Q1) A rod consisting of two cylindrical portions AB and BC is restrained at both ends. Portion AB is made of steel (Es= 200 GPa, αs= 11.7 x 10-6

/°C) and portion BC

of brass (Eb= 105 GPa, αb= 20.9 x 10-6

/°C). Knowing that the rod is initially

unstressed, determine,

a) the reactions at A and B by a temperature rise of 55°C.

b) the normal stresses induced in portions AB and BC by a temperature rise of

55°C.

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.

What precautions should you take to prevent injuries when dealing with heavy loads?

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit. explain why the pneumatic piston stumbles when it hits an obstacle.