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A natural gas producing company is considering two engine systems for use in driving a small compressor. System A can be purchased for $120,000 and is expected to have a life of 4 years. Annual diesel fuel consumption is estimated to be 60 gallons per day of use. System B can be purchased for $150,000 and is expected to have a life of 4 years. Annual propane fuel consumption is estimated to be 40 gallons per day of use. Both engines have salvage values equal to 15% of initial cost and both will accomplish the needed requirements. Estimates of fuel costs for each system and expected days of use each year are as follows:
Assume that MARR is 8% and that all other costs besides fuel will be the same for both systems. Which system is the best economic choice?
Suppose the volume X occupied by a capacitor is A*d where A is the total area of the dielectric layers and d is the thickness of each dielectric layer (this assumes that the metal plates are infinitely thin).
Consider the best possible heat engine working in air at 25°C. The engine continuously converts heat from a source at 300°C to work, and heat is continuously transferred into the engine at a rate of 100 kJ/s.
In the case of a problem in the communication process in general (not just using Fieldbus), describe how you would troubleshoot a communications problem at the physical layer. Describe also the tools that you would use to troubleshoot the communic..
what are the advantages and disadvantages of using PLDs, including FPGAs, as compared to using discreet logic-integrated circuit chips
An analog signal consists of three sinusoids with frequencies3.1 KHz, 4.82 KHz, and 5.64 KHz. The signal is sampled at asampling rate of 32 KHz producing the Discrete signal x(n). Determine the normalized frequencies in x(n).
A 5-element uniform linear array with inter-element spacing of λ/2 is to have maximum radiation in the direction θ=60° , find the current phases , find the directions of null radiation , hence sketch the radiation pattern , find also the relative ..
The iron section was attached to the ceiling while the steel section was placed on a horizontal support so that 1-mm airgaps were left between the sections. The mass density of steel is7.8 g/cm3. The students consider triggering therelay using a c..
How are Zener diodes specified? Define the important specification factors for the device
A plant has two identical standby generator units for emergency power use. In the area of the generators, the normal noise level registers 81 dBA on the sound-level meter with the generators turned off. When one generator switches on, the noise le..
Find the worst-case dc output voltages of the inverting amplifier shown in Figure for vin = 0. The bias current ranges from 100 to 200 n A, the maximum offset current magnitude is 50 n A, and the maximum offset voltage magnitude is 4 mV.
A storage tank has a Diameter of 20ft and a height of 10ft. The output volumetric flow from this tank is given by fout(t)=2h(t) where h(t) is the height of the liquid in the tank. At a particular time the tank is at steady state with an input flow..
write a VHDL module for the parallel-in, parallel-out right-shift register of figure 12-10 (page 360), but add an active-low asynchronous clear signal ClrN. Do not use individual flip-flops in your code. simulate the module to obtain a timing diag..
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