[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.
Theory of machines MCQs
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.
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.
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
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✅ The correct answer is option A.
In railway axle boxes, the bearing used is
[A]. deep groove ball bearing
[B]. double row self-aligning ball bearing
[C]. double row spherical roller bearing
[D]. cylindrical roller bearing
✅ The correct answer is option C.
The dynamic friction is the friction experienced by a body, when the body
[A]. is in motion
[B]. is at rest
[C]. just begins to slide over the surface of the other body
[D]. none of the above
✅ The correct answer is option A.
When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω2r.
[A]. Right
[B]. Wrong
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✅ The correct answer is option A.
The steering of a ship means
[A]. movement of a complete ship up and down in vertical plane about transverse axis
[B]. turning of a complete ship in a curve towards right or left, while it moves forward
[C]. rolling of a complete ship side-ways
[D]. none of the above
✅ The correct answer is option B.
In under damped vibrating system, the amplitude of vibration
[A]. decreases linearly with time
[B]. increases linearly with time
[C]. decreases exponentially with time
[D]. increases exponentially with time
✅ The correct answer is option C.
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
[A]. dedendum
[B]. addendum
[C]. clearance
[D]. working depth
✅ The correct answer is option A.