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A 4 μF capacitor is charged to a p.d. of 400 V and then connected across an uncharged 2 μF capacitor. Calculate
(a) the original charge and energy stored in the 4 μF,
(b) the p.d. across, and energy stored in, the parallel combination.
how many different values may any base 9 digit have What is the highest value allowedf for any base 9 digit
Consider a bank of three single-phase two-winding transformer whose high-voltage terminals are connected to a three-phase, 13.8 kV feeder. The low-voltage terminals are connected to a three-phase substation load rated 2.4 MVA and 2.3 kV.
Describe the two spin echo methods (1.Hahn, 2. CPMG-Purcell et. al). Describe the role of p/2 and p pulses in each case and make a comparison and contrast. Give diagrams
Consider a SISO link with received signal α = hs + n, where h is a zero-mean complex Gaussian random varaible with unit variance, where the power of the data signal s is mathbbE (IsI2) = P, and where n is a zero-mean AWGN scalar with unit variance..
A radar antenna transmits 50 kW at 10 GHz. Assume transmission is in a narrow beam, 1 m2 in area, and that within the beam, waves are plane waves. The wave is re?ected from an aircraft but only 1 % of the power propagates in the direction of the a..
A torque T = 750 kN.m is applied to the hollow shaft shown that has a uniform 8-mm wall thickness. Neglecting the effect of stress concentrations, determine the shearing stress at points a and b.
A proportional controller for a rotating antenna has a gain Kp of 5 in-oz/deg. The antenna was initially pointing due south, but was then commanded to point southeast. What is the torque when the antenna gets to within 5o
Calculate the peak current and the apparent power supplied to the load.
A load consisting of a 480 ohm resistor in parallel with a (5/9) uF capacitor is connected across the terminals of a sinusoidal voltage source, vg, where vg=240cos5000t V. a) What is the peak value of the instantaneous power delivered by the source
Find the period of a periodic waveform whose frequency is 25 Hz, 35 MHz, 55 kHz, and 1 Hz.
How do you think the equilibrium in question 15 will change if cross-price elasticities of demand increase? How would you alter the equations to show such an increase? Can you compute the new equilibrium?
Which components in an analog filter determine its frequency-dependent behaviour and how can this be described?
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