Consider an isotropic aluminum alloy with Young's modulus E = 68.9 GPa, Poisson's ratio v = 0.33, and shear modulus G = 25.9 GPa. Find the strains Ex, Ey, and Yxy for the following stress loads: a) Ox = 100 MPa, y = 0 MPa, Txy = 0 MPa b) Ox = 0 MPa, y = 0 MPa, Txy = 20 MPa c) Ox = 100 MPa, y = –100 MPa, Txy = 0 MPa d) Ox = 100 MPa, y = 100 MPa, Ixy = 20 MPa

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information