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Machine Kinematics - Linear Velocity Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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]
ω1.ω2.r
[B]
(ω1-ω2)r
[C]
(ω1+ω2)r
[D]
(ω1-ω2)2r
(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]
ω1.ω2.r
[B]
(ω1-ω2)r
[C]
(ω1+ω2)r
[D]
(ω1-ω2)2r
(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
(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
(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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