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Although the use of p.u. values may at first sight seem a rather indirect method of expression there are, in fact, great advantages. Give these advantages
Gold cost about $100 an ounce in 1971. In 2007, the cost of an ounce of gold is hovering around $800. compute the average price increase for gold.
An electrical energy source forces a constant current of 500(mA) through a light bulb for one hour. If 12.6(kJ) is given off in the form of light and heat energy, calculate the voltage drop across the bulb.Use Engineering Notation with 3 decimal p..
One kilowatt-hour is the amountof energy transferred by a 1 kW of power in a time period of 1hour. A power company billing statement reports a user'stotal energy to be 1489 kWh. Find the number of joules usedduring the billing period.
A silica fiber has an outer diameter of 125 micrometers. What is the total volume of silica for a 1km length? This fiber is wound on a spool whose unloaded diameter is 20 cm. The spool height is 10 cm. Compute the diameter of the fully loaded s..
1- If the diameter of a spherical water droplet is 100.0 µm, how much energy is required to increase the diameter of the water droplet by 3.0 µm The surface tension of water is 1.0 x 10-3 J/m2. 2- A metal crystallizes in a face-centered cubic lat..
How do we compute the complex power delivered to a circuit component? How are average power and reactive power related to complex power?
A digital communication system employs differentially encoded BPSK modulation scheme with non-coherent (differential) reception. If the Eb/N0 is 8 dB, what is the probability of bit error for the system
Calculate the energy required to change the arrival time of a near earth object of mass 10,000 MT by a distance equal to the diameter of Earth using laser ablation. Assume an ejection velocity of the material at 10,000 m/sec.
A tiny ball (mass = 0.015 kg) carries a charge of -20 µC. What electric field (magnitude and direction) is needed to cause the ball to float above the ground?
Find the appropriate subchannel modulation format (note: the number of constellation points in the modulation mapping scheme should be the power of two).
Consider a system that needs an 8-dB SIR for proper operation. How far do serving and interfering BSs have to be apart so that the MS has sufficient SIR 90% of the time at the cell boundary. Make a worst case estimate.
A permanent magnet DC motor with a 10 ohms armature is stopped by dynamic braking. at operating speed, the counter EMF in the motor armature is 15 volts. What will be the peak current through the switch at the instant it shorts out the motor
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