# In the design of shafts made of the ductile materials subjected to twisting moment and bending moment, the recommended theory of failure is

1.  Maximum principal stress theory

2.  Maximum principal strain theory

3.  Maximum shear stress theory

4.  Maximum strain – energy theory

4
Correct Answer :

Maximum shear stress theory

Explanation :
No Explanation available for this question

# Strength to weight ratio for a circular shaft transmitting power is directly proportional to the

1.  Square root of the diameter

2.  Diameter

3.  Square of the diameter

4.  Cube of the diameter

4
Correct Answer :

Diameter

Explanation :
No Explanation available for this question

# Strength to weight ratio for a circular shaft transmitting power is directly proportional to the

1.  Square root of the diameter

2.  Diameter

3.  Square of the diameter

4.  Cube of the diameter

4
Correct Answer :

Diameter

Explanation :
No Explanation available for this question

# In the design of shafts made of the ductile materials subjected to twisting moment and bending moment, the recommended theory of failure is

1.  Maximum principal stress theory

2.  Maximum principal strain theory

3.  Maximum shear stress theory

4.  Maximum strain – energy theory

4
Correct Answer :

Maximum shear stress theory

Explanation :
No Explanation available for this question

# The homogeneous state of stress for a metal part undergoing plastic deformation is Where the stress component values are in MPa. Using von Mises yield criterion, the value of estimated shear yield stress, in MPa is

1.   9.50

2.  16.07

3.   28.52

4.  49.41

4
Correct Answer :

16.07

Explanation :
No Explanation available for this question

# A solid circular shaft needs to be designed to transmit a torque of 50N.m. If the allowable shear stress of the material is 140 MPa, assuming a factor of safety of 2, the minimum allowable design diameter in mm is

1.  8

2.  16

3.   24

4.  32

4
Correct Answer :

16

Explanation :
No Explanation available for this question

# Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because

1.  In ductile material local yielding may distribute stress concentration

2.  Ductile material has larger Young’s materials

3.  Poisson’s ratio is larger in ductile materials

4.   Modulus of rigidity is larger in ductile materials.

4
Correct Answer :

In ductile material local yielding may distribute stress concentration

Explanation :
No Explanation available for this question

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

1.  Surface hardening

2.  Increasing stiffness of the material

3.  Structural changes in the material

4.  Residual compression at the surface

4
Correct Answer :

Residual compression at the surface

Explanation :
No Explanation available for this question

# Fatigue strength of rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force because

1.   Axial stiffness is less than bending stiffness

2.  Of absence of centrifugal effects in the rod

3.  The number of discontinuities vulnerable to fatigue are more in the rod

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

4
Correct Answer :

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

Explanation :
No Explanation available for this question

# A ductile material having an endurance limit of 196 N/mm2 and the yield point at 294 N/mm2 is stressed under variable load. The maximum and minimum stresses are 147 N/mm2 and 49 N/mm2. The fatigue stress concentration factor is 1.32. The available factor of safety for this loading is

1.  3.0

2.  1.5

3.  1.33

4.  4.0

4
Correct Answer :

1.5

Explanation :
No Explanation available for this question

## Interview Questions

 MongoDB Java Script Node JS PHP JQuery Python