2. A concrete gravity dam has the following dimensions: Max water level = 305 m Bed level of river = 225 m, crest level = 309 m, D/S face slope starts at 300 m, D/S Slope= 2:3, C/L of drainage galleries at 8m d/s of u/s face, Uplift pressures: at Heal = 100 %, at Toe = 0 % at drainage gallery = 50 %. Assume density of concrete=2400kg/m3, no tail water, consider only self weight, hydrostatic and uplift pressure. Check the stability of dam for 1) rotation and overturning, 2) Translation and sliding, 3) overstress and material failure.

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.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.