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1. A 220 V, 50 Hz, 2-pulse, full wave, single-phase to three-phase cycloconverter is used to control an induction motor as reversible drive in the frequency range from 1 Hz to 6 Hz with constant torque control. If at particular operating condition load power factor is 0.88 and input displacement factor 0.70 then calculate (a) range of firing angle control, (b) highest value of input power factor and corresponding firing angle, (c) lowest value of input power factor and corresponding firing angle, (d) highest values of distortion factor and the its instant, (e) lowest values of distortion factor and the its instant.
2. 1 kW heating element of a 230 V, 50 Hz electric stove is to be controlled by a triac circuit. The gate circuit of the triac uses a 0.2 mF capacitor and a diac with a break over voltage of 50 V. Calculate the adjustable resistance value to provide control down to an rms voltage of 40 V.
A sinusoidal voltage has a maximum value of 100V, and the value is 10V at t=0. The period is T=1ms. Determine v(t)
how does your answer change if the bubble is elongated in the direction of the electric field and sphere and the dielectric shell are placed in an initially uniform electric field E 0 in the z direction.
What is the BER at the output of the receiver in clear air conditions, and the average time between errors? Give your answer in years, days, or hours as appropriate. Assume an implementation margin of 0.5 dB.
You have a 10 nH inductor. What value of capacitor should you put in series with the inductor to achieve an impedance of Z=j50 ohm at f=1.0 GHz
A three-phase overhead transmission line has a per-phase resistance of 0.15 ohm/km, and a per-phase inductance of 1.3263 mH/km.
placing the compensator or zero such that it will cancel the open-loop pole at -1. For both compensators you design, show the corresponding closed-loop transfer functions and compare the transient responses (P.O. and Ts).
A 200 resistor, a 10 mH inductor and a 4.7 µF capacitor are connected in a series circuit. a. Is the circuit overdamped, underdamped, or critically damped b. Write the characteristic equation and find the poles of this circuit.
Explain the operation of sequential logic devices and evaluate the output waveform in relation to the clock for QA, QB and QC in the subsequent circuit and show the binary sequence represented by these waveforms
A 150 MVA, 24 kV, 123% three-phase synchronous generator supplies a large network. The network voltage is 27 kV. The generator operates with an induced voltage, which is twice the rated line-to-neutral voltage.
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.
Will the electric field inside change (how much if yes)? Will the stored energy in the capacitor change (how much if yes)?
A 75 lossless line is terminated in error with a 93 resistor. A generator sends 100 mW down the line. (a) What is the SWR on the line (b) What is the reflection coefficient
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