Engineering, 07.12.2019 02:31 autumnrose02
Consider an lti system defined by the difference equationy[n] = β2x[n] + 4x[n β 1] β 2x[n β 2].(a) determine the impulse response of this system.(b) determine the frequency response of this system. express your answer in the formh(e j w ) = a(ejw)eβjwnd .where a[ejw) is a real function of w. explicitly specify a(ejw) and the delay nd of this system.(c) sketch a plot of the magnitude |h(ejw)| and a plot of the phase 4h() suppose that the input to the system isx 1[n] = 1 + ej0.5nn β=o< n < co. use the frequency response function to determine the corresponding output y1[n].(e) now suppose that the input to the system isx 2[n] = (1 + ej0.5nn)u[n] βao< n < co. use the defining difference equation or discrete convolution to determine the corresponding output y2[n] for βao < n < co. compare y1[n] and y2[n]. they should be equal for certain values of n. over what range of values of n are they equal?
Answers: 1
Engineering, 04.07.2019 18:10
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
Answers: 3
Engineering, 04.07.2019 18:10
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 Β°f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
Answers: 3
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20Β°c. the pipe has an outer surface temperature of 65Β°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 18:10
Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.
Answers: 1
Consider an lti system defined by the difference equationy[n] = β2x[n] + 4x[n β 1] β 2x[n β 2].(a) d...
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