Test: Fluctuating Load Consideration For Design & Miscellaneous - 1 - Mechanical Engineering MCQ

The S-N curve for steel becomes asymptotic nearly at     

A loaded semi-infinite flat plate is having an elliptical hole (A/B = 2) in the middle as shown in the figure. The stress concentration factor at points either X or Y is            

Consider the following statements:                

1. Endurance strength of a component is not affected by its surface finish and notch sensitivity of the material.

2. For ferrous materials like steel, S-N curve becomes asymptotic at 106 cycles.

Which of the statements given above is/are correct?  

When σ and Young's Modulus of Elasticity E remain constant, the energy absorbing capacity of part subject to dynamic forces, is a function of its 

Assertion (A): Soderberg relation is used for design against fatigue.      

Reason (R): Soderberg relation is based on yield strength of the material whereas all other failure relations for dynamic loading are based on ultimate strength of the material. 

In the figure shown, it the line AB represents Goodman criterion of failure, then soderberg criterion could be represented by line                  

Assertion (A): The precession of the axis of rotation of a shaft causes a gyroscopic reaction couple to act on the frame to which the bearings are fixed.

Reason (R): The reaction of the shaft on each bearing is equal and opposite to the action of the bearing on the shaft.        

A bicycle remains stable in running through a bend because of   

Assertion (A): Endurance limits for all materials are always less than the ultimate strength of the corresponding materials.

Reason (R): Stress concentration in a machine part due to any dislocation is very damaging when the part is subjected to variable loading.

Match List I with List II and select the correct answer:   

A band brake having band-width of 80 mm, drum diameter of 250 mm, coefficient of friction of 0.25 and angle of wrap of 270 degrees is required to exert a friction torque of 1000 N m. The maximum tension (in kN) developed in the band is   

In a band brake the ratio of tight side band tension to the tension on theslack side is 3. If the angle of overlap of band on the drum is 180° the coefficient of friction required between drum and the band is

What is the correct sequence of the following steps in engine analysis?

1. Vibration analysis  

2. Inertia force analysis.  

3.Balancing analysis    

4. Velocity and Acceleration analysis.

Select the correct answer using the codes given below: 

Consider the following design considerations:  

1. Tensile failure

2. Creep failure

3. Bearing failure

4.Shearing failure

5. Bending failure

The design of the pin of a rocker arm of an I.C. engine is based on 

Interchangeability can be achieved by 

Which of the following stresses are associated with the tightening of a nut on a stud?

1. Tensile stresses due to stretching of stud.  

2. Bending stresses of stud.              

3. Transverse shear stresses across threads.  

4. Torsional shear stresses in threads due to frictional resistance.

Select the correct answer using the codes given below:   

Consider the following statements regarding power:

1. It is the capacity of a machine.              

2. The efficiency is always less than unity as every device operates with some loss of energy.

3. A dynamometer can measure the power by absorbing it.

4. Watt-hour is the unit of power.

Of these statements: