Theory of Machines – Mechanical Engineering Multiple Choice Questions
1. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts
(a) theory of machines
(b) applied mechanics
(c) mechanisms
(d) kinetics
(e) kinematics.
Ans: d
2. Which of the following disciplines provides study of relative motion between the parts of a machine
(a) theory of machines
(b) applied mechanics
(c) mechanisms
(d) kinetics
(e) kinematics.
Ans: e
3. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts
(a) theory of machines
(b) applied mechanics
(c) mechanisms
(d) kinetics
(e) kinematics.
Ans: a
4. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as
(a) turning pair
(b) rolling pair
(c) sliding pair
(d) spherical pair
(e) lower pair,
Ans: a
5. Which of the following is a lower pair
(a) ball and socket
(b) piston and cylinder
(c) cam and follower
(d) (a) and (b) above
(e) belt drive.
Ans: d
6. If two moving elements have surface contact in motion, such pair is known as
(a) sliding pair
(b) rolling pair
(c) surface pair
(d) lower pair
(e) higher pair.
Ans: e
7. The example of lower pair is
(a) shaft revolving in a bearing
(b) straight line motion mechanisms
(c) automobile steering gear
(d) all of the above
(e) none of the above.
Ans: d
8. Pulley in a belt drive acts as
(a) cylindrical pair
(b) turning pair
(c) rolling pair
(d) sliding pair
(e) surface pair.
Ans: c
9. The example of rolling pair is
(a) bolt and nut
(b) lead screw of a lathe
(c) ball and socket joint
(d) ball bearing and roller bearing
(e) all of the above.
Ans: d
10. Any point on a link connecting double slider crank chain will trace a
(a) straight line
(b) circle
(c) ellipse
(d) parabola
(e) hyperbola.
Ans: c
11. Theipurpose of a link is to
(a) transmit motion
(b) guide other links
(c) act as a support
(d) all of the above
(e) none of the above.
Ans: d
12. A universal joint is an example of
(a) higher pair
(b) lower pair
(c) rolling pair
(d) sliding pair
(e) turning pair.
Ans: b
13. Rectilinear motion of piston is converted into rotary by
(a) cross head
(b) slider crank
(c) connecting rod
(d) gudgeon pin
(e) four bar chain mechanism.
Ans: b
14. Pitch point on a cam is
(a) any point on pitch curve
(b) the point on cam pitch curve having the maximum pressure angle
(c) any point on pitch circle
(d) the point on cam pitch curve having the minimum pressure angle
(e) none of the above.
Ans: b
15. The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be
(a) 0, and more than co2r
(b) 0, and less than coV
(c) 0, 0
(d) cor, 0
(e) none of the above.
Ans: a
16. The example of spherical pair is
(a) bolt andnut
(b) lead screw of a lathe
(c) ball and socket joint
(d) ball bearing and roller bearing
(e) none of the above.
Ans: c
17. Cross head and guides form a
(a) lower pair
(b) higher pair
(c) turning pair
(d) rolling pair
(e) sliding pair.
Ans: e
19. A circular bar moving in a round hole is an example of
(a) incompletely constrained motion
(b) partially constrained motion
(c) completely constrained motion
(d) successfully constrained motion
(e) none of the above
Ans: a
20. If some links are connected such that motion between them can take place in more than one direction, it is called
(a) incompletely constrained motion
(b) partially constrained motion
(c) completely constrained motion
(d) successfully constrained motion
(e) none of the above.
Ans: a
21. If there are L number of links in a mechanism then number of possible inversions is equal to
(a) L + 1
(b) L – 1
(c) L
(d) L + 2
(e) L – 2
Ans: c
22. Kinematic pairs are those which have two elements that
(a) have line contact
(b) have surface contact
(c) permit relative motion
(d) are held together
(e) have dynamic forces.
Ans: c
24. The lower pair is a
(a) open pair
(b) closed pair
(c) sliding pair
(d) point contact pair
(e) does not exist.
Ans: b
25. Automobile steering gear is an example of
(a) higher pair
(b) sliding pair
(c) turning pair
(d) rotary pair
(e) lower pair
Ans: e
26. In higher pair, the relative motion is
(a) purely turning
(b) purely sliding
(c) purely rotary
(d) purely surface contact
(e) combination of sliding and turning.
Ans: e
27. Which of the following has sliding motion
(a) crank
(b) connecting rod
(c) crank pin
(d) cross-head
(e) cross head guide.
Ans: d
28. The ji example of higher pair is
(a) belt, rope and chain drives
(b) gears, cams
(c) ball and roller bearings
(d) all of the above
(e) none of the above.
Ans: d
29. Which of the following mechanism is obtained from lower pair
(a) gyroscope
(b) pantograph
(c) valve and valve gears
(d) generated straight line motions
(e) all of the above
Ans: e
30. Which of the following would constitute a link
(a) piston, piston rings and gudgeon pin
(b) piston, and piston rod
(c) piston rod and cross head
(d) piston, crank pin and crank shaft
(e) piston, piston-rod and cross head.
Ans: e
31. The Scott-Russell mechanism consists of
(a) sliding and turning pairs
(b) sliding and rotary pairs
(c) turning and rotary pairs
(d) sliding pairs only
(e) turning pairs only.
Ans: a
32. Davis steering gear consists of
(a) sliding pairs
(b) turning pairs
(c) rolling pairs
(d) higher pairs
(e) lower pairs.
Ans: a
33. Ackermann steering gear consists of
(a) sliding pairs
(b) turning pairs
(c) rolling pairs
(d) higher pairs
(e) lower pairs.
Ans: b
34. A completely constrained motion can be transmitted with .
(a) 1 link with pin joints
(b) 2 links with pin joints
(c) 3 links with pin joints
(d) 4 links with pin joints
(e) all of the above.
Ans: d
36. Oldham’s coupling is the
(a) second inversion of double slider crank chain
(b) third inversion of double slider crank chain
(c) second inversion of single slider crank chain
(d) third inversion of slider crank chain
(e) fourth inversion of double slider crank chain.
Ans: b
37. Sense of tangential acceleration of a link
(a) is same as that of velocity
(b) is opposite to that of velocity
(c) could be either same or opposite to velocity
(d) is perpendicular to that of velocity
(e) none of the above.
Ans: c
38. A mechanism is an assemblage of
(a) two links
(b) three links
(c) four links or more than four links
(d) all of the above
(e) none of the above.
Ans: c
39. The number of links in pantograph mechanism is equal to
(a) 2
(b) 3
(c) 4
(d) 5
(e) 6.
Ans: c
40. Elements of pairs held together mechanically is known as
(a) closed pair
(b) open pair
(c) mechanical pair
(d) rolling pair
(e) none of the above.
Ans: a
41. Shaft revolving in a bearing is the following type of pair
(a) lower pair
(b) higher pair
(c) spherical pair,
(d) cylindrical pair
(e) bearing pair.
Ans: a
42. Rectangular bar in a rectangular hole is the following type of pair
(a) completely constrained motion
(b) partially constrained motion
(c) incompletely constrained motion
(d) freely constrained motion
(e) none of the above.
Ans: a
43. A foot step bearing and rotor of a vertical turbine form examples of
(a) incompletely constrained motion
(b) partially constrained motion
(c) completely constrained motion
(d) successfully constrained motion
(e) none of the above.
Ans: b
44. A slider crank chain consists of following numbers of turning and sliding pairs
(a) I, 3
(b) 2, 2
(c) 3, 1
(d) 4, 0
(e) 0, 4
Ans: c
46. Relationship between the number of links (L) and number of pairs (P) is
(a) P = 2L-4
(b) P = 2L + 4
(c) P = 2L+2
(d) P = 2L-2
(e) P = L-4
Ans: c
49. In problem 47, the chain is unconstrained when
(a) L.H.S. = R.H.S.
(b) L.H.S. > R.H.S.
(c) L.H.S. < R.H.S.
(d) there is no such criterion for checking above requirement
(e) none of the above.
Ans: c
50. In problem 47, the chain is constrained when
(a) L.H.S. = R.H.S.
(b) L.H.S. < R.H.S. (c) L.H.S. > R.H.S.
(d) there is no such criterion for checking above requirement
(e) none of the above.
Ans: a