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Consider a shunt-connected dc motor that has the magnetization curve shown in Figure. The dc supply voltage is VT = 200 V, the armature resistance is RA = 0.085Ω, the field resistance is RF = 10Ω, and the adjustable resistance is Radj = 2.5Ω. At a speed of 1200 rpm, the rotational loss is Prot = 1000W. Assume that the rotational power loss is proportional to speed.
a. With a load that demands a torque of Tload = 200 Nm independent of speed, determine the steady-state armature current.
b. Suppose that in starting this machine, the field circuit has reached steady state and the motor is not moving when power is applied to the armature circuit. What is the initial value of IA? Determine the starting value of the developed torque. Compare these values to the steady-state values from part (a).
c. What additional resistance must be inserted in series with the armature to limit the starting current to 200A? Find the starting torque with this resistance in place.
1) For a semiconductor E vs kx near the band edge Ec is given by E=Ec +(h2/16m0)*kx2 Determine the effective mass of electrons in the conduction band. Here m0 is the mass of a free electron. 2) E vs. kx for electrons near the valence band edge Ev can..
Two parallel connected 10 kV to 120 V 60 Hz single phase transformers supply a varying load. When the total secondary load current is 250 A at 0.85 PF lagging, determine the secondary current and operating PF of each transformer.
A load ZL is connected to the secondary of a linear transformer that is characterized by inductance's L1 = 1 H and L2 = 4 H and a unity coefficient of coupling. If w(omega) = 1000 rad/s, find the equivalent series network (R, L, and C values) seen..
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The electric field outside a uniformly charged, infinite cylindrical conductor is the same as if the cylinder's charge were concentrated in a thin wire along the cylinders axis. Moreover, the potential inside a uniformly charged infinite cylindric..
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Show that the time displacement in a periodic function has no effect on the magnitude spectrum, but changes the phase spectrum by an amount of -nω0τ radians for the component of the frequency nω0 if the time displacement is τ.
You are to design a Gray code sequence generator.The 4-bit Gray-code sequence is defined as follows: 0000, 0001,0011, 0010, 0110, 0111, 0101, 0100, 1100, 1101, 1111, 1110, 1010,1011, 1001, 1000.
the voltage drops across three resistors in series are measured 10v 15v and 25v. if the largest resistor is 47 ohms
Explain why an instrumentation amplifier has more than one stage? How would you increase the output current of an op-amp?
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