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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?
consumed from three phase network with phase to phase voltage 220 V an apparent power is (5+1.7) kVA .how big will be load's impedance for the one phase for scheme connected in the "star"
we have two light bulbs a and b. bulb a has an exponentially distributed lifetime with mean lifetime 4 days i.e la
A coil of wire having negligible resistance and an inductance of 0.248 henry is connected to a 117-volt 50-cycle source. Calculate (a) the inductive reactance, (b) the current, (c) the maximum power delivered to the inductor or returned to the sou..
Two charged particles, Q1 = +5.50 nC and Q2 = -3.40 nC, are separated by 39.0 cm. (a) What is the electrical potential energy of the pair (b) What is the electric potential at a point midway between the charged particles
Consider an electron with spin magnetic moment u_s in a strong magnetic field B_z in the z direction. The potential for an electron with spin magnetic moment u_s in a magnetic field B is V=-u_s . B
what are some good examples of test equipment that is available for use in diagnosing and repairing communications
what horsepower is added to water to pump it vertically through a 200-ft-long 1.0-in.-diameter drawn tubing at a rate
Assume a thermocouple generates a linear voltage from 20 mV to 50 mV when the temperature changes from 750 degrees F to 1250 degrees F. How much voltage will be generated when the temperature of the thermocouple is at 1000 degrees F
A lossless line having an air dielectric has a characteristic impedance of 100 Ohms. Another line that is identical in dimensions to the air line is fabricated with the air displaced by a dielectric material have an \(\epsilon_{r}\) value of 4.
Assume that the outputs are matched.
1. Consider the following voltage wave V(t) = 170 + cos(377)t volts what's the RMS value of this wave 2. What voltage will a DC voltmeter read if connected to an ideal voltage generator with the voltage of V(t) = 170 + cos(377)t.
What is the de Broglie wavelength of an electron at 150eV. what is the wavelength for electrons at 10keV, which istypical of electron microscopes. Comparing this to visiblel light,comment on the advantages of electron microscopes.
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