# Machine Design MCQ Objective Question and Answers Part 2

Machine Design Multiple choice Objective Question useful for technical Aptitude test.

Machine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4

40. 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.
Ans: c

41. The ratio of endurance limit in shear to the endurance limit in flexure is
(a) 0.33
(b) 0.4
(c) 0.5
(d) 0.55
(e) 0.6
Ans: d

42. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
(a) same
(b) 1/2
(c) 1/3
(d) 1/4
(e) 2/3
Ans: e

43. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of
(a) 0.25
(b) 0.45
(r) 0.55
(d) 0.65
(e)0.75.
Ans: e

44. At low temperatures (say 75°C) the notched-bar impact value of steel
(a) increases markedly
(b) decreases markedly
(c) remains same
(d) depends on heat treatment carried out
(e) none of the above.
Ans: b

45. A bolt
(a) has a head on one end and a nut fitted to the other
(b) has head at one end and other end fits into a tapped hole in the other part to be joined
(c) has both the ends threaded
(d) is provided with pointed threads
(e) requires no nut.
Ans: a

46. The crest diameter of a screw thread is same as
(a) major diameter
(b) minor diameter
(c) pitch diameter
(d) core diameter
(e) none of the above.
Ans: a

47. If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be
(a) lOVZ
(b) 10VZtol5Vd
(c) 15Vdto20VZ
(d) 20Vdto30Vd
(e) 30V5″to40Vd.
Ans: d

48. Maximum principal stress theory is applicable for
(a) ductile materials
(b) brittle materials
(c) elastic materials
(d) all of the above
(e) none of the above.
Ans: b

49. The following type of nut is used with alien bolt
(a) alien nut
(b) hexagonal nut
(c) slotted nut
(d) castle nut
(e) any one of the above.
Ans: e

50. A stud
(a) has a head on one end and a nut fitted to the other
(b) has head at one end and other end fits into a tapped hole in the other part to be joined
(c) has both the ends threaded
(e) requires locking nuts.
Ans: c

51. Shear stress theory is applicable for
(a) ductile fnaterials
(b) brittle materials
(c) elastic materials
(d) all of the above
(e) none of the above.
Ans: a

52. A tap bolt
(a) has a head on one end and a nut fitted to the other
(b) has head at one end and other end fits into a tapped hole in the other part \o be joined
(c) has both the ends threaded
(e) requires locking devices.
Ans: b

53. For applications involving high stresses in one direction only the following type of thread would be best suited
Ans: d

54. The included angle in unified of American National threads is
(a) 60°
(b) 55°
(c) 47°
(d) 29°
(e) none of the above.
Ans: a

55. The function of a washer is to
(a) provide cushioning effect
(b) provide bearing area
(c) absorb shocks and vibrations
(d) provide smooth surface in place of rough surface
(e) act as a locking device.
Ans: b

56. Cap screws are
(a) similar to’small size tap bolts except that a greater variety of shapes of heads are available
(b) slotted for a screw driver and generally used with a nut
(c) used to prevent relative motion be-tween parts
(d) provided with detachable caps
(e) similar to stud.
Ans: a

57. An alien bolt is
(a) self locking bolt
(b) same as stud
(c) provided with hexagonal depression in head
(d) used in high speed components
Ans: c

58. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be
(a) 28
(b) 8/2
(c) 48
(d) 8/4
(e) none of the above.
Ans: c

59. Ball bearing type screws are found in following application
(a) screw jack
(b) aeroplane engines
(c) crane
(d) steering mechanism
(e) bench vice.
Ans: d

60. Set screws are
(a) similar to small size tap bolts except that a greater variety of shapes of heads are available
(b) slotted for a screw driver and generally used with a nut
(c) used to prevent relative motion be-tween parts
(d) similar to stud
(e) none of the above.
Ans: c

61. A self locking screw has
(c) coefficient of friction > tangent of load angle
(d) hole for inserting split pin
(e) two nuts for locking.
Ans: c

62. The designation M 33 x 2 of a bolt means
(a) metric threads of 33 nos in 2 cm.
(b) metric threads with cross-section of 33 mm
(c) metric threads of 33 mm outside diameter and 2 mm pitch
(d) bolt of 33 mm nominal diameter having 2 threads per cm
(e) none of the above.
Ans: c

63. Machine screws are
(a) similar to small size tap bolts except that a greater variety of shapes of heads are available
(b) slotted for a screw driver and generally used with a nut
(c) used to prevent relative motion be-tween two parts
(d) similar to stud
(e) none of the above.
Ans: b

64. Rivets are generally specified by
(a) thickness of plates to be riveted
(b) length of rivet
(d) nominal diameter
(e) all of the above.
Ans: d

65. The edges of a boiler plate are bevelled to an angle of
(a) 30°
(b) 45°
(c) 60°
(d) 80°
(e) 85°.
Ans: d

66. Which of the following is a permanent fastening ?
(a) bolts
(b) keys
(c) cotters
(d) rivets
(e) screws.
Ans: d

67. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
(a) d
(b) 1.25 d
(c) 1.5 d
(d) 1.75 d
(e) 2 d.
Ans: c

68. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to
(a) 0.2
(b) 0.25
(c) 0.50
(d) 0.6
(e) 0.75.
Ans: b

69. Transverse fillet welded joints are designed for
(a) tensile strength
(b) compressive strength
(c) shear strength
(d) bending strength
(e) torsional strength.
Ans: a

70. Jam nut is a locking device in which
(a) one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
(b) a slot is cut partly in middle of nut and then slot reduced by tightening a screw
(c) a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
(d) through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
(e) none of the above.
Ans: a

71. The pitch of threads on a Jock nut in comparison to pitch of nut is
(a) same
(b) coarser
(c) finer
(d) very coarse
(e) very fine.
Ans: a

Machine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4

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Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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