A material of youngs modulus and Poissons ratio of unity is subjected to two principal stresses Ïƒ1 and Ïƒ2 at a point in two dimensional stress system. The strain energy per unit volume of the material is ________

Civil Engineering : Strength of Materials - Quiz(MCQ)

(Ïƒâ‚Â² â€“ Ïƒâ‚‚Â² â€“ 2Ïƒâ‚Ïƒâ‚‚ ) / 2E

(Ïƒâ‚Â² + Ïƒâ‚‚Â² â€“ 2Ïƒâ‚Ïƒâ‚‚ ) / 2E

(Ïƒâ‚Â² + Ïƒâ‚‚Â² + 2Ïƒâ‚Ïƒâ‚‚ ) / 2E

None of the above

Correct Answer : (Ïƒâ‚Â² + Ïƒâ‚‚Â² â€“ 2Ïƒâ‚Ïƒâ‚‚ ) / 2E

Explanation : Strain energy = (σâ‚εâ‚+ σâ‚εâ‚ ) / 2E

= (σâ‚² + σâ‚‚² – 2σâ‚σâ‚‚ ) / 2E.

Recently Updated in Strength of Materials Questions

The structures constructed along are distributaries are called as _______

Inlets

Outlets

Channels

Distributaries

Correct Answer : Option (B) : Outlets

Explanation : An outlet is a simple and small irrigation structure which is constructed along the distributaries. The amount of water that is withdrawn through the outlet is in proportion to the area that is irrigated below respective point.

The upstream slope recommended for sand and gravel with RCC core wall is ______

2.5:1

1:2

3:1

1.5:1

Correct Answer : Option (A) : 2.5:1

Explanation : According to Terazghi, the following upstream slopes should be recommended.

1. Homogeneous well graded – 2.5 : 1
2. Homogeneous coarse silt – 3 : 1
3. Sand and gravel with RCC core wall – 2.5 : 1.

Major distributaries discharge varies from _______

0.25 to 5 cumecs

2 to 4 cumecs

1.5 to 5 cumecs

1.2 to 5 cumecs

Correct Answer : Option (A) : 0.25 to 5 cumecs

Explanation : The major distributary takes off from a branch canal to distribute the water to various parts of the field. The supply of the water varies from 0.25 to 5 cumecs.