Ashaft is subjected to a torque of 28knm and a maximum bending moment of 25knm. the shaft is solid with a diameter of 125mm. i. construct a mohr’s circle on the graph paper provided. ii. using the mohr’s circle method find the values for the principal stresses and the maximum shear stresses on the shaft. iii. show the orientations of the planes on which the principal stresses act on a rotated element. iv. use the complex stress equations to confirm.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

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