1. When a slider moves on a fixed link having curved surface, their instantaneous centre lies
a) on their point of contact
b) at the centre of curvature
c) at the centre of circle
d) at the pin joint
Explanation: When a slider moves on a fixed link having curved surface, their instantaneous centre lies at the centre of curvature.
When a slider moves on a fixed link having straight surface their instantaneous center lies at infinity.
2. A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the center of the circle.
a) True
b) False
Explanation: True
3. The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at
a) the centre of the disc
b) the point of contact
c) an infinite distance on the plane surface
d) the point on the circumference situated vertically opposite to the contact point
Explanation: The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at the point of contact
4.In its simplest form, a cam mechanism consists of following number of links
a) 1
b) 2
c) 3
d) 4
Explanation: Cam consists of 3 links.
5. Which of the following mechanisms produces mathematically an exact straight line motion?
a) Grasshopper mechanism
b) Watt mechanism
c) Peaucellier’s mechanism
d) Tchabichiff mechanism
Explanation: Peaucellier’s mechanism gives straight line motion.
6. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links
a) will remain same
b) will change
c) will not occur
d) none of the mentioned
Explanation: There will be no change.
7. A kinematic chain requires at least
a) 2 links and 3 turning pairs
b) 3 links and 4 turning pairs
c) 4 links and 4 turning pairs
d) 5 links and 4 turning pairs
Explanation: In a Kinematic chain, the number of links should be equal to the number of turning pairs.
8. In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
a) equal to sum of other two
b) greater than sum of other two
c) less than sum of other two
d) none of the mentioned
Explanation: less than sum of other two
9. The following is the inversion of slider crank chain mechanism
a) whitworth quick return mechanism
b) hand pump
c) oscillating cylinder engine
d) all of the mentioned
Explanation: All of the mentioned
10. Kinematic pairs are those which have
a) two elements held together mechanically
b) two elements having relative motion
c) two elements having Coroli’s component
d) none of the mentioned
Explanation: Kinematic pair is ajoint of two elements that permits relative motion.