# Two circular mild steel bars A and B of equal lengths l have diameters dA= 2 cm and dB= 3 cm. Each is subjected to a tensile load of magnitude P. The ratio of the elongations of the bars lA / lB is:

1.  2/3

2.  3/4

3.  4/9

4.  9/4

4

9/4

Explanation :
No Explanation available for this question

# In a two-dimensional stress system, the radius of the Mohr’s circle represents:

1.  Maximum normal stress

2.  Minimum normal stress

3.  Minimum shear stress

4.  Maximum shear stress

4

Maximum shear stress

Explanation :
No Explanation available for this question

# A fission chain reaction in uranium can be developed by:

1.  Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

2.  Accelerating fast neutrons

3.  Absorbing all neutrons

4.   Using moderator

4

Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

Explanation :
No Explanation available for this question

# Steel has proportionality limit of 300MPa in simple tension. It is subjected to principal stresses of 120 MPa (tensile), 60 MPa (tensile) and 30 MPa (compressive). What is the factor of safety according to maximum stress theory

1.  1.5

2.  1.75

3.  1.8

4.  2.0

4

2.0

Explanation :
No Explanation available for this question

# The polar moment of inertia of the cross-section of the member is required to assess the strength of the member in:

1.  Bending

2.  Torsion

3.  Axial force

4.  Shear

4

Torsion

Explanation :
No Explanation available for this question

# A freely supported beam AB of span 4 m is subjected to a UDL of 1kN/m over the full span and a moment of 2kN-m at support A as shown in the figure. The resulting BM at mid-span C of the beam will be:

1.  1kN-m (sagging)

2.  1kN-m (hogging)

3.  2kN-m (sagging)

4.  2kN-m (hogging)

4

1kN-m (sagging)

Explanation :
No Explanation available for this question

# A cylindrical shell of 100 cm diameter made of mild steel plate is to be subjected to an internal pressure of 10 kg/cm2 factor of safety as 4 and using maximum principal stress theory, the requisite thickness of the plate will be:

1.  8 mm

2.  10 mm

3.  12 mm

4.  15 mm

4

10 mm

Explanation :
No Explanation available for this question

# According to maximum shear stress failure theory, yielding occurs in the material when:

1.  Maximum shear stress = yield stress

2.  Maximum shear stress = 2 times yield stress

3.  Maximum shear stress = 1/2 of yield stress

4.  Maximum shear stress = √2 times yield stress

4

Maximum shear stress = 1/2 of yield stress

Explanation :
No Explanation available for this question

# For the design of a cast iron member, the most appropriate theory of failure is:

1.  Mohr’s theory

2.  Rankine’s theory

3.  Maximum stress theory

4.  Maximum shear energy theory

4

Rankine’s theory

Explanation :
No Explanation available for this question

# In triggering fission, the following types of neutrons are desirable:

1.  Fast moving

2.  Slow moving

3.  Critical neutrons

4.  Neutrons at rest

4