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Theory of Machines and Machine Design

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Theory of Machines and Machine Design

shape Introduction

Theory of Machines and Machine Design is that branch of Engineering-Science, which deal with the study of relative motion between the various parts of a machine, and forces which act on them. i.e. Theory of Machines and Machine Design primarily study the dynamics of the machine components. The knowledge of this subject is very crucial for an engineer to design the various parts of a machine. Theory of Machines can be broadly classified in 4 sub-branches: Kinematics, Dynamics, Kinetics, Statics.
  • Kinematics: Kinematics deals with the relative motion between the various parts of the machines.

  • Dynamics: Dynamics deals with the forces and their effects, while acting upon the machine parts in motion.

  • Kinetics: Kinetics deals with the inertia forces which arise from the combined effect of the mass and motion of the machine parts.

  • Statics: Statics deals with the forces and their effects while the machine parts are at rest. The mass of the parts is assumed to be negligible.

  • shape Quiz

    Q1. A cam with a roller follower would constitute following type of pair
      A. lower pair B. higher pair C. open pair D. close pair Answer: B

    Q2. In most machine members, the damping capacity of the material should be
      A. low B. zero C. high D. could be anything E. None of the above Answer: C

    Q3. According to I.S. specification, 100 H6g5 means that
      A. tol eran ce gr ade for the hole is 6 and for th e shaft is 5 B. tol eran ce gr ade for the sh aft is 6 and for the hole is 5 C. tolerance grade for the shaft is 4 to 8 and for the h ole is 3 to 7 D. tolerance grade for the hole is 4 to 8 for the shaft is 3 to 7 Answer: A

    Q4. Gears are casted by
      A. sand mould casting B. slush casting C. permanent mould casting D. centrifugal casting Answer: C

    Q5. If the controlling force of a governor increases withincrease in speed, the governor is said to be
      A. sensitive B. insensitive C. isochronous D. powerful Answer: D

    Q6. Kinematic pairs are those which have
      A. point or line contact between the two elements when in motion B. surface contact between the two elements when in motion C. elements of pairs not held together mechanically D. two elements that permit relative motion Answer: D

    Q7. A porter governor could be classified as could be classified as
      A. inertia type governor B. pendulum type governor C. centrifugal type gover nor D. dead weight type gover nor Answer: D

    Q8. Lower pairs are those which have
      A. point or line contact between the two elements when in motion B. surface contact between the two elements when in motion C. elements of pairs not held together mechanically D. two elements that permit relative motion Answer:B

    Q9. Pulley in a belt drive acts as
      A. cylindrical pair B. turning pair C. rolling pair D. sliding pair Answer: C

    Q10. Taper on the cotter and slot is provided
      A. on both the sides B. on one side only C. on none of the sides D. may be provided anywhere Answer: B
    Q11. Rankine's theory of failure is applicable for following type of materials
      A. brittle B. ductile C. elastic D. plastic Answer: A

    Q12. A steel contain in g 0.8 5% carbon is known as
      A. eutectoid steel B. hyper-eutectoid steel C. hypo-eutectoid steel D. None of the above Answer: A

    Q13. Length of cross belt, in addition to centre length, depends
      A. only on the sum of the radii of pulleys B. on the sum and differnce of the radii of the pulleys C. square of difference of radii of the pulleys D. square of sum of radii of pulleys Answer: A

    Q14. The approximate straight line mechanism is a
      A. four bar linkage B. 6 bar linkage C. 8 bar linkage D. 3 bar linkage Answer: B

    Q15. The coriolis component of acceleration leads the sliding, velocity by
      A. 45° B. 90° C. 135° D. 180° Answer: B

    Q16. In composite or reverse laid ropes
      A. direction of twist of wires in strands is opposite to the direction of twist of strands B. derection of twist of wires and strands are same C. wires in two adjacent strands are twisted in opposite direction D. wires are not twisted Answer: C

    Q17. Which of the following is not correct procedure to increase the fatigue limit?
      A. Cold working B. Shot peening C. Surgace decarburisation D. Under-stressing Answer: 17

    Q18. Belt slip may occur due to
      A. heavy load B. loose belt C. driving pulley too small D. All of the above Answer: D

    Q19. The term "effort of governor" refers to
      A. centrifugal force of balls B. useful power developed C. force acting on sleeve for given % change of speed D. minimum force required on sleeve for % change of speed Answer: C

    Q20. Cam angle is defined as the angle
      A. during which the follower returns to its initial position B. of rotation of the cam for a definite displacement ofthe follower C. through which the cam rotates during the period in which the follower remains in the highest position moved by the cam from the instant the follower bigins D. to rise, till it reaches its highest position Answer: B
    Q21. When two springs are in series (having stiffness K), the equivalent stiffness will be
      A. K B. K/2 C. 2K D. K/4 Answer: B

    Q22. In the case of an elastic bar fixed at upper end loaded by a falling weight at lower end, the sh ock olad produced can be decreased by
      A. decreasing the cross-section area of bar B. increasing the cross-section area of bar C. remain unaffected with cross-section area D. would depend upon other factors Answer: A

