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a salient pole 60 Hz synchronous motor with a squirrel cage winding on the rotor which is used for starting purposes.
(a) What is the frequency of the current in the squirrel cage rotor conductors immediately after the motor is energized? (The motor was initially at standstill.)
(b) What is the frequency of the current in the squirrel cage rotor conductors after the field is energized and the machine is operating at steady state?
(c) Assume the machine is initially at steady state operating at rated voltage and unloaded, when a three-phase short circuit occurs on the terminals of the machine. If you could monitor the current in the squirrel cage conductors, what would you expect to see? Explain.
(d) The equal area criteria to determine if a synchronous machine will remain "stable" after a disturbance is essentially an application of the principle of conservation of energy. Very briefly describe how this process can be used to describe the response of the machine to a particular transient.
The two blocks in the figureoscillate on a frictionless surface with a period of 1.7 s. The upper block just begins to slip when the amplitude is increased to 32cm. What is the coefficient of static friction between the two blocks
Design the instruction decoder using AND, OR, and inverter gates todecode the 3-bit op codes (bits D7, D6, D5, of 8-bit instruction)and produce the ADD, SUB, IN, OUT, and MOV control signals (thecontrol signal will be "1" when i asserts)
if we have an amplifier whose spec. is 2nV/rtHz and the bandwidth of the amplifier extends from 100Hz to 10kHz, and the gain of the amplifier is 5, how much noise should we expect at the output of the amplifier
A sequential circuit has one input X, and two outputs Z1 and Z2. The outputs represent the number of 0's that have3 appeared in the last three inputs. For example, X:0110111100001011 Z1:0000000001111100 Z2:1111110010110011
1.The signal is 10 sin (pi 500t +30deg). The amplitude of this signal is 2.The signal is 2 sin(pi 1500 t + 60deg). The frequency of the signal is 3.The signal is 5 sin(4 pi 800t - 80 deg). The phase of this signal is
A laser (wavelength fo = 633 nm) is generating a Gaussian beam with 0.1 mm beam waist (2wo). (1) Find the beam's divergence angle and depth of focus (2) What will be its diameter when it reaches Moon
A parallel plate capacitive sensor is used to measure displacement. The area of the plates is A and the gap between the plates is d. The space between the plates is completely filled by material with a dielectric constant of er.
A 500 hp, three-phase, 2200 V, 60 HZ, 12-pole, Y-connected, wound-rotor induction motor has the following parameters: R1 = .225 ohm : R'2= .235 ohm Xeq = 1.43 ohm and Xm = 31.8 ohm and Rm = 780 ohm
A solenoid of length=0.7 m and radius R=5cm stores an amount of energy U=6x10^-6 J when a current I=0.4 A passes through it. What is the winding density of the solenoid
Two soccer players start from rest, 34 m apart. They run directly toward each other, both players accelerating. The first player's acceleration has a magnitude of 0.42 m/s2. The second player's acceleration has a magnitude of 0.41 m/s2.
Assume initially that no inputs have been seen and create a special initial state with output 0 to start the Moore machine. Draw a state graph for a Moore machine (minimum number of states is 6).
All the script needs to do is make a two 10 by 10 grids, one for the user, one for the computer. Allow the user to choose where to place their ships, and in which direction. Then have the computer randomly place its ships.
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