Theory of Machines MCQs

1.What defines higher pairs in mechanical elements?

Contact occurring at a point or along a line between the two moving partsContact involving surface area between the two moving componentsPairs where the elements are not mechanically fastened togetherTwo components that allow movement relative to each otherNone of the above

2.What type of kinematic pair is formed by a cam and a roller follower?

3.What defines open pairs in mechanical elements?

Contact occurs at a point or along a line between the two components during movementThe two parts maintain surface contact while movingPairs consisting of elements that are not mechanically fastened togetherTwo components that allow relative movement between themNone of the above

4.How many links are present in the Hart mechanism?

5.What is the primary drawback of a sliding pair?

6.An eccentric sheave, which is fixed at a single pivot, rotates and imparts oscillating motion to a link that is pivoted at one end and attached to the sheave at the other. How many links does this mechanism contain?

7.How many links are present in the most basic cam mechanism?

8.In a kinematic chain, one link is typically held stationary. What happens to the relative motion of the other links if the fixed link is altered?

9.In a darg link quick return mechanism, the shortest link is always fixed. How does the combined length of the shortest and longest links compare to the sum of the remaining two links?

It matches the total length of the other two linksIt exceeds the total length of the other two linksIt is shorter than the total length of the other two linksNo specific relationship exists between themNone of the above statements are correct

10.What defines kinematic pairs in mechanical systems?

Two components rigidly connectedTwo components that can move relative to each otherTwo components influenced by Coriolis effectsAt least two instantaneous centers of rotationAll the above statements

11.In a four-bar linkage, the crank rotates continuously while the follower performs an oscillating motion. Given the crank length is 50 mm and the follower length is 70 mm, what is the theoretical maximum distance between the fixed pivots of the crank and the follower?

12.In which direction does the inertia force act relative to the acceleration force?

At a right angle to the acceleration forceIn the same direction as the acceleration forceIn the direction opposite to the acceleration forceIn any direction relative to the acceleration force depending on its magnitudeNone of the above

13.In simple harmonic motion (S.H.M.), acceleration is directly proportional to which quantity?

14.In simple harmonic motion, how does the velocity vector relate to the displacement vector in terms of phase difference?

The velocity vector leads the displacement vector by 90°The velocity vector lags behind the displacement vector by 90°The velocity vector leads the displacement vector by 180°The velocity and displacement vectors are synchronized in phaseThe velocity vector can have any phase relationship with displacement

15.How is the polar moment of inertia (IP) of a disc found using a wire suspension and measuring the oscillation frequency (f)?

IP is directly proportional to fIP varies directly with the square of fIP is proportional to the moment of inertia JIP is inversely proportional to fNone of these

Theory of Machines MCQs

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