Asquare fin with sides of length t=1 cm, overall length l=6 cm, and thermal conductivity k=10 w/m-k is subjected to convection (h=40 w/m2-k, t=20"c) around its surface, including the tip. it is also generating energy (q=2x105 w/m*) uniformly throughout its volume. the fin has a constant base temperature tb=40°c. use the finite difference method with 5 nodes to estimate t(x )plot t(x) from the base (x=0) to the tip (x=l). how would your graph change if q=0 (no internal generation)?

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

What precautions should you take to prevent injuries when dealing with heavy loads?

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?