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1. When is it meaningful to attribute a group velocity to a signal comprised of more than two frequencies? Why?
2. Discuss the propagation of a narrow-band amplitude modulated signal in a dispersive channel.
3. Discuss the nomenclature associated with the modes of propagation in a rectangular waveguide.
The exponential Fourier series coecients for a signal x(t) are: ak= { 1.57 when k=0, 0 when k is even and k doesnt equal 0, ((-1)(k-1)/2)/k when k is odd} Determine the following: (a) Plot the spectrum of the Fourier series.
This will require two transformations from rectangular coordinates, one in the spatial domain and one in the frequency domain. There are two key transformations. Explain. Hint: This problem involves Bessel functions of the first kindof orders zero ..
Find the transfer functions, identify the filter as high or low pass and draw the bode plots.
An archaeologist finds the 14C in a sample of 3.0 g of material to be decaying at 107 counts per second. A modern 1.0 g sample of the same material decays at 151 counts per second. The half-life of 14C is 5730 years
Communication Channel A particularly interesting communication channel can be modeled as a linear, time-invariant system. When the transmitted signal x (t) is a pulse, the received signal r (t) is as shown (Figure 2.22).
Select two different applications that use electrical wiring.
Explain The Automatic Transfer System in Details Including the following : The Role of the Automatic Transfer SystemExample System DescriptionModes of Operation
A chopper is used to control the power flow from a dc source voltage of 125-V to a battery whose voltage is 240-V. The power transferred is 60 kW. Determine the duty cycle and the average input current.
The power transferred across the air gap of a two-pole induction motor is 24kW. If the electromagnetic power developed is 22kW, find the slip. Calculate the output torque, if the rotational loss at this slip is 400W
What are the rated current and internal generated voltage of this generator? What field current does this generator require to operate at the rated voltage, current, and power factor?
Using the LM555 data sheet, make an estimate of the maximum fundamental operating frequency in the astable mode.
Assume the intruder has intercepted the following ciphertext and the most common character in an English plaintext is the character "e". Use this knowledge to find the key of the cipher and decrypt the ciphertext.
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