Q.4. two thermocouples (temperature measurement devices) are tested by inserting their probes in boil- ing water, recording the readings, removing and drying the probes, and then doing it again. the results of five measurements are as follows: t(°c)-thermocouple a | 72.4 | 73.1 | 72.6 72.8 | 73.0 t(c) thermocouple b 973 1014 98.701100.4 (a) for each set of temperature readings, calculate the sample mean, the range, and the sample (b) which thermocoupie readings exhibit the higher degree of scatter? which thermocouple is more standard deviation. accurate?

True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure

Determine the damped natural frequencies and the steady state response of a decoupled damped forced two degrees of freedom system. 10ä1 + 2q1 20q1 10 cos t; 10q2 +4q2 + 40q2 10 cos t

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.