GATE ME 1993 | Fatigue Strength Question 18 | Machine Design

GATE ME 1993

MCQ (Single Correct Answer)

-0.3

The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?

$$-T$$ to $$+T$$

$$-T/2$$ to $$+T$$

$$0$$ to $$+T$$

$$+T/2$$ to $$+T$$

GATE ME 1992

MCQ (Single Correct Answer)

-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

axial stiffness is less than bending stiffness

of absence of centrifugal effects in the rod

the number of discontinuities vulnerable to fatigue are more in the rod

at a particular time the rod has only one type of stress whereas the beam has both the tensile and compressive stresses

GATE ME 1991

Fill in the Blanks

-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)

GATE ME 1990

MCQ (Single Correct Answer)

-0.3

The process of shot peening increases the fatigue life of steel springs mainly because it results in

surface hardening

increased stiffness of the material

structural changes in the material

residual compression at the surface

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