Engineering, 23.01.2020 19:31 thekid3176
X(t) denotes a zero-mean wss gaussian random process with autocorrelation function rx(t)-4sinc2(10%) 1. what is the power in this process? 2. determine the power spectral density, sx(f), for this process. 3. what is the bandwidth of this process? 4. assuming that this process passes through an ideal lowpass filter with a band- width of 5 khz and the output is denoted by y(t), determine sy(f), the power spectral density of y(t), and the total power in the output process. 5. determine the pdf of random variables x (0), x (10-4), and x (1.5 x 10-4). 6. show that random variables x (0) and x(10-4) are independent but x(0) and x(1.5 x 10-4) are dependent.
Answers: 3
Engineering, 04.07.2019 18:10
Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)
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Engineering, 04.07.2019 18:10
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
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Engineering, 04.07.2019 18:20
Have a greater impact on maintenance productivity than any other support group. (clo5) a)-the top management b)-inventory and purchasing c)-sub-contracting d)-cmms
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Engineering, 04.07.2019 18:20
A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?
Answers: 3
X(t) denotes a zero-mean wss gaussian random process with autocorrelation function rx(t)-4sinc2(10%)...
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