    Q23. Length of open belt, in addition to centre length, depends
      A. only on the sum of the radii of pulleys B. on the sum and difference of the radii of the pulleys C. square of defference of radii of pulleys D. square of sum of radii of pulleys Answer: B

    Q24. Which one of the following is a criterion in the design of hydrodynamic journal bearings?
      A. Sommerfield number B. Rating life C. Specific dynamic capacity D. Rotation factor Answer: A

    Q25. Which of the following bearing is suitable for fluctuating demands?
      A. Needle roller bearing B. Ball bearing C. Tapered bearing D. Cylindrical bearing Answer: A

    Q26. Which of the following is a positive locking device?
      A. Castled nut B. Locking by pin C. Locking by threaded D. Split nut Answer: A

    Q27. Deep groove ball bearings are used for
      A. heavy thrust load only B. small angular displacement of shafts C. radial load at high speed D. combined thrust and radial loads at high speed Answer: D

    Q28. Which of the following key is under compression rather than in being shear when under load?
      A. Saddle B. Barth C. Feather D. Kennedy Answer: B

    Q29. Which of the following is maximum capacity bearing?
      A. Filling notch bearing B. Single row bearing C. Angular contact bearing D. Self-aligning bearing Answer: A

    Q30. A kinematic pair consists of which of the following :
      A. two elements that permit relative motion B. two elements that are connected to each other C. two elements that do not permit relative motion D. None of these Answer: A
    Q31. A link that connects double slider crank chain fraces the path of which of the following shape?
      A. an elliptical path B. a circular path C. a straight path D. a hyperbolic path Answer: A

    Q32. Universal joint is an example of which of the following type of pair :
      A. Higher pair B. Lower pair C. Rolling pair D. None of these Answer: B

    Q33. Which of the following pair, a ball and socket joint forms?
      A. Spherical pair B. Rolling pair C. Turning pair D. Sliding pair Answer: A

    Q34. The safe rim velocity of a flywheel is influenced by:
      A. Mass of the flywheel B. energy fluctuation C. centrifugal stresses D. speed fluctuation Answer: C

    Q35. Por ter g over n or is a :
      A. Pendulum type governor B. Dead weight type gover nor C. Spring loaded type gover nor D. Inertia type gover nor Answer: B

    Q36. In case of an isochronous governor, the value of sensitivity is
      A. infinity B. zero C. one D. None of these Answer: A

    Q37. Which one of the following governors cannot be isochronous?
      A. Hartnell B. Porter C. Watt D. Hartung Answer: B

    Q38. The size of the cam depends upon :
      A. Base circle B. Pitch circle C. Prime circle D. None of these Answer: A

    Q39. Cam used for low and moderate speed engines should move with:
      A. uniform velocity B. Harmonic motion C. uniform acceleration D. cycloidal motion Answer: B

    Q40. For a simple harmonic motion of a cam follower, a cosine curve shows :
      A. acceleration diagram B. displacement diagram C. velocity diagram D. All of the above Answer: A
    Q41. The outer cir cle of spur gear is called :
      A. pitch circle B. base circle C. addendum circle D. dedeundum circle Answer: B

    Q42. Creep in a belt occurs due to :
      A. uneven contraction and extension of the belt B. weak material of the pulley C. weak material of the belt D. improper crowning Answer: A

    Q43. If in case of disc clutch, [latex]N_{1}[/latex] = Number of discs on driving shaft [latex]N_{2}[/latex] = Number of discs on driving shaft then, n umber of pairs of contact surfaces wi ll be :
      A. [latex]N_{1}[/latex]-[latex]N_{2}[/latex]+1 B. [latex]N_{1}[/latex]-[latex]N_{2}[/latex]-1 C. [latex]N_{1}[/latex]+[latex]N_{2}[/latex]+1 D. [latex]N_{1}[/latex]+[latex]N_{2}[/latex]-1 Answer: D

    Q44. Which of the following clutches is positive type?
      A. jaw B. cone C. disc D. centrifugal Answer: A

    Q45. The included angle of V - belt is generally :
      A. 10° – 20° B. 20° – 30° C. 30°– 40° D. 40° – 50° Answer: C

    Q46. The diamond riveting is utilized for :
      A. structural work B. boiler work C. both structural and boiler work D. None of these Answer: A

    Q47. A rivet is specified by:
      A. shank diameter B. type of load C. len gth of rivet D. None of these Answer: A

    Q48. Which of the following type of material, the rivets are made?
      A. brittle B. ductile C. high density D. None of these Answer: B

    Q49. Lewis equation in case of gears is used to find the:
      A. Bending stress B. Tensile stress C. compressive stress D. All of these Answer: A

    Q50. Which type of teeth are normally used and satisfy law of gearing?
      A. conjugate teeth B. cycloidal teeth C. involute teeth D. All of these Answer: C