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In this chapter, we learned that a step-down autotransformer could be used to reduce the starting current drawn by an induction motor. While this technique works, an autotransformer is relatively expensive. A much less expensive way to reduce the starting current is to use a device called Y-D starter (described earlier in this chapter). If an induction motor is normally D-connected, it is possible to reduce its phase voltage Vf (and hence its starting current) by simply re-connecting the stator windings in Y during starting, and then restoring the connections to D when the motor comes up to speed. Answer the following questions about this type of starter.
(a) How would the phase voltage at starting compare with the phase voltage under normal running conditions?
(b) How would the starting current of the Y-connected motor compare to the starting current if the motor remained in a D-connection during starting?
assuming a unilateral device. Use these results to find the equivalent circuit parameters for the HEMT device whose scattering parameters are given in Table 11.7, at a frequency of 2.0 GHz. Ignore S12.
Design a human body temperature indicator system for a hospital bed. Your system takes an 8-bit input representing a person's body temperature,which can range from 0 to 255. If the measured temperature is 95 or less, set output A to 1.
The real and imaginary parts of the product are similarly represented, but with 8 prebinary-point and 24 post-binary-point bits. The complex multiplier is subject to constraints that strongly limit the circuit area.
A particular signal source produces an output of 30 mV when loaded by a 100-k ohm resistor and 10 mV when loaded by a 10-k ohm resistor. calculate the thevenin voltage, Norton current, and source resistance.
consider a 3λ/4 linear wire antenna which is fed at the center,find : i- the current distribution on the wire. ii- for the input current of .7 Amp, find the loop current (I0) , and the maximum radiated E at r = 1000 m
A sinusoidal voltage of peak value 169.9 is applied to a load Z=16-j9. a)What is the peak active power delivered to the load b) What is the value of the average active power delivered to the load
Consider the function F = x · y + x(not) · z. a) Expand the function to its canonical or standard sum of products (SOP) form. b) Express the function in its canonical or standard product of sums (POS) form.
Discuss why the primary of a power transformer would have excessive current if the secondary were short-circuited. Why would there be no voltage across the secondary if the primary is open
An interplanetary spacecraft far beyond Earth's orbit communicates with an equatorial ground station on the Earth. Calculate the maximum Doppler shift seen at X-band (8.4 GHz) due just to the Earth's revolution around the Sun and Earth's rotation ..
Design a sine wave oscillator using the op-amp that provides the output signal with amplitude of 4V to 6.5V and a frequency of 1kHz.
Draw a functional block diagram of the light-pupil system indicating the input, output, and intermediate signals; the sensor; the controller; and the actuator.
Compute the rectangular form of the four-point DFT of the following signal, which is zero for n =4. Compute the inverse DTFT of: X(ω)=sinΩ cosΩ
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