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Q. The self and mutual inductances of a machine with two windings are given by L11 = (1 +sin θ), L22 = 2(1 + sin θ), and L12 = L21 = M = (1-sin θ). Assuming θ = 45°, and letting coils 1 and 2 be supplied by constant currents I1 = 15 A and I2 =-4 A, respectively, find the following:
(a) Magnitude and direction of the developed torque.
(b) Amount of energy supplied by each source.
(c) Rms value of the current in coil 2, if the current of coil 1 is changed to a sinusoidal current of 10 A (rms) at 60 Hz and coil 2 is short-circuited.
(d) Instantaneous torque produced in part (c).
(e) Average torque in part (c).
Q. For the mechanical spring-mass-friction system shown in Figure, the differential equation relating the force F(t) and the velocity u(t) is given by where M is themass,D
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