SOM Mock Test -II

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SOM Mock Test -II

This Test series useful for who are preparing for various technical examinations particularly TRB Mechanical, TNEB AE, TNPSC AE, SSC JE, NLC GET, ISRO, PSU's and State PSC and Entrance Exams Like TANCET Etc.,

The temperature stress is a function of 1. Co-efficient of linear expansion.2. Temperature rise.3. Modulus of elasticity

1 point

1, 2 and 3

1 and 3 only

2 and 3 only

1 and 2 only

Clear selection

A beam of uniform strength is one which has same

1 point

Bending stress at every section

Bending moment throughout the beam

Shear force throughout the beam

Deflection throughout the beam

Clear selection

A closed coil helical spring absorbs 40 N-mm energy while extending by 4 mm, the stiffness of the spring is

1 point

5 N/mm

6 N/mm

10 N/mm

8 N/mm

Clear selection

The point of zero bending moment, where the continuous curve of bending moment changes sign, is called

1 point

The point of contra-flexure

The point of inflation

The point of virtual hinge

All of the above

Clear selection

A torque T is applied at the free end of a stepped rod of circular cross-section as shown in the figure. The shear modulus of material of the rod is G. The expression for d to produce an angular twist q at the free end is

2 points

Option 3

Option 4

Option 2

Option 1

Clear selection

A beam of span 3 m and width 90 mm is loaded as shown in figure. If the allowable bending stress is 12 MPa, the minimum depth required for the beam will be

2 points

346 mm

318 mm

246 mm

218 mm

Clear selection

Match the Column –I with Column – II and select the correct answer:

2 points

A-3;B-2;C-4;D-1

A-5;B-1;C-3;D-2

A-3;B-1;C-4;D-2

A-5;B-2;C-3;D-1

Clear selection

Euler’s formula gives 5 to 10% error in crippling load as compared to experimental results in practice because

1 point

The assumptions made in using the formula are not met in practice.

Effect of direct stress is neglected

Pin Joints are not free from friction

The material does not behave in an ideal elastic way in tension and compression.

Clear selection

On the case of beams with circular cross section, what is the ratio of the maximum shear stress to average shear stress?

1 point

3:1

3:2

2:1

4:3

Clear selection

A cantilever beam of length ‘l’ length at the tip with force F, the root bending moment is

1 point

Fl^2

2Fl

½ Fl

Clear selection

If the area of cross-section of a wire is circular and if the radius of this circle decreases to half its original value die to the stretch of the wire by a load, then the modulus of elasticity of the wire be

1 point

Unaffected

Halved

Doubled

One fourth of its original

Clear selection

A T-Section beam is simply supported and subjected to a uniform distributed load over its whole span. Maximum longitudinal stress in the beam occurs at

1 point

The junction of web and flange

The mid-section of the web

The bottom fiber of the web

Top fiber of the flange

Clear selection

In the case of bi-axial state of normal stresses, the normal stress on 45° plane is equal to

1 point

The sum of the normal stresses

Difference of the normal stresses

Half the sum of the normal stresses

Half the difference of the normal stresses

Clear selection

A circular shaft subjected to twisting moment results in maximum shear stress of 60 MPa. Then the maximum compressive stress in the material is

1 point

30 MPa

90 MPa

120 MPa

60 MPa

Clear selection

For the centrally supported uniform beam as shown the values F1 and F2, when the beam is in equilibrium, are respectively

2 points

2.5 kN, 2.5 kN

1.5 kN, 3.5 kN

3.5 kN, 1.5 kN

7 kN, 3 kN

Clear selection

Choose the wrong statement

1 point

A diagram which shows the values of shear forces at various sections of structural member is called shear force diagram

The magnitude of the bending moment at any section of a beam is equal to the vector sum of the two moments (about the sections) due to the forces acting on the beam of any one side of the section

The shear force at any section of a beam is equal to the total sum of the forces acting on the beam on any side of the section.

A simply supported is one which is supported on more than two supports.

Clear selection

A mild steel specimen is tested under tension and a continuous graph between load and extension is obtained. A load at which there is considerable extension without increase in resistance is called

1 point

Lower yield load

Ultimate load

Breaking load

Upper yield load

Clear selection

State of stress in plane element is shown in figure. Which one of the correct sketch of Mohr’s circle of the state of stress?

1 point

Option 2

Option 3

Option 4

Option 1

Clear selection

Shear stress distribution for a rectangular beam subjected to transverse loading is

1 point

Option 2

Option 1

Option 4

Option 3

Clear selection

Consider the following statements in case of beams: Which of the following statement is NOT correct?

1 point

Rate of change of shear force is equal to the rate of loading at a particular section

Rate of change of bending moment is equal to the shear force at a particular section.

Maximum shear force in a beam occurs at a point where bending moment is either zero or bending moment changes sign.

None of the above.

Clear selection

Measured mechanical properties of material are same in a particular direction at each point. This property of the material is known as

1 point

Isotropy

Anisotropy

Orthotropy

Homogeneity

Clear selection

2 points

2 only

2 and 3 only

3 and 4 only

1,2 and 4 only

Clear selection

Auto fretage is the method of

1 point

Prestressing thick cylinder

Calculating stresses in thick cylinder

Increasing the life of thick cylinders.

Joining thick cylinder

Clear selection

In a close coiled helical spring, the spring index is given by D/d where D and d are the mean coil diameter and wire diameter respectively. For considering the effect of curvature, the Wahl’s stress factor K is given by

1 point

Option 3

Option 4

Option 2

Option 1

Clear selection

A cantilever beam of rectangular cross-section is subjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be

1 point

One-Sixteenth

Double

One-eigth

Half

Clear selection

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