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theory of machines MCQs

Practise focused theory of machines questions with marked answers for exam preparation and subject revision.

theory of machines Mcqs

1. Typewriter constitutes__________________?
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A. machine

B. none of the above

C. mechanism

D. inversion

E. structure

2. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________?
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A. maximum and minimum

B. maximum and zero

C. minimum and maximum

D. zero and minimum

E. zero and maximum

3. The Scott-Russell mechanism consists of_________________?
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A. sliding and rotary pairs

B. turning and rotary pairs

C. sliding pairs only

D. sliding and turning pairs

E. turning pairs only

4. Angle of ascent of cam is defined as the angle___________________?
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A. of rotation of the cam for a definite displacement of the follower

B. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

C. moved by the cam from beginning oi ascent to the termination of descent

D. through which the cam rotates during the period in which the follower remains in highest position

E. during which the follower returns to its initial position

5. A kinematic chain requires at least________________________?
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A. 4 links and 4 turning pairs

B. none of the above

C. 3 links and 4 turning pairs

D. 2 links and 3 turning pairs

E. 5 links and 4 turning pairs

6. The example of lower pair is_______________?
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A. none of the above

B. shaft revolving in a bearing

C. all of the above

D. straight line motion mechanisms

E. automobile steering gear

7. The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line________________?
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A. joining the corresponding points

B. perpendicular to line as per A.

C. at 45 to line as per A.

D. none of the above

E. not possible to determine with these data

8. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts_______________?
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A. kinetics

B. mechanisms

C. kinematics

D. theory of machines

E. applied mechanics

9. Which is the false statement about the properties of instantaneous center____________________?
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A. the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

B. the two rigid links have no linear velocities relative to each other at the instantaneous centre

C. at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

D. the double centre can be denoted either by 02 or Ol2, but proper selection should be made

E. none of the above

10. Peaucellier mechanism has__________________?
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A. five links

B. four links

C. eight links

D. six links

E. twelve links

11. T Jie horse power transmitted by a belt is dependent upon _________________?
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A. tension on slack side of belt

B. all of the above

C. tension on tight side of belt

D. speed of pulley

E. radius of pulley

12. Which of the following would constitute a link__________________?
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A. piston, crank pin and crank shaft

B. piston, and piston rod

C. piston rod and cross head

D. piston, piston rings and gudgeon pin

E. piston, piston-rod and cross head

13. The e.g. of a link in any mechanism would experience_________________?
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A. no acceleration

B. linear acceleration

C. angular acceleration

D. both angular and linear accelerations

E. none of the above

14. Which of the following is false statement in respect of differences between machine and structure___________________?
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A. Machines transmit mechanical work, whereas structures transmit forces

B. Efficiency of machines as well as structures is below 100%

C. In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures

D. Machines modify movement and work, whereas structures modify forces

E. Machines are run by electric motors, but structures are not

15. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is______________________?
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A. Oldhams coupling

B. chain coupling

C. flexible coupling

D. universal coupling

E. American coupling

16. Ackermann steering gear consists of_______________?
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A. lower pairs

B. higher pairs

C. sliding pairs

D. rolling pairs

E. turning pairs

17. the chain is constrained when_________________?
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A. L.H.S. = R.H.S.

B. none of the above

C. L.H.S. R.H.S.

D. there is no such criterion for checking above requirement

18. In elliptical trammels_________________?
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A. one pair turning and three pairs sliding

B. two pairs turning and two pairs sliding

C. three pairs turning and one pair sliding

D. all four pairs sliding

E. all four pairs are turning

19. The number of links in pantograph mechanism is equal to______________?
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A. 5

B. 4

C. 6

D. 3

E. 2

20. To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use__________________?
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A. bevel gear

B. spiral gear

C. worm gear

D. crown gear

E. spur gear

21. The magnitude of tangential acceleration is equal to____________________?
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A. velocity x crank radius2

B. velocity2 x crank radius

C. velocityvcrankradius

D. none of the above

E. (velocity/crankradius)

22. Angular acceleration of a link can be determined by dividing the___________________?
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A. centripetal component of acceleration with length of link

B. all of the above

C. tangential component of acceleration with length of link

D. resultant acceleration with length of link

E. none of the above

23. A completely constrained motion can be transmitted with __________________?
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A. 1 link with pin joints

B. all of the above

C. 2 links with pin joints

D. 4 links with pin joints

E. 3 links with pin joints

24. The Hookes joint consists of ____________________?
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A. five forks

