Hiried Machine Design interview Questions and Answers pdf

61.    A self locking screw has
(a)    fine threads
(b)    coarse threads
(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
(c)    diameter of head
(d)    nominal diameter
(e)    all of the above.
 Ans: d

65.    The edges of a boiler plate are beveled 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 fibre 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 splitted and bent in reverse direction at other end
(e)    none of the above.
Ans: a

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