For a fruit juice, shear stresses are measured by a viscometer as a function of
shear rate (the velocity gradient). When the shear stress in N/m2 is plotted
against the shear rate in the range of 0 to 50 s-1, a straight line having a slope of
0.4 is obtained. What is the viscosity of this fluid when the shear rate is 31.4 s-1?
a) 78.5 Pa. s b) 12.6 Pa. s c) 31.8 Pa. s d) 3.97 Pa. s e) 0.4 Pa. s

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?