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With the table of standard resistor values given in Appendix A, design a voltage divider to provide the following approximate voltages with respect to ground using a 30 V source: 8.18 V, 14.7 V, and 24.6 V. The current drain on the source must be limited to no more than 1 mA. The number of resistors, their values, and their wattage ratings must be specified. A schematic showing the circuit arrangement and resistor placement must be provided.
A switch-mode dc-dc converter is operating at a switching frequency of 20kHz, and Vd=150V. The average current being drawn by the dc motor is 8.0 A. In the equivalent circuit of the dc motor, Ea=100V, Ra=0.25 ohm, and La=4mH.
If the two machines have different numbers of poles but exactly the same shaft speed, then the electrical frequency of the two machines will be different due to Equation (3-34). What combination of poles on the two machines could convert 60 Hz pow..
The Dynamics of the system are determined by the second order transfer function of the sensing element , which has a natural frequency of ωn=40 rad/sec and a damping ratio =0.1.
For either the original system or its transpose, determine the difference equation relating the input x[n] to the output y[n]. (Note: The difference equations will be the same for both structures.)
Vehicles arriving at an intersection can turn right or left or can continue straight ahead. In a study of traffic patterns at this intersection over a long period of time, engineers have noted that 40% of the vehicles turn left, 25% turn right, an..
Calculate and plot the required current and the resulting voltage Va that should be applied to the armature terminals of the machine. As intermediate steps, calculate and plot Ea, the required electromagnetic torque Tem from the motor, and the cur..
If the signal amplitude across the base-emitter junction is to be limited to 10 mV, what is the corresponding amplitude of vsig and v0 Find the open-circuit voltage gain Gvo and the output resistance Rout. Use these values first to verify the value ..
A series-connected load draws a current i(t)=4cos(100pt + 10°) A when the applied voltage is v(t) = 120cos(100pt-20°) V. Determine a) The circuit‘s apparent power b) The power factor, pf c) The value of the impedance Z
Determine the real, apparent, and reactive powers of the unknown load; and - the pf of the unknown load.- determine the resistance that corresponds to a power factor of 0.96.
The nameplate on a 50 kVA transformer shows a primary voltage of 480 V and a secondary voltage of 120 V. We wish to determine the approximate number of turns on the primary and secondary windings.
Let x[n] be a finite sequence that is nonzero for n [N1, N2], and h(n) be a finite sequence that is nonzero n [N3, N4]. Answer the followings: a. For fixed n, what is the range of k that makes h(n-k) nonzero
We use the time constant to characterize transients in electric circuits. In physics, the half-life is often used to characterize the exponential decay of physical quantities such as radioactive substances.
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