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Consider a 3 phase, 2 pole induction machine. Neglect the stator windings resistance and the leakage inductance. The rated voltage is 208 V (line-line, rms) at 60 Hz. Lm=60 mH, and the peak flux density in the air gap is 0.85T. Consider that the phase-a voltage reaches its positive peak at ωt=0. Assuming that the rotor circuit is somehow open-circuited, calculate and draw the following space vectors at ωt=0 and ωt= 60 degrees: vs, is, and Bms. Draw the phasor diagram with Va and Ima. WHat is the relationship between Bms, Ims, and Im?
A magnetic flux of 400 microwebers passing through a coil of 1200 turns is reversed in 0.1 sec. Calculate the average value of the e.m.f induced in the coil.
Determine the transfer function for a second order band pass filter with specifications. Chebyschev type with 1 db ripple in the pass band Lower cutoff frequency = 100 radians/sec Upper cutoff frequency = 169 radians/sec Pass band gain = 1
You also do not need to consider radiation heat transger in the calculations. However, you should consider how the resuts for the no-fin cases might change if radiation heat transfer is included in the analysis Calculate the circuit board temperat..
a. What are the cyclic frequency (in Hz) and period of this signal b. Express this signal in the Quadrature and Sine/Angle forms. c. Express this signal in terms of complex exponentials (hint - use Euler's identity equation).
A thin ,non conducting line of charge lies along the x axis. One end is at x=-1.00m and the other end is at x=+1.00m. The total charge on the line is 5.00 µC. calculate the vector (magnitude and direction) of the electric field E at point P due to ..
Each of the capacitance units is built of 4 similar 100V capacitors. Determine the capacitance of each capacitor.
The motor driven by a switch-mode dc-dc converter, which has a bus voltage of 200V. The switching frequency fs = 25 kHz. Calculate and plot the waveforms for va(t), ea(t), ia(t), and id(t) under the following conditions
A transformer on no load takes 4.5 A at a power factor of 0.25 lagging when connected to a 120V, 60Hz supply, the number of turns of the primary winding is 250. Calculate the magnetizing current, core losses and the maximum value of flux in the co..
The coils on the rotor, 10 turns per coil, are connected in series through the slip rings so that at any instance of time there are 5 coil sides under each pole. What is the dc voltage from a full wave rectifier if this rotates at 1000 rpm
How does a squirrel cage induction machine differ from a wound rotor induction machine What are the advantages and disadvantages of each as a motor and as a generator
A 500 line/mm diffraction grating is illuminated by light of wavelength 510 nm. How many bright fringes are seen on a 2.0 m wide screen located 2.0 m behind the grating
If a single stage amplifier is having an open loop voltage gain of 80, input resistance of 800 -ohm and output resistance of 200 -ohm, what will be the available signal voltage across a 50 -ohm load connected at the output
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