Questions on Machine Design Multiple choice Questions and Answers pdf

81.    If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

(a) 102 d 
(b) 124 d
(c) 138 d 
(d) 151 d
(e) 168 d.
Ans: e

82.    If threads on a bolt are left hand, threads on nut will be
(a)     right hand with same pitch
(b)     left hand with same pitch
(c)    could be left or right hand
(d)    right hand with fine pitch
(e)    left hand with fine pitch.
Ans: b

83.    Taper usually provided on cotter is
(a) 1 in 5 
(b) 1 in 10
(c) 1 in 24 
(d) 1 in 40
(e) 1 in 50.
Ans: c

84.    Applications in which stresses are encountered in one direction only uses following type of threads
(a) metric 
(b) buttress
(c) acme 
(d) square
(e) BSW.
Ans: b

85.    The draw of cotter need not exceed
(a) 3 mm 
(b) 5 mm
(c) 10 mm 
(d) 20 mm
(e) 25 mm.
Ans: a

86.    A bench vice has following type of threads
(a) metric 
(b) square
(c) buttress 
(d) acme
(e) BSW.
Ans: d

87.    The valve rod in a steam engine is connected to an eccentric rod by
(a)    cotter joint
(b)    bolted joint
(c)    kunckle joint
(d)    universal coupling
(e)    gib and cotter joint.
Ans: c

88.    Split 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 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 pin splitted and bent in reverse direction at the other end
(e)    none of the above.
Ans: b

89.    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
(e)    none of the above.
Ans: b

90.    The function of cutting oil when threading a pipe is to
(a)    provide cooling action
(b)    lubricate the dies
(c)    help remove chips
(d)    all of the above
(e)    none of the above.
Ans: d

Read More Questions:
Machine Design - Mechanical Engineering MCQs Part1
Machine Design - Mechanical Engineering MCQs Part2
Machine Design - Mechanical Engineering MCQs Part3
Machine Design - Mechanical Engineering MCQs Part4
Machine Design - Mechanical Engineering MCQs Part5
Machine Design - Mechanical Engineering MCQs Part6
Machine Design - Mechanical Engineering MCQs Part7
Machine Design - Mechanical Engineering MCQs Part8
Machine Design - Mechanical Engineering MCQs Part9
Machine Design - Mechanical Engineering MCQs Part10
Machine Design - Mechanical Engineering MCQs Part11
Machine Design - Mechanical Engineering MCQs Part12
Machine Design - Mechanical Engineering MCQs Part13

Machine Design Objective type Questions and answers

11.    .Other method of reducing shock load in the above case can be
(a)    to decrease length
(b)    to increase length
(c)    unaffected by length
(d)    other factors would decide same
(e)    none of the above.
Ans: b


12.    If a load W is applied instantaneously on a bar; then the stress induced in bar will
(a)    be independent of ratio of mass of load W to mass of bar (y)
(b)    increase with increase in y
(c)    decrease with decrease in y
(d)    depend on other considerations
(e)    none of the above.
Ans: a

13.    Brittle coating technique is used for
(a)    determining brittleness
(b)    protecting metal against corrosion
(c)    protecting metal against wear and tear
(d)    experimental stress analysis
(e)     non-destructive testing of metals.
Ans: d

14.    Stress concentration is caused due to
(a)     variation in properties of material from point to point in a member
(b)     pitting at points or areas at which loads on a member are applied
(c)    abrupt change of section
(d)    all of the above
(e)    none of the above.
Ans: d

15.    The endurance limit of a material with finished surface in comparison to rough surface is
(a)    more
(b)    less
(c)    same
(d)    more or less depending on quantum of load
(e)    unpredictable.
Ans: a

16.    Plastic flow in ductile materials
(a)    increases the seriousness of static loading stress concentration
(b)    lessens the seriousness of static loading stress concentration
(c)    has no effect on it
(d)    depends on other considerations
(e)    none of the above.
Ans: b

17.    The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
(a)    same in both cases
(b)    2 times more
(c)    3 times more
(d)    4 times more
(e)    unpredictable.
Ans: c

18.    The fatigue life of a part can be improved by
(a) electroplating
(b) polishing
(c) coating 
(d) shot peening
(e) heat treating.
Ans: d

19.    Stress concentration in static loading is more serious in
(a)    ductile materials
(b)    brittle materials
(c)    equally serious in both cases
(d)    depends on other factors
(e)    unpredictable.
Ans: b

20.    Stress concentration in cyclic loading is more serious in
(a)    ductile materials
(b)    brittle materials
(c)    equally serious in both cases
(d)    depends on other factors
(e)    unpredictable.
Ans: a

Read More Questions:
Machine Design - Mechanical Engineering MCQs Part1
Machine Design - Mechanical Engineering MCQs Part2
Machine Design - Mechanical Engineering MCQs Part3
Machine Design - Mechanical Engineering MCQs Part4
Machine Design - Mechanical Engineering MCQs Part5
Machine Design - Mechanical Engineering MCQs Part6
Machine Design - Mechanical Engineering MCQs Part7
Machine Design - Mechanical Engineering MCQs Part8
Machine Design - Mechanical Engineering MCQs Part9
Machine Design - Mechanical Engineering MCQs Part10
Machine Design - Mechanical Engineering MCQs Part11
Machine Design - Mechanical Engineering MCQs Part12
Machine Design - Mechanical Engineering MCQs Part13