- The Power Ulp' up to a 3 d induction maso in Go ker The stator coses total \( 1 \mathrm{kw} \). Find the tatal mech. Poror deroloped and boro eV-losets. if ship \( =3 \%[57 \cdot 2 \mathrm{~km}, 590 \mathrm{~W}] \)
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A three phase Y- connected load takes 50 A current at 0.707 lagging pf at 220 V between the lines. A three phase Y-connected round rotor synchronous motor, having a synchronous reactance of 1.27 ohms per phase is connected in parallel with the load. The power developed by the motor is 33 kW at a power angle of 300. Neglecting armature resistance, calculate the overall power factor of the motor and the load.
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Consider the two-pole motor shown in Figure 16.10 on page 778 . The gap between the rotor and stator is $1.5 \mathrm{mm}$. Each of the two ficld coils has 250 turns and carries a current of 3 A. Assume that the permeability of the iron is infinite, a. Determine the flux density in the air gap. b. Each armature conductor carries a current of $30 \mathrm{A}$ and has a length of $0.5 \mathrm{m}$. Find the force induced in each conductor.
(III) 65 $\mathrm{k} \mathrm{W}$ is to arrive at a town over two $0.100-\Omega$ lines. Estimate how much power is saved if the voltage is stepped up from 120 $\mathrm{V}$ to 1200 $\mathrm{V}$ and then down again, rather than simply transmitting at 120 $\mathrm{V}$ . Assume the transformers are each 99$\%$ efficient.
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