Agas at pressure p=700kpa and temp t1=510°c flows with velocity w1=30m/s into vertical pipe of inlet and exit diameter d1=100mm and d2=120mm respectively. the gas leaves the pipe having p2=530kpa and t2=300°c at the height delta(triangle) z =30m above its inlet. determine magnitude and direction of heat exchange between the gas and the surrounding. the specific heat at constant pressure for the gas is cp=1.34kj/kg and its specific enthalpy is given by following formula h=cpt . the gas density can be found from an ideal gas relationship pv=mrt assuming that individual gas constant is r=223.5j/kg/k.

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

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

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?