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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-Δ starter. If an induction motor is normally Δ -connected, it is possible to reduce its phase voltage VΦ (and hence its starting current) by simply re-connecting the stator windings in Y during starting, and then restoring the connections to Δ 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 Δ -connection during starting?
A finite state machine has one input (X) and two outputs (Z1 and Z2).An output Z1=1 occurs every time the input sequence 101 is observed,provided the sequence 011 has never been seen. An output Z2=1occursevery time the input 011 is observed.
A high-voltage transmission line connects a city to the power plant. It consists of two aluminum wires, each with resistance of 4.0 Ohm. The transmission line delivers to the city 1.7x105 kW of power at 2.3x105 V. What is the current in the transm..
What are the essential features of an ideal op amp? Identify the terminals of an op amp. Draw its equivalent circuit. Define virtual ground and what is difference amplifier? Draw its circuit. Define C.M.R.R.
A 3-element uniform linear array with inter-element spacing of λ/2 is operated as a broadside array ,find the directions of null radiation , find the direction and the relative level of the side lobe .
Explain in detail on the fabrication process of the FINFET. You must show a 3-dimensional view of FINFET and label the its L and W, the length and width of the gate.
Two voltage waves of equal amplitude, V0, and frequency w, propagate in the forward z direction in a lossless transmission line of characteristic impedence Z0. One waves is phase-shifted from the other by \o radians.
What RF bandwidth must the radio link provide if the modulation is binary phase shift keying (BPSK)?
A standard test for the operation of an FM system is to examine the output spectrum when modulated by a standard test tone. You're examining an FM broadcast tx modded by a 1kHz tone.
A 60 hertz, 3 phase transmission line has a toal seriesimpedance (Z) of (0.2 + j0.8) ohms per mile per phase and shunt admittance(Y) of (j5.31 E-6) mhos per mile per phase.It delivers 40MW at 220Kv ,with 90% poer factor lagging.
Determine the minimum bandwidth required to achieve a P(e) of 10^-4 for a 16-PSK system operating at 25 Mbps with a carrier-to-noise ratio of 10 dB
What is the input to our control system called - What would we expect its final value to be (the value as time approaches infinity) - Determine the equation that linearizes the sensors output between temperatures of 0oC and 100oC.
Discuss what is meant by the transient stability of a power system and what assumptions have you made for this study. Describe the procedure you need to carry out to determine the stability of the system.
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