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A three phase 12 pole, 220-V, 60- hz ,50 hp squirrel cagemotor , operating at rated load, has a speed of 595 r/min, anefficiency of 89 percent ,and a power factor of 81 percent lagging.The locked rotor current and locked rotor torque at a rated voltage and rated frequency are 725A and 120 percent rated torque,respectivtively. Determinea) rated line currentb)rated torquec) minimum voltage required to obtain a blocked- rotor torque equal 70 percent rated torqued) auto transformer bank ratio required to provide the minimumvoltage in (c)e)stator current at blocked rotor with auto transformer incircuit;f) corresponding input current to the transformer when starting the motor at the voltage in (c)
A CG amplifier is specified to have Cgs=2pF, Cgd=0.1 pF, CL=2 pF, gm=4 mA/V, Rsig = 1k-ohm, and R'L = 20 k-ohm. Neglecting the effects of ro, find the low-frequency gain vo/vsig, the frequencies of the poles fP1 and fP2
Define Root Locus and Routh-Hurwitrz, Use Routh-Hurwitz to find vales of K so that L = k (s+1) / (s^2 +4) (s+10) has poles to the left of s= -2
While both triangular and sawtooth waveforms work in a PWM modulator, it does affect the phase of the PWM output and being able to control this can be useful. Consider your resistor and capacitor choices for the 555 timer circuit.
a laser weapon is fired many times at a circular target that is 1m in diameter and it is found that one-tenth of the shots miss the target entirely. for those shots that miss the target completely
Digital Communications, Order the following modulation types in terms of spectral efficiency (best to worse) and explain
An electric flux of 151 Nm2/C passes through a flat horizontal surface that has an area of 0.715 m2. The flux is due to a uniform electric field. What is the magnitude of the electric field if the field points 10.3° above the horizontal
Consider putting down a metal electrode with a 4.50 eV work function on a piece of Ge which has an electron affinity of 4.00 eV, an intrinsic carrier concentration at 300K of 2.5 x 1013/cm3, and that is doped with 1.0 x 1016 donors/cm3.
Design the circuit to establish a dc emitter current of 1mA and provide the highest possible voltage gain while allowing for a maximum signal swing at the collector of +-2V. Use +10V and -5V power supplies.
Explain how to find a causal, stable LTI system with rational Laplace transform G(s), such that, at least,the magnitude frequency response of H(s) is inverted; i.e.,|G(jω)| = |H(jω)-1|. Hint First show that H(s) can befactored into a series combin..
A system samples a sinusoid of frequency 480 Hz at a rate of 100 Hz and writes the sampled signal to its output without further modification. Determine the frequency that the sampling system will generate in its output.
Design a 0-1-2-3-0 counter circuit using flip flops. Flip flop A (most significant bit) is to be a T flip flop and Flip Flop B (leats significant bit) is to be a D flip flop.
Design a microstrip transmission line with Z0 =100 ohm that will be etched onto a sielectric substrate with er = 3 and a thickness of 4 mm. what should be the width of the microstrip line
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