Avertical cylinder (fig. p3.227) has a 61.18-kg piston locked with a pin trapping 10 l of r-410aat 10%c, 90% quality inside. atmospheric pressure is 100 kpa, and the cylinder cross-sectional area is 0.006 m2. the pin is removed, allowing the piston to move and come to rest with a final temperature of 10%c for the r-410a. find the final pressure, final volume and the work done and the heat transfer forthe r-410a.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan