find the solidification time of the two iron castings when both are poured

(with no superheats) into the sand molds at initial temperature 28°c.

(i) a slab shaped casting of 10 cm thickness, (ii) a sphere of 10 cm in dia. iron: freezing temp: 1540°c; l= 272 kj/kg; density = 7850 kg/m3 sand: c = 1.17 kj/kg-k; k = 0.865 w/mk; density = 1600 kg/m3

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above