Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 33, Problem 6SQ
When is it most important to use decelerating relays for multispeed installations?
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1. The communication channel bandwidth uses is 25 MHz centered at 1GHz and uses BPSK. The noise
power spectral density of the channel is 10^-9 W/Hz. The channel loss between the transmitter and
receiver is 25dB. The application requires a BER of less than 10^-4. Determine the minimum transmit
power required.
4. A differential BPSK transmitter consumes 10 W and provides a BER of 1*10^-7. If the system moves
to 16-QAM, what is new minimum transmit power?
5. The noise power (in watts) measured in a 40MHz Wifi channel is 230*10^-6 Watts. The access point
(AP) output power is 600 mW and only uses 256QAM and has a data rate of 400Mbps. The channel
losses can be modeled as 0.4dB/meter. An application on your phone requires a BER of < than 1*10^-4.
A) What is the maximum distance between the AP and your phone?
b) if the AP and my phone could switch to 64QAM and support the same data rate, what is the new
maximum distance between the AP and my phone?
Chapter 33 Solutions
Electric Motor Control
Ch. 33 - Prob. 1SQCh. 33 - Prob. 2SQCh. 33 - Prob. 3SQCh. 33 - What is the primary reason for using a compelling...Ch. 33 - What is the purpose of an accelerating relay?Ch. 33 - When is it most important to use decelerating...Ch. 33 - Why are different motor connections shown for what...Ch. 33 - How many windings are required for three-speed...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 3. You are to design a 9-volt battery operated communication system that has a center frequency of 2.4 GHz. It must last 10 years without replacing batteries. The application requires a BER of <10^-5 and a data rate of 500bps. The channel can be modeled as AWGN with a noise power spectral density of 10^- 8 W/Hz. (a) What modulation scheme would you use? B) what is the required capacity of the batteries? and (c) Is the battery commercially available?arrow_forwardRefer to the logic diagram of Figure. Gate 1 and gate 4 belong to the standard TTL family, while gate 2 and gate 3 belong to the Schottky TTL family and the low-power Schottky TTL family respectively. Determine whether the fan-out capability of gate 1 is being exceeded. Relevant data for the three logic families are given in Table 3(a).arrow_forward2. An existing system uses noncoherent BASK. The application requires a BER of <10^-5. The current transmit power is 25 Watts. If the system changes to a coherent BPSK modulation scheme, what is the new transmit power required to deliver the same BER?arrow_forward
- An inductive coil having negligible resistance and 0.1H inductance is connected a supply of 220V, 50 Hz. Calculate (a) Inductive reactance, (b) RMS value of Current, (c) Power consumed, (d) Power factor, (e) Write down the equations for voltage and current.arrow_forwardIf Fourier transform of f(t) is F(w) find Fourier transform of g(t) using only properties. d g(t) = f(2t)+8(3-1)+ ej(t-1)f(t) dtarrow_forward3z²+7z+1 dz (b) If C is the circle |z+i|=1. What is the value of S (a) If C is the circle |z+1|=1. z+1 (c) If C is the ellipse x²+y2=8.arrow_forward
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