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A 600 V, 6-pole, 3-phase, 50 Hz, star-connected synchronous motor has a resis tance and synchronous reactance of 0.4 Ω and 7 Ω respectively. It takes a current of 15 A at upf when operating with a certain field current. With the field current remaining constant, the load torque is increased until the motor draws a current of 50 A. Find the torque (gross) developed and the new power factor.
Then find the phase relation between the total voltage and current; is it leading or lagging when the frequency is below resonance and above resonance; what is the nature of the circuit in those two regions(capacitive or inductive).
An AM modulator is operation with an index of 0.4. The modulation input is: m(t) = 4cos (3πfmt) + 2cos (5πfmt) + 4cos (7πfmt) What is the efficiency of the modulator Sketch the spectrum of the modulator output showing the weights of all impulse funct..
Can the same circuit analysis techniques used for resistive circuits with DC sources be used when the sources are sinusoidal Why
An 8 - bit microcontroller has an external RAM with the memory map from 8000H to 9FFFH. what is The Number of bytes this RAM can store
Two IIR filter coefficients are given below, respectively, IIR system 1: Numerator coefficients: bBP = [0.0201 0.0000 -0.0402 0.0000 0.0201 ]; Denominator coefficients: aBP = [1.0000 -2.1192 2.6952 -1.6924 0.6414 ]; IIR system 2: Numerator coefficien..
A Si sample contains 1016 cm-3 In acceptoratoms and a certain number of shallow donors. The In acceptorlevel is 0.16eV above Ev, and EF is 0.26eVabove Ev at 300K. How many (cm-3) In atoms are un-ionized (i.e., neutral)
Consider a delta connection of resistors and its equivalent star connection as shown in the attached picture below . If all elements of the delta connection are scaled by a factor K, K > O, the elements of the corresponding star equivalent will be sc..
A shopper in a supermarket pushes a cart with a force of 37 N directed at an angle of 25° below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed.
An op amp having a single pole roll-off at 100 Hz and a low frequency gain of 105 is operated in a feedback loop with ß= .01. what is the factor by which feedback shifts the pole. to what frequency. If ß is changed to a value that results in a clo..
A tidal energy system has an average tidal range of 5 m and a basin area of 21.5km^2. The system is designed to generate power during both incoming and outgoing tides. The seawater density 1025kg/m^3, and the tidal period is about 12.5 hours.
(1) If the frequency was changed, what would happen to the current in a circuit Explain increase or decrease. (2) If you have R = 2 K ohm, Xc = 3 K ohm, XI = 4 K ohm . Find the G, Bc, BI, Yt anf Zt.
If three wattmeters are arranged to measure the power in each line, calculate the reading of each meter.
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