In a gas turbine unit, the gases flow through the turbine at 12 kg/s and the specific work done by the turbine is 750 kJ/kg. The enthalpies of gases at the inlet and outlet are 1280 kJ/kg and 450 kJ/kg respectively, and the velocity of gases at the inlet and outlet are 45 m/s and 120 m/s, respectively. Calculate: (a) The rate at which heat is rejected to the turbine. (b) The area of the inlet of the pipe given that the specific volume of the gases at the inlet is 0.4 m3/kg.

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

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines