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Question -
(i) A star-connected, three-phase synchronous induction motor takes a current of 10 amps from a 415 volt supply at unity power factor when supplying a steady load. If the synchronous reactance is 5 ohms/phase and the resistance is negligible, draw the phasor diagram and calculate the value of the generated emf and the load angle.
(ii) If the excitation is reduced by 10% and, as a consequence the generated e.m.f. is reduced by 10%, calculate the new value of the generated e.m.f E, the stator current, the power factor and the load angle, assuming that the load does not change.
(iii) Comment very briefly on the effect that reducing the excitation has on the power factor, stator current and the load angle.
Application: Electrostatic precipitator. The designers of the precipitator in Problem 5.34 found that they cannot make two half-shells as needed, but they can make the precipitator of four quarter shells and connect them as shown in Figure 5.55. A..
Design a PD controller with a 140% PB and a 0.2-min derivative time. The fastest signal speed is 1 min. Measurement range is 0.4 to 2 V, and the output is 0 to 10 V.
[Hint: As you should explain, this is equivalent to showing that the sum of two forward light-like vectors is forward time-like, unless the spatial parts are parallel.]
Compare the experimental saturation magnetization, Mso (Table 15.1 third column), with the magnetic moment, 11m, at 0 K for ferromagnetic metals (Table 16.1). What do you notice? Estimate the degree of d-band filling for iron and cobalt.
For the differential amplifier shown in Fig. 4-8, R1 and R2 are 1% resistors with values of 4.7 k Ω and 270 k Ω, respectively.
Distinguish between a push-based and a pull-based model of supply chain management and explain how contemporary supply chain management systems facilitate a pull-based model.
Working with wired rifle microphones and radio microphones, The theatre's concerns when changing of wired rifle microphones to a radio microphone system are
Consider the message signal m(t) = 20 cos(2πt) and the carrier signal c(t) = 50 cos(100πt). Write down the AM signal, and sketch the resulting AM signal waveform for 75 percent modulation.
need the coding for the circuits and its a intelligent fan controller based on
If Nand gates are used throughoutand a ripple-carry design is used, calculate the delay through the adder, assuming all inputs are presented at the same instant, and counting D seconds per gate. Which output signal suers the worst delay.
Design a differential amplifier using BJT's to provide a differential gain of 65. The bias current source should be 2.5 mA. Follow the fully differential amplifier with a differential input single ended output amplifier with an additional gain of ..
Using the definition, compute the bilateral Laplace transform, including the region of convergence (ROC)
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