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Which is the best alternative to buying a machine assuming an interest rate of 4% and a time span of 6 years. Compare using Present Values.
A: Buy new machines for $25k. They earn $5k per year and their maintenance costs are $125 per year. The salvage value after 6 years is $10k.
B: Buy rebuilt machines for $15k. They earn $3k per year and their maintenance costs are $350 per year. The salvage value after 6 years is $4k.
Derive the transmission and reflection coefficients for the case of tunneling through a square potential barrier with 0
A signal consists of only two sinusoids, one of 45 Hz and one of 25 Hz. This signal is sampled at a rate of 160 Hz. Find the first six positive frequencies that will be present in the replicated spectrum.
In a certain communications system a resonant-tuned circuit (tuned at 1200 kHz with Bandwidth = 15 kHz) is connected to the output of a non-linear amplifier (mixer). Find the frequency components at the output of the resonant-tuned circuit
Efficiency in a power transformer is 98.6% when loaded such that its core losses equal the copper losses. Calculate the per unit resistance of this transformer.
Suppose a turbine is used for generating electricity, estimate the ratio of powers generated by the same speed water and air. (Water density=1g/cm3, air density =1.2kg/m3)
Write a Matlab program to calculate the electric field due to a line of charge of length 1m. a) Describe the line of charge as a collection of point charges centered on the z-axis. Calculate the electric scalar potential of that same line of charge.
1. What is the difference between On-delay and Off-delay timer instructions 2. How are timer instructions reset What happens when an On-delay timer reaches its preset delay time
Desired D.C. Output : 10 V Load Variation: 0.3 kilo-ohms - 10 kilo-ohms Ripple Factor: Less than 0.1% for 2 kilo-ohms load Load Regulation: Better than 3 mV for a 1 mA change in load current
A box contains balls that are identical except for color. Initially the box contains three blue and two green balls. A ball is drawn at random from the box and its color is observed. This first ball is then put back in the box, and then four balls..
A sinusoidal voltage has a maximum value of 100V, and the value is 10V at t=0. The period is T=1ms. Determine v(t)
A manufacturing plant has a 600V, 60Hz supply and the following loads: Lights: 24kW Electric furnace: 4.8 + j6.4%u03A9 with a current of 150A Motor loads, 160kW at 0.8 Power Factor, lagging.
Three identical single phase transformers, each rated at 100KVA, 7KV/3.5KV, are connected as a three phase transformer bank. The high-voltage side of the transformer is connected in delta and the low-voltage side is connected in wye.
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