Machine Kinematics Multiple Choice Questions on ” Velocity of a Point on a Link by Relative Velocity Method”.
1. The instantaneous centre is a point which is always fixed.
a) True
b) False
Answer: b
Clarification: The instantaneous center is not always fixed.
2. The angular velocity of a rotating body is expressed in terms of
a) revolution per minute
b) radians per second
c) any one of the mentioned
d) none of the mentioned
Answer: c
Clarification: Angular velocity is expressed both as revolution per minute and radians per second.
3. The linear velocity of a rotating body is given by the relation
a) v = rω
b) v = r/ω
c) v = ω/r
d) v = ω2/r
Answer: a
Clarification: The linear velocity of a rotating body is given by the relation v = rω
The linear acceleration of a rotating body is given by the relation a = rα.
4. The linear acceleration of a rotating body is given by the relation
a) a = rα
b) a = r/α
c) a = α/r
d) a = α2/r
Answer: a
Clarification: The linear velocity of a rotating body is given by the relation v = rω
The linear acceleration of a rotating body is given by the relation a = rα.
5. The relation between linear velocity and angular velocity of a cycle
a) exists under all conditions
b) does not exist under all conditions
c) exists only when it does not slip
d) exists only when it moves on horizontal plane
Answer: a
Clarification: None.
6. The velocity of piston in a reciprocating pump mechanism depends upon
a) angular velocity of the crank
b) radius of the crank
c) length of the connecting rod
d) all of the mentioned
Answer: d
Clarification: None.
7. The linear velocity of a point B on a link rotating at an angular velocity ω relative to another point A on the same link is
a) ω2AB
b) ωAB
c) ω(AB)2
d) ω/AB
Answer: b
Clarification: None.
8. The linear velocity of a point relative to another point on the same link is ……….. to the line joining the points.
a) perpendicular
b) parallel
c) at 450
d) none of the mentioned
Answer: a
Clarification: The total linear acceleration of a particle can be obtained by combining the two mutually perpendicular accelerations.
9. According to Kennedy’s theorem the instantaneous centres of three bodies having relative motion lie on a
a) curved path
b) straight line
c) point
d) none of the mentioned
Answer: b
Clarification: The Aronhold Kennedy’s theorem states that if three bodies move relatively to each other, they have three instantaneous centres and lie on a straight line.
10. The instantaneous centers of a slider moving in a linear guide lies at
a) pin joints
b) their point of contact
c) infinity
d) none of the mentioned
Answer: c
Clarification: The instantaneous centers of a slider moving in a linear guide lies at infinity.
The instantaneous centers of a slider moving in a curved surface lies at the center of curvature.