511. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
[A]. Right
[B]. Wrong
null
null
✅ The correct answer is option A.
Theory of machines MCQs
512. A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
[A]. 2 mm
[B]. 2.22 mm
[C]. 2.50 mm
[D]. 3.0 mm
✅ The correct answer is option B.
513. The pair is known as a higher pair, when the relative motion between the elements of a pair is
[A]. turning only
[B]. sliding only
[C]. rolling only
[D]. partly turning and partly sliding
✅ The correct answer is option D.
514. The Whitworth quick return motion mechanism is formed in a slider crank chain when the
[A]. coupler link is fixed
[B]. longest link is a fixed link
[C]. slider is a fixed link
[D]. smallest link is a fixed link
✅ The correct answer is option A.