1
GATE ME 1992
MCQ (Single Correct Answer)
+1
-0.3
Fatigue strength of a rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force because
A
axial stiffness is less than bending stiffness
B
of absence of centrifugal effects in the rod
C
the number of discontinuities vulnerable to fatigue are more in the rod
D
at a particular time the rod has only one type of stress whereas the beam has both the tensile and compressive stresses
2
GATE ME 1991
Fill in the Blanks
+1
-0
In a shaft with a transverse hole, as the hole to the shaft diameter ratio ___________ (increases / decreases), the torsional stress concentration factor__________ (increases/decreases)
3
GATE ME 1990
MCQ (Single Correct Answer)
+1
-0.3
The process of shot peening increases the fatigue life of steel springs mainly because it results in
A
surface hardening
B
increased stiffness of the material
C
structural changes in the material
D
residual compression at the surface
4
GATE ME 1989
MCQ (Single Correct Answer)
+1
-0.3
Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because
A
in ductile material local yielding may distribute stress concentration
B
ductile material has larger Young's materials.
C
Poisson's ratio is larger in ductile materials.
D
Modulus of rigidity is larger in ductile materials.
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Turbo Machinery
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