Theory of Machines LAB VIVA Questions :-
1. An apparatus for applying mechanical power, consisting of a number of interrelated parts, each having a definite function.
2. Dealing with the relative motion between the parts, without caring for forces involved.
3. Dealing with the forces acting on the parts of the machine.
4. A resistant body constituting a part of a machine connecting other parts having motion relative to it.
5. An assemblage of resistant bodies having no relative motion between them.
6. A joint of two elements permitting relative motion.
7. Elements of pairs held together mechanically.
8. A pair having a surface contact between the two elements while in motion.
9. A pair having a point contact or line contact.
10. A number of links connected in space such that relative motion of any point on a link with respect to any other point on the other link follows a definite law.
11. Each _______ pair is treated as equivalent to two lower pairs and an additional link.
12. The relationship between number of links (L) and number of joints (J) for a kinematic chain.
13. A ball and socket joint forms ______ pair.
14. Crank shaft and bearing constitute a ______ pair.
15. If one of the links of a constrained kinematic chain is fixed, it constitutes ______.
16. An assemblage of links to obtain mechanical advantage.
17. Different mechanisms obtained by fixing different links in a kinematic chain.
18. A cam and follower constitute _______ pair.
19. The sum of the shortest and the longest links of a planar four- bar linkage can not be greater than the sum of the remaining two links if there is to be continuous relative rotation between two links.
20. A four-bar kinematic chain containing two turning pairs and two translatory pairs such that two pairs of the same kind are adjacent.
21. If the number of links in a chain is more than four and Klein criterion of constraint applies.
22. As per Klein criterion of constraint, if (number of binary joints 4 i/2 x number of higher pairs) = (3/2 x number of links – 2), then chain is_____.
23. In a kinematic chain, a ternary joint is equivalent to _____ binary joints.
24. In a kinematic chain, a quaternary joint is equivalent to _______ binary joints.
25. The kinematic chain having N links will have ______ inversions.
26. Unconstrained rigid link in a plane has _______ degrees of freedom.
27. The two rigid links have no linear velocities relative to each other at the ______.
28. If n = number of links in a chain, then number of instantaneous centres is ______.
29. If three kinematic links have plane motions, their instantaneous centres lie on a ______.
30. Two rigid links at their instantaneous centre have the same linear velocity relative to the ______link.
31. Two links L1 and L2 have angular velocities co^ (clockwise) and co2 (anti-clockwise). The angular velocity of L1 relative to L2 is______.
32. Simple graphical construction for determining the acceleration polygon.
33. The direction of Coriolis component acceleration is the direction of relative velocity vector for the two coincident points rotated by _______ in the direction of the angular velocity of the rotation of the link.
34. Klein’s construction is mainly used to determine the _______ of piston.
36. A link AB of length I rotates about point A and tangential acceleration of B relative to A is at and normal acceleration is cc„. Angular accleration of link A is ______.
37. Ritterhan’s construction and Bennet’s construction are used to determine _______ of piston in reciprocating engines.
38. A slider slides along a straight link with uniform velocity v and the link rotates about a point with uniform angular velocity co, then Corioli’s component of acceleration of a point on slider relative to coincident point on link is equal to _____ and perpendicular to link.
39. Corioli’s component acceleration exists whenever a point moves along a path that has ______ motion.
40. Coriolis component acceleration acts in a direction _______ to sliding surfaces.
41. The direction of Coriolis component acceleration is such that it ______ the sliding velocity vector by 90°.
42. Belt dynamometer is classified as ______ type dynamometer.
43. Prony brake as well as Froude’s hydraulic dynamometers are classified as _______ type dynamometers.
44. The stopping distance of any vehicle is proportional to _______ of the velocity of vehicle.
45. Maximum fluctuation of energy of a flywheel is proportional to square of ______.
46. A flywheel has _______ influence on mean speed of the prime mover.
47. A governor has ……. influence over cyclic speed fluctuation.
48. The ratio of the difference between maximum and minimum speed to the mean equilibrium speed.
49. The balls occupy a definite specified position for each speed within the working range.
50. When the equilibrium speed is constant for all radii of rotation of the balls of governor within the worknig range.
51. When a governor tends to intensify the speed variations instead of controlling it.
52 _______maintains the speed within prescribed limits for varying output.
53 _______governor is spring loaded type governor.
54 _______governor is gravity controlled type governor.
ANSWER::
1. machine
2. kinematics
3. dynamics
4. kinematic link
5. structure
6. kinematic pair
7. closed pairs
8. lower pair
9. higher pair
10. kinematic chain
11. higher
12. L = [2/3(J+2)]
13. spherical
14. lower
15. mechanism
16. machine
17. inversions
18. higher
19. Grashofs law
20. double slider crank chain
21. compound chain
22. constrained
23. two
24. three
25. N
26. three
27. instantaneous centre
28. [ n(n-1)/2 ]
29. straight line
30. third
31. (w1 + w2)
32. Klein construction
33. (90°)
34. linear acceleratio
36. (Infinity of t/l)
37. acceleration
38. (2wv)
39. rotational
40. perpendicular
41. leads
42. transmission
43. absorption
44. square
45. angular speed
46. no
47. no
48. sensitivity
49. stability
50. isochronism
51. hunting
52. governor
53. Hartnell
54. Proel