Que: A footstep bearing and a rotor of a vertical turbine forms an example of
1. Incompletely constrained motion
2. Partially constrained motion
3. Completely constrained motion
4. Sucessfully constrained motion

 Ans: 4
Explaination: There are six degree of freedon three translation
and three rotational and constarint motion is
 refered when pair of machine element are move or
 rotate in a required motion with unnessesary
 motion are restricted thats type of motion are
 called constrained motion in above example foot step bearing and rotor only 2 degree of freedom 1
rotation cw and acw and 1 translation up and
down but translation dof are restricted by gravity
 self wait of rotor so that type of constrain motion
 are called succesfully constrained motion.