Machine Kinematics Questions and Answers – Linear Velocity | Machine Kinematics Multiple Choice Questions and Answers

(1) The relative velocity of B with respect to A in a rigid link AB is
[A] parallel to AB
[B] perpendicular to AB
[C] along AB
[D] at 45°
Answer: perpendicular to AB
(2) The magnitude of linear velocity of a point B on a link AB relative to point A is
[A] ω x AB
[B] ω(AB)2
[C] ω2AB
[D] (ω x AB)2
Answer: ω x AB

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(3) The direction of linear velocity of any point on a link with respect to another point on the same link is
[A] parallel to the link joining the points
[B] perpendicular to the link joining the points
[C] at 45° to the link joining the points
[D] none of the mentioned
Answer: perpendicular to the link joining the points
(4) The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is
[A] ω12.r
[B] (ω12)r
[C] (ω12)r
[D] (ω12)2r
Answer: (ω12)r
(5) In the above question, if both the links OA and OB turns in clockwise direction, then the rubbing velocity at the pin joint O is
[A] ω12.r
[B] (ω12)r
[C] (ω12)r
[D] (ω12)2r
Answer: (ω12)r
(6) ABCD is a four bar mechanism in which AB = 310mm and CD = 450mm. AB and CD are both perpendicular to the fixed link AD. If the velocity of B at this condition is v. Then the velocity of C is
[A] v
[B] 2/3 v
[C] 3/2 v
[D] 9/4 v
Answer: 3/2 v
(7) A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?
[A] All points of the disc have the same velocity.
[B] The centre of the disc has zero acceleration.
[C] The centre of the disc has centrifugal acceleration.
[D] The point on the disc making contact with the plane surface has zero acceleration.
Answer: The centre of the disc has zero acceleration.
(8) The component of the accelertion, parallel to the velocity of the particle, at the given instant is called
[A] radial component
[B] tangential component
[C] coriolis component
[D] none of the mentioned
Answer: tangential component
(9) The component of the accelertion, perpendicular to the velocity of the particle, at the given instant is called
[A] radial component
[B] tangential component
[C] coriolis component
[D] none of the mentioned
Answer: radial component
(10) A point B on a rigid link AB moves with respect to A with angular velocity ωrad/s. The total acceleration of B with respect to A will be equal to
[A] vector sum of radial component and coriolis component
[B] vector sum of tangential component and coriolis component
[C] vector sum of radial component and tangential component
[D] vector difference of radial component and tangential component
Answer: vector sum of radial component and tangential component

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