The design calculations for members subject to fluctuating loads with the same factor of safety yield the most conservative estimates when using
Correct Answer :- C
Explanation : The soderberg line is a more conservative failure criterion and there is no need to consider even yielding in this case.
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?
Correct Answer :- b
Explanation : The concept of equivalent torsional moment is used in the design of shafts on the basis of maximum shear stress theory of failure. The concept of equivalent bending moment is used in the design of shafts on the basis of maximum principal stress theory of failure
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will
Stress concentration in a machine component of ductile materials not so harmful as it is in brittle material because
A solid circular shaft is subjected to pure torsion. The ratio of maximum shear stress to maximum normal stress at any point would be
Match List-I (Failure theories) with List-II (Figures representing boundaries of these theories) and select the correct answer using the code given below the lists:
The maximum distortion energy theory of failure is suitable to predict the failure of which one of the following types of materials ?
Which one of the following figures represents the maximum shear stress theory of TRESCA criterion ?
Match List-I (Theory of Failure) with List-II (Predicted Ratio of Shear Stress to Direct Stress at yield Condition for Steel Specimen) select the correct answer using the code given below the lists:
Disruptive strength is the maximum strength of a metal, when
Who postulated the maximum distortion energy theory?
A rotating shaft carrying a unidirectional transverse load is subjected to :
In the design of connecting rod small end bearing, the value of permissible bearing pressure to be used is :
For bolts of uniform strength, the shank diameter is made equal to
A butt welded joint, subjected to tensile force P is shown in the given figure, l = length of the weld (in mm) h = throat of the butt weld (in mm) and H is the total height of weld including reinforcement. The average tensile stress st in
In the welded joint shown in the given figure if the weld at B has thicker fillets than at A then load carrying capacity P0 of the joint will
When a nut is tightened by placing a washer below it the bolt will be subjected to
The rivet head used for boiler plate riveting is usually
The piston rod and the crosshead in a steam engine are usually connected by means of
For longitudinal joint in boiler, the type of joint used is
For the bracket bolted as shown in the above figure, the bolts will develop
Match List-I (Applications) with List-II (Joints) and select the correct answer using the code given below the lists:
Match List-I (Type of joints) List-II (Mode of connecting member) and select the correct answer using the code given below the lists:
Match List-I with List-II and select the correct answer using the code given below the lists:
Which of the following property is affected by heat treatment?
Heat treatment involves changes in the micro structure and hence all the internal properties are effected.