Problem 1 The stresses at a certain point in a cast iron machine part are Ox= 40 MPa, Oy= -50
MPa and Txy = 30 MPa (C. W). Determine analytically the safety factors
guarding against static failure according to the Coulomb-Mohr and
modified Mohr theories. The ultimate tensile and compressive stresses of the cast
iron are 150 MPa and 600 MPa respectively.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false