Engineering, 05.10.2019 12:00 7431335
Awell-insulated rigid tank contains 6 lbm of saturated liquid-vapor mixture of water at 30 psia. initially, 20% of the mass is in the liquid phase. an electric resistance heater placed in the tank is turned on and kept on until all the liquid in the tank is vaporized. assuming the surroundings to be at 75°f and 14.7 psia, determine (a) the exergy destruction and (b) the second-law efficiency for this process.
Answers: 3
Engineering, 04.07.2019 18:10
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
Engineering, 04.07.2019 18:10
Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.
Answers: 3
Engineering, 04.07.2019 18:10
Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)
Answers: 3
Engineering, 04.07.2019 18:10
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.
Answers: 3
Awell-insulated rigid tank contains 6 lbm of saturated liquid-vapor mixture of water at 30 psia. ini...
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