[A]. ω1.ω2.r
[B]. ( ω1 – ω2)r
[C]. ( ω1 + ω2)r
[D]. ( ω1 – ω2)2r
✅ The correct answer is option B.
Theory of machines MCQs
502. The cam follower generally used in automobile engines is
[A]. knife edge follower
[B]. fiat faced follower
[C]. spherical faced follower
[D]. roller follower
✅ The correct answer is option C.
503. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
[A]. lower pair
[B]. higher pair
[C]. self-closed pair
[D]. force-closed pair
✅ The correct answer is option A.
504. The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
[A]. pitch circle
[B]. base circle
[C]. pitch curve
[D]. prime circle
✅ The correct answer is option C.
505. 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.
506. 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.
507. 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.
508. 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.
509. 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.
510. 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.