The results of the no-load and blocked-rotor tests on a 3-φ, y-connected, 60-hz, 2000-hp induction machine with a stator phase resistance of 0.02 ω are as follows: no-load test: total input power = 11.617 kw line-to-line voltage = 2300 v line current = 26.55 a blocked-rotor test: total input power = 319.22 kw line-to-line voltage = 462.68 v line current = 407.75 a frequency = 60 hz (a) calculate the parameters r1, x1, xm, r’2, and x’2 of the approximate equivalent circuit. (b) draw the equivalent circuit of the induction motor using the parameters from 3(a).

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.