Water at a pressure of 15 bar at a temperature of 30°c enters a boiler, where it is heated to 250°c at constant pressure. steam leaving the boiler passes into a throttle which reduces the pressure to 10 bar. the steam is then passed through a small turbine, exiting at atmospheric pressure at 110°c. draw a schematic diagram. 1. how much heat is added per kg to the water by the boiler? 2. find the temperature of the steam leaving the throttle. 3. if the turbine produces 15kw of work, find the mass flowrate of steam through the system.

Ashielded metal arc-welding operation is accomplished in a work cell by a fitter and a welder. the fitter takes 5.5 min to load components into the welding fixture at the beginning of the work cycle, and 1.5 min to unload the completed weldment at the end of the cycle. the total ength of the weld seams 1200 mm, and the travel speed used by the welder averages 300 mm/min. every 600 mm of seam length, the welding stick must be changed, which takes 0.8 min. while the fitter is working, the welder is idle (resting): and while the welder is working the fitter is idle. (a) determine the average arc-on time as a fraction of the work cycle time. (b) how much improvement in arc-on time would result if the welder used flux-cored arc welding (manually operated), given that the spool of weld wire must be changed every 10 weldments, and it takes the welder 5.0 min to accomplish the change? (c) what are the production rates for these two cases (weldments completed per hour)? attach your work and solutions.