  # ISRO Scientist or Engineer Mechanical 2007

Instructions

For the following questions answer them individually

Question 51

# Fora body subjected to direct stresses $$\sigma x, \sigma y$$ and $$\sigma z$$ the direct strain $$ε_x$$ in x direction is (where E and $$\gamma$$ are Young’s Modulus and Poisson’s ratio respectively) Question 52

# A circular shaft subjected to torsion undergoesa twist of $$1^\circ$$ in a length of 120 cm. If the maximum shear stress inducedis limited to 1000kg/cm$$^2$$ and if modulus of rigidity $$G = 0.8 * 10^6 Kg/cm^2$$, then the radius of the shaft should be Question 53

# A hollow shaft of same cross-section area as solid shaft transmits Question 54

# The extension of a mild steel bar 4m long, 2000 mm$$^2$$ cross section under the action of an axial load of 20kN, if E = 2(10$$^5$$) N/mm$$^2$$, is Question 55

# InIsection shear load is resisted mainly by Question 56

# Shear force is Question 57

# Maximum shear stress in Mohr’s circle is equal to Question 58

# If a material expands freely dueto heating it will develop Question 59

# When acolumn is fixed at both ends, corresponding Euler’s critical load is Question 60

# A metal pipe of 1 m diameter contains a fluid having a pressure of 10 kgf/cm$$^2$$. If the permissible tensile stress in the metal is 200 kgf/cm$$^2$$, then the thickness of the metal required for making the pipe would be OR