12 mol/s O2 at 2 atm and 400K is first compressed adiabatically to 15 atm with a compressor operating at 75% isentropic efficiency, then intercooled to 500K before being sent to a second adiabatic compressor
operating at 80% isentropic efficiency which compresses the gas to 40 atm. Calculate the temperature at
the end of each compression stage, as well as the entropy generated in each stage and the amount of heat
that must be removed in the intercooling stage

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Which from the following instrument is commonly used to detect the high pitch butzing sound in bearings? [clo4] a)-digital ultrasonic meter b)-infrared camera c)-spectroscopic d)-vibrometer

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false