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1. (a) A sine wave at frequency f= 90 Hz is sampled digitally at sampling frequencies fs=200,160 and 50 Hz respectively. For each case, discuss whether there is aliasing. Also for each case, calculate the aliasing (perceived) frequency.(b) Using EXCEL (or Matlab or any other computer program) generate a sine wave at 90 Hz, DC offset =1.0 V, and amplitude = 2.2 V. Plot a smooth curve representing the real signal. Plot the time axis from 0 to 0.2 seconds, and the vertical axis from -2 to 4 V. On the same plot, plot the digitally acquired data (at 50 Hz sampling frequency) as symbols connected by straight line segments. Calculate the observed frequency from your plot and compare with the frequency calculated in part (a) and discuss briefly.
2. The signal-to-noise ratio SNR is defined as SNR=20log(Vsignal/Vnoise).(a) Calculate the signal-to-noise ratio SNR of an 80 Hz electrical signal with amplitude 2.00 V containing noise at 3600 Hz with amplitude 0.150 V.(b) In order to reduce the noise level the signal is filtered using a 2nd-order low-pass filter with a cutoff frequency of 100 Hz. Calculate the signal-to-noise ratio (SNR) with the filter and compare with part "a".Does the filter significantly improve the SNR?
a heat pump with refrigerant-134 as the working fluid is used to keep a space at 25 celsius by absorbing heat from
consider the 1-d steady state conduction in a plane wall. the heat flux qx through the wall must be constant. the wall
determine the power required for a 2500 kg car to climb a 60 m long uphill road with a slope of 15ordm from the
air at mass flow rate of 10 kgs at 1 atm 300 k point1 enters an adiabatic compressor and exists at 8 atm 600 k point 2.
1. Assuming that the most significant bit is the sign bit, find the decimal value of the following sign-magnitude form 8-bit binary numbers: a. 11111000 b. 10011111 c. 01111001 2. Find the sign-magnitude form binary representation of the fol..
three seconds after a polisher is started from rest small tufts of fleece from along the circumference of the
A commercial heat pump has energy in to the system at a rate of 60 kW from a thermal reservoir. If the power input from an electric motor is 15 kW, (a) determine the power (kW) delivered to the office area. (b) Determine the coefficient of perform..
a wheel can be modeled as a thin ring having mass 10 kg and four spokes made of slender rods each of mass 2 kg. the
sterilization is a batch process by which bacteria and molds in food are killed by heat treatment. a can of vegetables
A flat surface 4m wide and 10m long is exposed to air flow parrallel to its long side. The speed of the air is 55 km/h and the temperature is 5C. If the temp of the surface is constant at 12C, calculate the heat loss from the surface. Air properties ..
the pressure tap on the surface of a heat exchanger tube is connected via flexible tubing to a pressure transducer.
Dislocations are line defects that can be looked as extra half planes inserted into the crystal lattice. Point defects can be defined as edge and screw dislocations
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