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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.
A 2,000-hp, unity power factor, three-phase, Y-connected, 2,300-V, 30-pole, 60-Hz syn chronous motor has a synchronous reactance of 1.95 Ω per phase. Neglect all losses. Find the maximum power and torque.
A temperature sensor produces 10 mV for each degree Fahrenheit. Determine the error in temperature reading if 20 mV of noise is added to the sensor output signal when the temperature is 70 degrees.
Elaborate the statement that an unloaded synchronous motor can be made to act as a capacitor or as an inductor.
A proportional control system is to be used to control the wing flaps of a jet air-plane. The wind load is expected to cause as much as 600 in .lb of torque. The system should be able to keep the flaps to within 5 of the set point.
The formula for the carry bit
Using a 4-bit synchronous counter and an AND gate, construct a counter that counts from 0000 through 1010. Repeat for a count from 0000 through 1110. Minimize the number of inputs to the AND gate.
A simple relay has an air gap of length 1.0mm and effective cross-sectional area of 1000mm2. The magnetising coilconsists of 1000 turns of wire carrying current of 200mA. Calculate the energy stored in the air gap.
A 100-Ohm lossless transmission line is to be matched to a load with impedance ZL = 120 - j80 Ohm using a short-circuited stub. Use the Smith chart to determine: (a) the standing wave ratio, (b) the shortest distance from the load to the location ..
The maximum flux density in the core of a 250/ 3000 volts, 50 Hz single phase transformer is 1.2 Wb/m2. if the emf per turn is 8 volt, determine (i) primary nad secondary turns (ii) area of the core
In transform coding, when a sender transmits the M matrix to a receiver, does the sender need to send the T matrix used in calculation? Explain.
Modify the state diagram branching conditions in the diagrams below as needed to ensure the sum and exclusion rules are obeyed in each case.
Find the armature current.
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