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A shunt motor has the following ratings: 75 kW, 240 V, 1750 rpm, 300 A. The motor is supplied with 240 V source (constant) at its armature terminals. Its armature resistance is 0.0144 [O]. At rated current Ia = 300 A, the motor runs at rated speed of 1750 rpm.
(a) Compute the output power Pout, torque T, and speed sm of the motor at armature current of Ia = 0 [A].
(b) Repeat the solution for armature current Ia = 150 [A].Units: Find the speed sm in [rad/s], the ouput power Pout in [kW], and the torque T in [N m].Conversion factors: 1 rpm = 1 rev/min. 1 rev = 2p rad. 60 s = 1 min.
A DT system has the unit pulse response h[nT] = (0.4)^-|n|. Find and plot the system zero-state response to the input signal x[nT] = u[(n+2)T] + u[(u-2)T]
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Design a Miller integrator with a time constant of 0.1 s and an input resistance of 100 k ohm. A dc voltage of -1 volt is applied at the input at time 0, at which moment vO = -10 V. How long does it take the output to reach 0 V to +10 V
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A lighting load operates from a 208-V 60-Hz supply and is rated 1.0 kW with a power factor of 0.9 lagging. A 40-µF capacitor is connected in parallel with this load. Calculate the total power factor and the percent change in line current.
The Russian president and the Chinese counterpart need to come to an agreement by telephone. Neither can speak and understand each other's language. They need to employ translators. Compare this layered communication to OSI layers
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120V, 60 Hz source is connected to a distribution line whose resistance, and inductive reactances are 0.1Ohm, j0.2 Ohm, respectively. Single phase, 2HP, 120V, 0.75 lagging pf. motor and 2.4Kw, 120V heater is connected in parallel.
An amplifier has a gain of 10 and follow a bandpass filter filter where the loss in the in the center of the bandpass is 0.05. What is the combined gain/loss of the two cascaded blocks at the center frequency of the filter
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