B. one fork

C. four forks

D. three forks

E. two forks

25. Relationship between the number of links (L) and number of pairs (P) is___________________?
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A. P = L-4

B. P = 2L-4

C. P = 2L+2

D. P = 2L-2

E. P = 2L + 4

26. A panto graph is a mechanism with___________________?
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A. rolling pairs

B. turning pairs

C. spherical pairs

D. higher pairs

E. lower pairs

27. The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be________________?
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A. 0, and more than co2r

B. cor, 0

C. none of the above

D. 0, 0

E. 0, and less than coV

28. Pulley in a belt drive acts as_______________?
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A. rolling pair

B. sliding pair

C. surface pair

D. cylindrical pair

E. turning pair

29. The Ackermann steering mechanism is preferred to the Davis type in automobiles because____________________?
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A. the former is most rigid

B. the former is most economical

C. the former is having turning pair

D. the former is mathematically accurate

E. none of thfr above

30. Which of the following is a lower pair_______________?
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A. cam and follower

B. A. and B. above

C. ball and socket i

D. belt drive

E. piston and cylinder

31. A universal joint is an example of_____________________?
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A. higher pair

B. sliding pair

C. lower pair

D. rolling pair

E. turning pair

32. The locus of a point on a thread unwound from a cylinder will be___________________?
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A. involute

B. cycloidal

C. helix

D. a straight line

E. a circle

33. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts___________________?
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A. kinematics

B. applied mechanics

C. theory of machines

D. kinetics

E. mechanisms

34. In an ideal machine, the output as compared to input is_______________?
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A. more

B. less

C. always less

D. equal

E. may be less or more depending on efficiency

35. Coriolis component acts________________?
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A. perpendicular to sliding surfaces

B. along sliding surfaces

C. unpredictable

D. none of the above

E. somewhere in between above two

36. Any point on a link connecting double slider crank chain will trace a ________________?
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A. ellipse

B. parabola

C. hyperbola

D. straight line

E. circle

37. In multi-V-belt transmission, if one of the belt is broken, we have to change the_________________?
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A. broken belt

B. all the weak belts

C. there is no need of changing any one as remaining belts can take care of transmission of load

D. broken belt and its adjacent belts

E. all the belts

38. If two moving elements have surface contact in motion, such pair is known as_________________?
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A. higher pair

B. lower pair

C. rolling pair

D. surface pair

E. sliding pair

39. A circular bar moving in a round hole is an example of_______________?
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A. partially constrained motion

B. incompletely constrained motion

C. completely constrained motion

D. none of the above

E. successfully constrained motion

40. With single Hookes joint it is possible to connect two shafts, the axes of which have an angular misalignment up to ________________?
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A. 40

B. 60.

C. 30

D. 10

E. 20

41. In a rigid link OA, velocity of A w.r.t. will be___________________?
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A. at 45 to OA

B. along OA

C. along AO

D. perpendicular to OA

E. parallel to OA

42. Coriolis component is encountered in_________________?
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A. slider crank mechanism

B. all of the above.

C. four bar chain mechanism

D. quick return mechanism of shaper

E. A. and C. above

43. The Kleins method of construction for reciprocating engine mechanism _______________?
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A. is based on acceleration diagram

B. utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. enables determination of Coriolis component

D. is a simplified form of instantaneous center method

E. none of the above

44. The example of higher pair is_________________?
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A. belt, rope and chain drives

B. all of the above

C. none of the above

D. gears, cams

E. ball and roller bearings

45. If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________?
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A. D1+D2

B. D1

C. D1-D2.

D. D1/D2

E. D2/D1

46. Which of the following has sliding motion________________?
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A. cross head guide

B. crank

C. connecting rod

D. cross-head

E. crank pin

47. Pitch point on a cam is_________________?
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A. none of the above

B. the point on cam pitch curve having the minimum pressure angle

C. the point on cam pitch curve having the maximum pressure angle

D. any point on pitch curve

E. any point on pitch circle

48. Kleins construction can be used when_________________?
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A. crank has uniform angular acceleration

B. crank has a uniform angular velocity

C. crank has non-uniform velocity

D. crank has uniform angular velocity and angular acceleration

E. there is no such criterion

49. A slider crank chain consists of following numbers of turning and sliding pairs_________________?
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A. 0, 4

B. I, 3

C. 2, 2

D. 3, 1

E. 4, 0

50. Kinematic pairs are those which have__________________?
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A. two elements that permit relative mo-tion

B. elements of pairs not held together mechanically

C. none of the above

D. surface contact between the two ele-ments when in motion

E. point or line contact between the two elements when in motion

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