Consider an ideal Brayton cycle for a jet engine consisting of a compressor, combustion chamber, turbine and nozzle. The pressure and temperature entering the compressor are 105 Pa and 300 K respectively. The pressure ratio across the compressor is 6 to 1, the temperature at the turbine inlet is 1000 K, and the pressure at the nozzle exit is 10 Pa Assume that cp remains constant through the engine at a value of 1000 J/kgK and y1.4 Calculate:
a) sure at the exit of the compressor.
b) Temperature at the exit of the compressor.
c Prssure at the exit of the combustion chamber
d) Temperature at the exit of the turbine.
e) ssure at the exit of the turbine.
f) Temperature at the exit of the nozzle.
g) Gas velocity at the exit of the nozzle.

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)