An airplane weighing 73.6 kN has elliptic wings 15.23 m in span with no geometric twist and a planform area of 19.8 m2. For a speed of 90 m/s in steady, level flight at sea level ( = 1.2256 kg/m3) calculate the value of the circulation in the plane of symmetry (o), the downwash velocity, w, the induced drag, D, i, the geometric angle of attack, , and the effective angle of attack, eff. Assume that L=0 = -1.2°.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

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

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.