Dear Readers, Welcome to Machine Design VIVA Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Machine Design VIVA Interview Questions. These Machine Design VIVA Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.
1. To innovate and to create.
2. Iterative decision making process to conceive and implement optimum systems to solve problems and needs of society.
3. A process of achieving a plan for the construction of a machine.
4. A purely mathematical design based upon principles of mechanics of materials and machines.
5. A design based upon standard practice and past experience.
6. A design evolved considering aesthetics, ergonomics and production aspects of design.
7. A design which is best and economical for the given objective function under the specified constraints.
8. The methodology of design by which ideas about needs are projected creatively into ideas about things, and which in turn are translated into engineering prescription for transforming suitable resources into useful, physical objects.
9. Science concerning generation of ideas, their collection (gathering), analysis and presentation.
10. A method to produce a conference technique by which a group attempts to find a solution for a specific problem by amassing all the ideas spontaneously contributed by its members.
11. Repeated attempts to accomplish the aims.
12. Facts, data, unorganised knowledge or intelligence.
13. To establish an overall concept for the project which will serve as a guide for the detailed design.
14. Describing the design process involving a detailed examination of the designer’s action as he goes about identifying and solving the problem.
15. Representation of the real world on desk in symbolic form or in the laboratory.
16. Design activity involved in modification by making relatively small changes to produce machines/products which already exist.
17. Combining several best alternatives together to ensure that desired end result is achieved.
18 ______refers to the flash of insight, the instantaneous production of something new and important.
19. Searching the solution for similar problems which exist in other areas whose solution might give hints.
20. A method for collective problem solving which attempts to apply much more control on an idea generation process.
21. A general basis for standardising and grading a series of similar dimensions, characteristics, etc.
22. The plastic deformation which persists after the removal of the applied load.
23. The stress at which the non-proportional elongation amounts to a specified percentage of the original gauge length.
24. Strain energy stored per unit volume.
25. Load per unit deflection.
26. The maximum strain energy which can be stored in a material per unit volume.
27. The ratio of the elastic limit to the ultimate strength.
28. The maximum stress below which a material can withstand an infinite number of cyclers of stress.
29. The ratio of the fatigue limit to the tensile strength.
30. The process of improving fatigue properties by operation at stresses under the endurance limit.
31. The process of improvement in the fatigue properties obtained by understressing and then raising the stress in small increments.
32. The slow and progressive deformation of a material with time under a constant stress.
33. Sealing devices which establish a direct contact between the sealing comnponent and the rotating shaft.
34. There is no mechanical contact with rotating shaft in ______ seals and thus no rubbing contact exists.
35. These seals create a pressure drop of the fluid to be sealed with the least possible flow and simultaneously permit unrestricted relative motion between moving parts.
36. A pressure vessel is defined as thin or thick depending on ratio of plate thickness to the mean radius of pressure vessel being less than or more than
37. An operation performed in a round nosed chisel by pressing at the ends of bevelled plates to obtain leakproof joints.
38. Type of rivets used for joint which is accessible from only one side.
39. According to ______ formula, the diameter of rivet = 6 Root(thickness of plate).
40. A key inserted into the keyway which is partly in the shaft and partly in the hub.
41. A key consisting of two keys driven at 90° or 120° apart and fitted diagonally and used for heavy duty power transmission in either direction.
42. A rectangular key with the two ends bevelled off at 45° to facilitate assembly and disassembly.
43. Snap rings used to prevent axial motion of two concentric parts.
44. A joint used to connect two rods subjected to tensile loads only.
45. Cylindrical members threaded at both ends.
46. A special form of fluid film lubrication in which the development of effective films is encouraged by local elastic deformation of bearing solids.
47. A plate or cylinder which communicates motion to a follower by means of its edge or a groove cut in its surface.
48. Combinations of gears in which some or all of the gears have a motion compounded of rotation about an axis and a translation or revolution of that axis.
49. Threads for general use, especially where rapid assembly is required and for gray iron, soft metals and plastics.
50. Threads for applications requiring greater strength or where the length of engagement is limited.
51. Threads for highly stressed parts and where internal threads are required in thin walled fasteners.
52. Largest diameter of a screw thread.
53. Smallest diameter of a screw thread.
54. Used for fastening collars, sheaves, gears etc. to shafts to prevent relative rotation or translation.
55 _______ keys prevent parts from turning on a shaft while allowing them to move in a lengthwise direction.
56. It’makes a semipermanent connection between two shafts.
57. Couplings having two basic parts, an impeller and runner, there being no mechanical connection between the two shafts.
58. Couplings which permit the disengagement of the coupled shafts during rotation.
59. Brakes used with flywheels for quick braking and where large kinetic energy of the rotating masses precludes the use of block brakes due to excessive heating.
60. Drives with efficiency of 98 to 99% having no slippage, no initial tension, and possibility of travelling in either direction.
61. Built up of strands of wires laid together.
62. Wing ropes in which the wires and strands are laid in the same direction.
63. A rope made of 6 strands, each of 19 wires, the^strands being laid around a fibre core.
64. Rope constructed of 6 strands of 7 wires each, lang-lay, laid around a fibre core, and covered with an outer layer composed of 12 strands, 7 wires, regularlay.
65. Tooth form of gears for intersecting shafts.
66. The ratio of number of teeth in the gear to the diameter of the pitch circle.
67. The distance along the line of action between successive involute tooth surfaces.
68. The acute angle between the common normal to the profile at the contact point and the common pitch plane.
69. The circle from which the involute tooth profiles are generated.
70. Bevel gears for right angled shafts and gears having 1 : 1 ratio.
71. Bearings to prevent lengthwise motion of a rotating shaft.
72. Means used to prevent or minimise leakage of a fluid through mechanical clearance in either the static or dynamic state.
73. Unique flange packings having an elastometer lip generally bounded to a metal cup which is press-fitted into a smooth cylindrical bore.
74. Under dynamic stresses, the ______ limit of the material should be taken as the criterion for the design of the shaft.
75. For a shaft having distance T between supports, the critical speed is proportional to ______.
76. Type of spring suited for space limitations and for providing variable stiffness.
77. Type of spring for high compression capacity and to fit into small space.
2. engineering design
3. machine design
4. rational design
5. empirical design
6. industrial design
7. optimum design
8. morphology of design
13. preliminary design
14. anatomy of design
16. design by evolution
21. preferred numbers
22. permanent set
27. elastic ratio
28. endurance limit
29. endurance ratio
33. interfacial seals
35. interstitial seals
38. blind rivets
40. sunk key
41. Kennedy key
46. elasto-hydrodynamic lubrication
48. epicyclic gear trains
49. coarse-series threads
50. fine-thread series
51. extra-fine threads
52. major diameter
53. minor diameter
54. set screws
57. fluid couplings
59. eddy current brakes
60. roller-chain drive
61. wire rope
62. lang lay rope
63. standard hoisting rope
64. non spinning hoisting rope
66. diametral pitch
67. base pitch
68. pressure angle
69. base circle
70. mitre gears
71. thrust bearings
73. oil seal
75. (l)Powerof -3/2)
76. conical helical spring
77. Belleville spring