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Fuel Cell produces current by using H2. Anode reaction: H2-->2H+ + 2e- Cathode reaction: 4e- + 4H+ +O2 --> 2H2O. The rate at which Hydrogen enter the fuel cell is given as 5 L/min. The temperature is constant at 300K. Find molar flow rate of Hydrogen and H2O, and Current the fuel cell produces.
Suppose a signal is sampled at 1 kHz and you compute the DFT of the signal using 1000 signal samples. What frequency in Hz corresponds to the 150th value of the DFT
Use two different criteria for determining the effective bandwidth of e^(-t)u(t). Ad the bandwidth, use the frequency at which the amplitude response drops to 1% of its peak value (at w=0). Next use the 99% energy criterion for determine the band ..
A battery's lifetime was obtained as the time for the output to drop to 0.9 volt. The mean lifetime of these 152 batteries was 46.7 hours and the standard deviation was 13.3 hours. The industry standard for lifetime of such batteries is 45 hours.
A certain pn junction is operating with Vt=26mV and ni=1.08x10^10 electrons/cm^3. The doping concentrations are Na=2x10^15 cm^-3 and Nd=9x10^16cm^-3. The diffusion coefficient are Dn=34cm^2/s and Dp=12cm^2/s.
A three-phase, 345-kV, 60-Hz transposed line is composed of two ACSR 1,113,000, 45/7 Bluejay conductors per phase with flat horizontal spacing of 11 m. The conductors have a diameter of 3.195 cm and a GMR of 1.268 cm.
What is the memory layout of the 16-bit value, 0x7654 in a big-endian 16-bit machine.
The Bandwidth of a broadband signal is 6 MHz and it's maximum frequency is 106Mhz. What is the most likely carrier frequency. WHich of the follwing is not a fundamental characteristics determines the effectiveness of a communication system.
compute the power loss in a transmission line with a resistance of 0.05 ohms/mile. Compute the power loss if 500kW of power is transmitted from a power generating station to cities at distances of 20,30,40....100 miles at 100v and 200v.
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 solution to Power Factor, Two single-phase loads are connected in parallel across a 415 V, 50 Hz supply. One load is rated 130 kW at a power factor of 0.75
Water moves through a constricted pipe in steady, ideal flow. At the lower point the pressure is 1.69 105 Pa and the pipe radius is 2.80 cm. At another point 2.50 m higher, the pressure is 1.35 105 Pa and the pipe radius is 1.60 cm.
For an RC circuit with a time constant of 1.0ms and assuming switch was closed at t=0, i) What is the time for the voltage across resistor to equal 10% of its initial value ii) What is the time for the voltage acro..
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