MECHANICAL ROCKS

1)   The ratio of stress and strain is known as _____ a. Modulus of elasticity b. Young's modulus c. Both a. and b. d. None of the above 2)   The actual breaking stress in stress-strain diagram is the ratio of ______ a. load at breaking point and original cross-sectional area b. load at breaking point and reduced cross-sectional area c. maximum load and original cross-sectional area d. yield load and original cross-sectional area 3)   A rigid body has Poisson's ratio equal to _____ a. 0 b. 1 c. less than 1 d. greater than one 4)   A rectangular bar has volume of 1.5 x 10 6 mm 3 . What is the change in volume, if stresses in x, y and z direction are 100 Mpa, 150 Mpa and 160 Mpa respectively. (Assume K = 2 x 10 5 N/mm 2 & μ = 0.3) a. 1000 mm 3 b. 1230 mm 3 c. 1500 mm 3 d. 2000 mm 3 5)   Two parallel, equal and opposite forces acting tangentially to the surface of the body is called as _____ a. Complement

 What Are Tar Sands? Tar sands (also referred to as oil sands) are a combination of clay, sand, water, and bitumen , a heavy black viscous oil. Tar sands can be mined and processed to extract the oil-rich bitumen, which is then refined into oil. The bitumen in tar sands cannot be pumped from the ground in its natural state; instead tar sand deposits are mined, usually using strip mining or open pit techniques, or the oil is extracted by underground heating with additional upgrading. Tar sands are mined and processed to generate oil similar to oil pumped from conventional oil wells, but extracting oil from tar sands is more complex than conventional oil recovery. Oil sands recovery processes include extraction and separation systems to separate the bitumen from the clay, sand, and water that make up the tar sands. Bitumen also requires additional upgrading before it can be refined. Because it is so viscous (t