Engineering, 18.01.2021 14:00 rdemp6105
A copper bare wire, stranded, size 4/0 AWG is being tested in a laboratory (free air test), where the ambient temperature is 30 C (86 F). It is assumed that the damage temperature for this wire is 200 C. According to the results of previous tests, a factor h = 28 W/(㎡ K) can be used for a simplified first-order approximation. Using the simplified model described in class:
a. Determine what would be the cable's ampere rating (IN) for a rated temperature of 65 C and the given ambient temperature
b. Determine the cable's minimum damage current (Id)
c. Determine the rt=Ky of the wire (approximated damage curve)
d. Plot the approximated damage curve in a log-log scale
e. Plot the "exact" (Approximation 1) damage curve in the same graph and compare. For which current value the two curves are practically equal?
f. Determine and plot the second approximation for the damage curve (T-Ind27t=K',d). Compare the plots of all the three damage curves
Answers: 3
Engineering, 04.07.2019 18:10
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
Answers: 1
Engineering, 04.07.2019 18:10
Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when
Answers: 1
Engineering, 04.07.2019 18:20
Asimple rankine cycle uses water as the working fluid. the water enters the turbine at 10 mpa and 480c while the condenser operates at 6 kpa. if the turbine has an isentropic efficiency of 80 percent while the pump has an isentropic efficiency of 70 percent determine the thermal efficiency
Answers: 1
Engineering, 04.07.2019 19:10
Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false
Answers: 3
A copper bare wire, stranded, size 4/0 AWG is being tested in a laboratory (free air test), where th...
Computers and Technology, 04.12.2019 23:31
Mathematics, 04.12.2019 23:31
English, 04.12.2019 23:31
Mathematics, 04.12.2019 23:31