Most recently Machine Design Objective type choice Questions with Answers pdf

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
(d)    has pointed threads
(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
(a)    ISO metric thread
(b)    acme thread
(c)    square thread
(d)    buttress thread
(e)    British Association thread.
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
(e)    provided with countersunk head.
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

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