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A single phase transformer rated 1.2kV/120V, 7.2kVA hasprimary-referred parameters Req= r1+ a r2= 1Ω andXeq = x1+ a2 x2 =4Ω when neglecting exciting current. At rated voltage itscore loss may be assumed to be 40W for all the load curent. (a) Determine theefficiency and regulation of the transformer when it delivers 7.2kVA at V2=120Vand power factor of 0.8 lagging. (b)Repeat (a) at powerfactor of 0.8 leading. (c)Determine maximumefficiency of the transformer at rated voltage and 0.8 powerfactor, and determine the kVA load level at which the maximum efficiencyoccurs.
In a certain balanced three-phase system, each line current is 5A and each line voltage is 220 V. What is the approximatereal power, if the power factor is 0.7
1- Find the voltage across the inductor for t > 0 2- Sketch the voltage and the current as a function of time 3- Find the power ( in microwatts) at the terminals of the inductor when t = 200 ms
If a patient is on a drip with a drip rate of f(t) = 150e^0.0167t mL/hr, calculate the amount of substance transferred into the patient over a time period of 10 hours, use time intervals of 1 hour. Compare
A 10-µF capacitor is charged to a potential of 100V. At time zero it is discharged through a 1-M ohm resistor. What is the time constant for this system
The problem has two parts(a and b) and it asks: Find the power and rms value of each of the following signals: a) x(t) = 5 + Ccos(ωot+θ) b) x(t) = 2+7cos(1/2t+θ1)+3cos(2/3t+θ2)+5cos(6t+θ3)
A 440 Vrms (line to line voltage) three phase induction motor runs at 1150 rpm driving a load requiring 15Nm of torque. The line current is 3.4 at a power factor of 80% lagging. Find the input power in Kw, The output power in Kw, and the efficiency..
A Y-connected load with an impedance of 12-j15 Ohms per phase is connected to a balanced Delta-connected 208V, 60Hz, three-phase, positive phase-sequence supply. Determine 1) the line and phase voltage, 2) the line and phase current
Consider a (Nt,Nr) =(4,4) MIMO channel. For the input of the channel x = [x1,x2,x3,x4] assume that each xi is drawn from a BPSK constellation with energy P. Also assume that the channel noise variance is σ2 =1
An equilateral glass prism w/ an index 1.42 has a beam of light incident on one face at an angle of θi to the normal. Determine the angle at which it emerges from an adjacent face of the prism.
Shuffle a deck of cards and pick two cards at random. Observe the sequence of the two cards in the order in which they were chosen. (a) How many outcomes are in the sample space
Given the following IIR system with zero initial conditions: y[n]=0.2 x[n]- 0.5y[n-1] -0.06y[n-2] a)find the first five samples of the impulse response b) find the first five step response
The electric field intensity of a linearly polarized uniform plane wave propagating in the +z direction in seawater is E= 100 cos(10^(7) pi*t) V/m at z = 0. constant of emissivity = 8.854 * 10^(-12) F/m
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