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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.
gear box has ratio 8:1 to the .9-m diameter wheels. ARMATURE HAS SOURCE WHERE THE VOLTAGE CAN BE VARIED FROM 0 TO600--IGNORE ALL LOSSES. A) DETERMINED REQUIRED VALUE OF kφ to give a speedof 12.5 m/s at an armature V of 600Volts.
At what temperature do hydrogen molecules, H2, have the same rms speed as nitrogen molecules, N2, at 455C. At what temperature do hydrogen molecules have the same average kinetic energy.
Find the value of the constant such that the SNR at the output of the filter will be maximum. - what sampling time will the SNR at the output of the filter be maximized?
Define the term pulse reflection technique. - Show the diagram of it. -Label it clearly.
where V is given in meters per second, U is in degrees, and W is the percent grade of the road. Design a proportional control law U = -kp V that will maintain a velocity error of less than 1 m/sec in the presence of a constant 2% grade.
For the emitter bias network of Fig, determine:- IB, IC, VCE.- Given that ICQ = 2 mA and VCEQ = 10 V, determine R1 and RC for the network.
Determine the current I1 required to establish a flux of 2 x 10-4 Wb in the magnetic circuit of given figure.
A 10-uF capacitor has a voltage with the following time dependence:v(t)=20*[1-exp(-0.2*t)] in unit of Volt. Determine the current, power, and energy of the capacitor as a function of time
A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.
How to mitigate effects of very fast transients (VFT) on HV equipment ?
The energy stored in a 2H inductor is 400J and is decreasing at 200J/s at t=4 seconds. Determine the voltage magnitude and curent magnitude at t=4 seconds. Does the current enter or leave the positive terminal of the inductor.
Controlling interest rates is an example of
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