Machine Design Quiz | Machine Design Objective Type Questions with Answers

Questions
121 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

Answer: provide bearing area
122 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

Answer: buttress thread
123 Shear stress theory is applicable for
A ductile fnaterials
B brittle materials
C elastic materials
D all of the above

Answer: ductile fnaterials
124 Maximum principal stress theory is applicable for
A ductile materials
B brittle materials
C elastic materials
D all of the above

Answer: brittle materials
125 The crest diameter of a screw thread is same as
A major diameter
B minor diameter
C pitch diameter
D core diameter

Answer: major diameter
126 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

Answer: decreases markedly
127 Residual stress in materials
A acts when external load is applied
B becomes zero when external load is removed
C is independent of external loads
D is always harmful

Answer: is independent of external loads
128 Cold working
A increases the fatigue strength
B decreases the fatigue strength
C has no influence on fatigue strength
D alone has no influence on fatigue strength

Answer: increases the fatigue strength
129 The fatigue limit of a material
A is greatly decreased by poor surface conditions
B remains same irrespective of surface conditions
C depends mainly on core composition
D is dependent upon yield strength of material

Answer: is greatly decreased by poor surface conditions
130 In testing a material for endurance strength, it is subjected to
A static load
B dynamic load
C impact load
D completely reversed load.

Answer: completely reversed load.
131 Coaxing is the procedure of increasing
A metal strength by cycling
B metal hardness by surface treatment
C metal resistance to corrosion by coating
D fatigue limit by overstressing the metal by successively increasing loadings

Answer: fatigue limit by overstressing the metal by successively increasing loadings
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