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Consider a motor supplied by a generator, each with a separate and constant field excitation. Assume the internal voltage E of the generator to be constant, and neglect the armature reaction of both machines. With the motor running with no external load, and the system being in steady state, let a load torque be suddenly increased from zero to T. The machine parameters are as follows:
Armature inductance of motor + generator, L = 0.008 H
Armature resistance of motor + generator, R = 0.04 Ω
Internal voltage of the generator E = 400 V Moment of inertia of motor armature and load
(a) The undamped angular frequency of the transient speed oscillations, and the damping ratio of the system.
(b) The initial speed, final speed, and the speed drop in r/min.
A 900-MW powerplant of the pressurized-water nuclear-reactor type uses once-through cooling from a river. Regulations do not permit cooling water discharge back to the river hotter than 5°C above river ambient. Estimate a.) the necessary water flow, ..
Show and explain how you could make a 2-bit counter that will count up or down on an external control signal. Explain the difference between the input and output times.
Implement switching function of 4 variables H(A,B,C,D)= AB'+BC+A'CD using a 4 to 1 Multiplexer and any number of 2 to 1 multiplexer. One can select any 2 variables (for example, AB or CD) as select inputs of one 4 to 1 multiplexer.
A metal plate is subjected to tensile stresses of sigma x = 21 ksi and sigma y = 17 ksi. The corresponding strains measured in the plate are Ex=920 µE and Ey=620µE. Determine Poisson's ration v and the elastic modulus E for the ..
Voltage that results in a base current of 10 mA peak.
A modulator transmits symbols, each of which has 64 different possible states, 15,000 times per second. Calculate the baud rate and the bit rate.
A charged 100- picoFarad capacitor has initial voltage across it of 10 V. A 100 kohm resistor is suddenly connected across the capacitor (at t=0) to discharge it. What is the magnitude of the instantaneous current at 20 usec
H(s) = ( 100 (s + 20) (s + 50) ) divided by ( ( s +8 ) ( s + 300 ) ( s + 5000 ) ) Determine the Bode magnitude and phase responses forH(s). Label all slopes and dB values.
A multi-frequency signal is input to a first-order, low-pass filter. A 60 kHzcomponent is found to be reduced in amplitude by a factor of 90. Find the break frequency of this filter. determine the factor of reduction for the 5 kHzcomponent.
g0 is the acceleration of gravity at the surface of the Earth, A is the altitude, and Re is the radius of the Earth, approximately 6,380 kilometers. What is the value of g at an altitude of 20 miles in unites of meters per second squared
The power supplied by a certain source is a constant 7.5 W over the first 5.8 min, zero for the next 2.8 min, a value that increases linearly from zero to 10 W during the next 8.8 min, and a value that decreases linearly from 10 W to zero
A medium wave antenna mast is 50 m high and is operating at 1 MHz with a top loading the effective height is equal to 45 meters. with input power = 100 Kw , find the input current given that the ground resistance = 2.5 ohm .
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