The aluminum rod (E1-75 GPa) is reinforced with the firmly bonded steel tube (E2 = 197 GPa). The diameter ofthe aluminum rod is d = 21 mm and the outside diameter of the steel tube is D = 42 mm. The length of the composite column is L-754 mm. % Matlab input: L = 754 ; d = 21; D = 42; E1 75 ; E2 = 197 ; P 99; A force P is applied at the top surface, distributed across both the rod and tube. Determine the normal stress σ in the aluminum rod when P = 99 kN.

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

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?

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.