at their point of contact.
6 - Question
The component of the acceleration directed towards the center of rotation of a revolving body is known as ____________ component.
a) tangential
b) centripetal
c) coriolis
d) none of the mentioned
View Answer
Answer: b
Explanation: The centripetal or radial component, which is perpendicular to the velocity of the particle at the given instant.
The tangential component, which is parallel to the velocity of the particle at the given instant.
7 - Question
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?
a) [(ω2r)2 + αr)2]1/2
b) [(ωr)2 + αr)2]1/2
c) [(ω2r)2 + αr)]1/2
d) [(ω2r)2 + αr)2]1/2
View Answer
Answer: a
Explanation: None.
8 - Question
At an instant, if the angular velocity of a link is clockwise then the angular acceleration will be
a) clockwise
b) counterclockwise
c) in any direction
d) none of the mentioned
View Answer
Answer: c
Explanation: None.
9 - Question
Angular acceleration of a link AB is given by
a) centripetal acceleration/length
b) tangential acceleration/length
c) total acceleration/length
d) none of the mentioned
View Answer
Answer: b
Explanation: None
10 - Question
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
a) 2rω parallel to the link
b) 2ωv perpendicular to the link
c) 2rω perpendicular to the link
d) 2ωv parallel to the link
View Answer
Answer: b
Explanation: The coriolis component is always perpendicular to the link and is given by 2ωv.