A source which can be represented by a voltage source of 8 V A source which can be represented by a voltage source of 8 V rms in series with an internal resistance of 2k ? is connected to a 50-? load resistance through an ideal transformer. Calculate the value of turns ratio for which […]
Repeat Problem 10.6, using MATLAB to plot the inductor current Repeat Problem 10.6, using MATLAB to plot the inductor current for the first 10 cycles following the switch closing at time t = 0.
A six-pole, 60-Hz synchronous machine has a rotor winding with A six-pole, 60-Hz synchronous machine has a rotor winding with a total of 138 series turns and a winding factor kr = 0.935. The rotor length is 1.97 m, the rotor radius is 58 cm, and the air-gap length = 3.15 cm. a. What is […]
Repeat Problem 3.4, assuming that the inductor is connected Repeat Problem 3.4, assuming that the inductor is connected to a voltage source which increases from 0 to 0.4 V (part [a]) and then is held constant at 0.4 V (part [b]). For both calculations, assume that all electric transients can be ignored.
Repeat Example 8.3 under the condition that the rotor speed Repeat Example 8.3 under the condition that the rotor speed is 4500 r/min and that a negative voltage of -250 V is used to turn off the phase current.
Repeat Problem 10.1 assuming the diode to have a fixed Repeat Problem 10.1 assuming the diode to have a fixed 0.6 V voltage drop when it is ON but to be otherwise ideal. In addition, calculate the time-averaged power dissipation in the diode.
Repeat Problem 5.24 assuming that the saturated direct-axis sync Repeat Problem 5.24 assuming that the saturated direct-axis synchronous inductance Xd is equal to that found in Problem 5.15 and that the saturated quadrature-axis synchronous reactance Xq is equal to 75 percent of this value. Compare your answers to those found in Problem 5.24.
Repeat Example 8.1 for a machine identical to that considered Repeat Example 8.1 for a machine identical to that considered in the example except that the stator pole-face angle is β = 45Â
The magnetic circuit of figure consists of a core and a The magnetic circuit of figure consists of a core and a moveable plunger of width lp, each of permeability µ. The core has cross-sectional area A and means length Ac. The overlap area of the two air gaps Ag is a function of the […]
The nameplate of a dc generator indicates that it will The nameplate of a dc generator indicates that it will produce an output voltage of 24 V dc when operated at a speed of 1200 r/min. By what factor must the number of armature turns be changed such that, for the same field-flux per pole, […]