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

Questions
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
B12)r
C12)r
D12)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
B12)r
C12)r
D12)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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