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The strain energy stored in a solid circular shaft subjected to shear stress (t) is (where C = Modulus of rigidity for the shaft material)
| A. |  Â x Volume of shaft |
| B. |  Â x Volume of shaft |
| C. |  Â x Volume of shaft |
| D. |  Â x Volume of shaft |
When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.
| A. | single riveted |
| B. | double riveted |