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A molded plastic product (p = 1200 kg/m3 · c = 1500 J/kg · K, k = 0.30 W/m · K) is cooled by exposing one surface to an array of air jets, while the opposite surface is well insulated. The product may be approximated as a slab of thickness L = 60 mm, which is initially at a uniform temperature of T+ = 80°C. The air jets are at a temperature of T8 = 20°C and provide a uniform convection coefficient of h = 100 W/m2 · K at the cooled surface.
Using a finite-difference solution with a space increment of ?x = 6 mm, determine temperatures at the cooled and insulated surfaces after 1 hour of exposure to the gas jets.
What is specific application or product that might involve the z-transform and how is it relevant in the application or design of the application or porduct
Two transistors, fabricated with the same technology but having different junction areas, when operated at a base emitter voltage of 0.75V, have collector currents of 0.2mA and 5mA. A. Find Is for each device.
An alarm is powered by 120 VAC, and the on/off state of the alarm is controlled by an EM relay. Design the interface between a computer output port and the EM relay. The dropout voltage is 3.5 V, and the coil current needs at least 100 mA. Limit t..
a single phase 100 kVA, 1000/100 V transformer gives the following test results: Open Circuit test: 100V, 6.0 A and 400 W Short Circuit test: 50V, 100A and 1800W determine the rated current and voltage for high and low sides
In transformer designs, often you can find an air gap in the core. In all the electric machines, there is an air gap between the stator and rotor. In both cases, flux will go through both core material and the air gap.
Create a table of results and plot the angle vs tension in cable B. Assume that the cables are attached to the weights rather than a passing through loops attached to the weights
Calculate for this load (a) the slip (b) The stator copper loss (c) The total power input if the stator losses are 2000 W, (d) The efficiency (e) The line current (f) The number of complete cycles per minute of the rotor e.m.f.
2. What is the expected output frequency of a sample and hold system if fs= finput 3. Which is input frequencies will give an output frequency of 50 Hz when put through a sample and hold system if our sampling frequency is 488 Hz
The following test data were obtained from testing a 48kVA, 4800/240-V, step down transformer: Open-circuit test Voltage (V) 240 Current (A) 2 Power (W) 120 Short-circuit test Voltage (V) 150 Current (A)10 Current
Design a 2-stage voltage amplifier, the first stage a common-source and the second a source-follower. The load onthe S-F is 100 ohm, and the signal impedance is 1 K-ohm. The overall voltage gain should be -10 V/V. Use a single power supply, VDD = ..
Find the laplace transform of the following functions and the time-shifting property (if needed) of the unilateral Laplacetransform: u(t)-u(t-1)
A message signal 0.01e^(-5000*t^2) phase modulates a carrier signal 3 cos(240000 pi t) with a modulation constant 600*sqrt(e). (a) Determine the expression, the power, and the bandwidth of the modulated signal.
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