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Consider a l0-plate fuel cell stack at an anode stoichiometry of 1.2 with 20 A current generated in the stack and a stack voltage of 6.0 V. As an engineer, you have a choice to install a recirculation pump to recycle the unused hydrogen from the anode exhaust back into the anode to increase the effective fuel utilization to 100%. However, the pump requires 60 W of parasitic power to operate continuously. Is installation of the pump justified? Explain. At what value of parasitic power does the addition of the pump become unjustified?
The voltage across a certain load is V = 1200√2
How tall must the antennas be if the link operates on a frequency of 2.450Ghz, D1=5miles, D2=11miles, and the obstruction is 60 feet high?
determine whether the statements are valid or invalid. If a statement is valid, please give a proof as in problem 1. If a statement is invalid, you need only provide a counterexample. If x + y = x + z, then y = z
A battery E (e.m.f 12v and internal resistance 0.8 ohms) and a resistor R1 (10 ohms) are connected in series across two parallel resistors (R2 = 12 ohms, R3 = 18 ohms). i) Draw the circuit diagram, determine the battery terminal voltage.
Six input voltage sources (V1, V2, V3, V4, V5, V6) have a +/- 1 V range. Design a circuit to produce Vout as the most negative (smallest) of (V1 + 2V2), (V3 - 2V4), (-V5 - 2V6). Your design should specify exact components. Note that diode drop can..
What is the effective data rate of this transfer (not counting the time for reading or writing the DVDs)?
Supply the quantisation levels (including zero) that are available. Do this for both the three and 4-bit ADC in table form. What is the resolution of each quantizer?
consider the back to back cascade of an ideal C to D and D to C converter. Both have the same sampling rate fs. Suppose that the signal being sampled is: x(t) = cos(324*pi*t - pi/4) + cos(80*pi*t - pi/4)
For a 64-PSK modulator with an input data rate(fb) equal to 36 Mbps and a carrier frequency of 100 MHz. A. Determine the minimum double-sided Nyquist bandwidth(fN) and the baud. B. Sketch the output spectrum.
The speed of a 10HP, 230V, 1200 rpm separately excited DC motor is controlled by a 1-phase full-wave bridge converter. The rated armature current of the motor is 10 A. The armature resistance is 0.25 Ohm and the armature inductance is 10 mH.
Calculate the following for this circuit: PR1 W PR2 W PR3 W PR4 W PD = PR1 + PR2 + PR3 + PR4 W 6. Verify that the total power dissipated in the resistors, PD is equal to the power supplied by the DC source, PS.
Design a 2-bit counter that, when f = 1, counts in the repeating sequence: 0, 2, 3, and when f = 0, counts in the reverse direction. Use T flip-flops. (a) Construct a state diagram or state table.
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