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Free download in PDF Machine Design Objective Type Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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
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
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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