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To maintain a freezer box at -40°C on a summer day when the ambient temperature is 27°C, heat is removed at the rate of 1.25 kW. What is the maximum possible coefficient of performance of the freezer, and what is the minimum power that must be supplied to the freezer?
A box contains balls that are identical except for color. Initially the box contains three blue and two green balls. A ball is drawn at random from the box and its color is observed. This first ball is then put back in the box, and then four balls..
The signal given is x(t) =cos(440*2*pi*t) +cos(554*2*pi*t)+cos(659*2*pi*t) Find the complex exponential forier series of the signal and plot k vs Ck for k=-1000 to 1000.
assuming XTAL=11.0592 MHz,write a program to genrate a square wave of 20 Hz frequency on pin2.3?
A three phase, 25-hp, 440-V, 60-Hz, 1750 rpm, wound-rotor induction motor has the following equivalent circuit parameters:R1=0.20 ohms, X1=1.0 ohms, R2=0.15 ohms, X2=0.8 ohms, Xm=30 ohms The motor is connected to a three phase, 440-V, 60-Hz supply.
If it takes 3.52 s for 10.0 mL of helium to effuse through a hole in a container at a particular temperature and pressure, how long would it take for 10.0 mL of oxygen, O2, to effuse from the same container at the same temperature and pressure
consider the following two first-order transfer functions H1 (z) = z + b/z + a , a = 0.3, b = - 0.4 H2(z) = bz + 1/z + a , a = 0.3, b = - 0.4 (a) draw the pole-zero plot for both transfer function H1(z) and H2(z)
a meter stick of uniform mass distribution and a mass of 0.150-kg is arranged as follows; a fulcrum is placed under the stick at the 20-cm mark on the stick. A mass of 0.100-kg is suspended from the 90-cm mark.
A 50-Ohm line is terminated by a (60 +j60) Ohm load. An adjustable shorted shunt stub is placed 0.23 Lambda from the load. What is the smallest standing wave ration that can be achieved between the generator and the line by adjustment of the stub ..
The power transfer in a transmission line is governed by the equation P = VS * VR * sin\(\delta\)/X line. Basedon this equation what is the maximum power transfer that can be achieved, and what is its value if VS =VR = 1.0p.u
Telephone signals are typically sampled at 8000 Hz. a. What is the time interval between samples b. What is the highest frequency that can be recovered from a sampled signal
Construct a 4-to-16-line decoder with five 2-to-4-line decoders (74LS139A). Use a block diagram for components and clearly show your address select variables.
Let x(t) = cos(3/4(t+1/2)+1/4) a. Determine the frequency, the period of x(t) b. Given another signal, y(t)= sin(3/4(t+1)+3/8), is y(t) identical to x(t) Why
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