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A computer can be purchased by a consulting engineer for$46,000. She estimates a useful life for 6 years for thecomputer with a salvage value of $4000. A maintenance contractis available at a rate of $2,400 per year, and an operator will cost $15 per hour when the computer is in use. As, analternative, a computer service is available to the engineer to doall her computing at a rate of $24 per hour. Assuming interest at8% compounded anually and insurance at 6% of book value, determinethe annual usage in hours per year for which the two alternativesare equal. If annual usage is expected to be greater than this result, which of the alternatives is more favorable?
Assume the resistance of a human person was 500 ohms, if a person was struck by lightning with a peak voltage of 100,000 volts, what was the peak current that would flow through the person
Determine the transconductance in the saturation region for the n-channel MOSFET using the following paramters at room temperature.1. p type Si density = 2.8*10^15 /cm^3 2. Si intrinsic carrier concentration = 8.6*10^9 /cm^3 3. Metal-semiconductor ..
explain how you would modify a 4-bit adder circuit to turn it into an Adder/Subtractor circuit. Explain how your creation would do a subtraction operation. Use a circuit diagram to illustrate. For an Adder/subtractor that works with signed numbers
A new government law requires that the lead content of drinking water be less than 1.0 ppb. You are a safety engineer, and you have recently tested your companys drinking water using two methods. Method A gives a reading of 0.85 ppb
What is the maximum bandwidth of the low pass filters at the receiving end of the link? What bandwidth would you recommend for the LPFs?
Further suppose that the coins C1, C2, and C3 are biased such that the probabilities of a head occuring for coins C1, C2, and C3 are 0.9, 0.75, 0.60, respectivley, while the fourth coin C4 is a fair coin. A. If the ou..
Given the ratings of a single-phase transformer - 3kVA 220V/110V 50 Hz, calculate the rated current for the primary winding and the rated current for the secondary winding. The currents in the transformer should not exceed these values during the ..
Each of three coins has two sides, heads and tails. Represent the heads or tails status of each coin by a logical variable (A for the first coin, B for the second coin, and C for the third) where the logical variable is 1 for heads and 0 for tails..
An LVDT (Linear Variable Differential Transformer) is used in an accelerometer to measure seismic-mass displacement. The LVDT and signal-conditioning output is 0.31 mV/mm with a +/- 2 cm maximum core displacement.
The voltage between two charged parallel plates is 5 volts (the top plate has more negative potential). What energy is acquired by an electron that is moved from the bottom plate up to the top plate
a) If the parallel inductor is replaced with a single inductor, what would be the value of the inductor b) What would be the initial current through the equivalent inductor c) Find i_1(t) and i_2(t) and verify that they satisfy using the Kirchoff's C..
An electric kettle needs six minutes to boil 2 kg of water from the initial temperature of 20"C. The cost of electrical energy required for operation is 12 paise, the rate being 40 paise per kWh.
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