Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 30, Problem 4SQ
To determine
Explain the process of connecting solid-state controllers into existing electromagnetic starters.
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Determine the figure of merit for both DSB AM and FM, provided that the modulating signal is a single-tone signal.
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Electric Motor Control
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- + Preemphasis LHS R signal L RHS signal Frequency doubler Pilot tone (a) + Preemphasis Composite baseband spectrum L+R Pilot tone L-R (DSB-SC) + FM modulator f (kHz) (b) 15 19 23 38 53 Lowpass filter Deemphasis + L Audio amplifier FM discriminator Narrowband filter Frequency doubler Bandpass R Audio ✗ Deemphasis + filter amplifier (c) and (c) FM stereo receiver. FIGURE A.25 FM stereo broadcasting: (a) FM stereo transmitter, (b) spectrum of FM stereo signal,arrow_forward4-3) Similar to Lathi & Ding, Prob. P.4.2-3 For a DSB-SC signal g(t) = 2m(t)cos(4000) transmitting each of the following messages, (a) write an expression for G(f) and (b) sketch the magnitude spectrum |G(f)], specifying the FWHM (full width at half-maximum) of any spectrum peaks. a) m(t) = sinc²(100-50л) b) m(t)=400e-80,000r²arrow_forward4-2) Lathi & Ding, similar to problem 3.8-5. For the filter shown below, with an input signal whose PSD is given by S⭑(f) = П(0.25лf): (a) Find the total input power; (b) Find the transfer function H(f); (c) Find the power spectral density (PSD) of the output signal; (d) Find the total output power of the signal 500 ΚΩ d 1 µF dt y(t)arrow_forward
- 4-1) Distortionless transmission A bandpass signal g(t) of bandwidth B = 2000 Hz centered at f= 5.0x104 Hz is passed through the RC filter below with RC = 4.0x105 radians/s. If over the passband, a variation of less than 2% in both amplitude response and time delay is considered to be distortionless transmission, would g(t) be transmitted without distortion? Find the approximate magnitude response and the approximate time delay for the signal. R w g(1) y(t)arrow_forwardFundamentals Of Energy Systems THQ1 Q6arrow_forwardA single phase has two group A and B, 50 Hz, overhead line system has radius of conductor 0.5 cm. alculate the total inductance of the line. a2 a1 6 cm 2 m 3m b₂ m B b₁arrow_forward
- A single phase has two group of conductors A & B; where A consists of 3- sub conductors (a, b, c) each of its have a radius of 0.25 cm, and the group B consists of two sub conductors (d, e) each of its have a radius of 0.5 cm. Calculate the inductance of the total system where the distance between the sub conductors is as below. 9m 6m 6m ୦୩ Group A Group Barrow_forwardFundamentals Of Energy Systems THQ1 Q8arrow_forwardFundamentals Of Energy Systems THQ1 Q7arrow_forward
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