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(1) A synchronous alternator is supplying 0.9 p.u. power to the grid when a temporary three-phase short occurs on the interconnector. The power angle curves are:-
Pre-fault = 2.0 sin(delta)During fault = 0.5 sin(delta)Post-fault = 1.4 sin(delta)Calculate the critical clearing angle.
(2) A 400-km, 500 kV three-phase transmission line has a series impedance of z = 0.03 + j 0.35 ohms/km and a shunt admittance of y = j 4.4 x 10-6 S/km. Using the equivalent pi circuit calculate the sending end voltage, current and power factor when the line is delivering 1000 MW at unity power factor.
Repeat the calculation using nominal pi circuit and compare and comment upon the difference of the two calculations.
Discuss linearity, time-invariance and causality of the following systems
The input impedance of a JFET used in COMMON SOURCE configuration, is defined by two considerations: The JFET itself has a VERY HIGH INPUT IMPEDANCE, because the input is the GATE to SOURCE junction that is REVERSE biased
What is meant by the net right-lateral differential of the x- and y-components of a vector normal to the z-direction?
Calculate the minimum value of Vd if the power flow through the converter is 5 kW (a) from the ac to the dc side and (b) from the dc to the ac side.
Two point charges, Q1 =30 C and Q2 =-100 C,are located at (2,0,5) m and (-1,0,-2) m, respectively. Find the force on Q1 and Q2.
Using singularity functions, write the equations defining the shear and bending moment for the beam and loading shown.
Derive the conversion factor between r (CM⋅Ω/ft) and r (Ω⋅cm) by - Solving for ρ for the wire of Figure in CM⋅ Ω/ft.
a 230-V shunt motor, having an armature resistance of 0.05 and a filed resistance of 75, draws a line current of 7 A while running light at 1120 rpm. the line current at a given load is 46
Sketch the waveforms for Vcont and VLPF and determine the total change in Vcont, VLPF, the output frequency, and the input-output phase difference.
In step four of this problem, how do you know in which direction to simplify the resistance for the thevenin resistance. (since you come up with a different answer depending on which direction you choose to simplify from)
If a communication is unicast, how can we use RSVP, which is designed for multicast in IntServ?
A new government law requires that the lead content of drinking water be less than 1.0 ppb. You are a safety engineer, and you have recently tested your companys drinking water using two methods. Method A gives a reading of 0.85 ppb
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