EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 4, Problem 11SQ
To determine
Choose which type of switch (normally open or normally closed) would be installed for float switch in Figure 4-12.
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8-1) similar to Lathi & Ding, Prob. P.5.1-2
The figure below shows the Fourier spectra of signals of g,(t) and g₁(t). Determine the Nyquist rate and
the corresponding sampling interval for signals of g,(t), g,(t), g₁(1) - g¸(1), g¸³(t), and g₁(1)g₁(1).
Hint: Use the frequency convolution and the width property of convolution.
G₁(f)
G₂(f)
-8000
0 8000 f
-20000
10
20000 f
• We will use the Wattmeter to find the average power supplied/absorbed by each component.
The following figure shows how to connect the Wattmeter to measure the average power
absorbed by the resistor. Note that the Wattmeter consists of a Voltmeter and an Ammeter. The
Voltmeter must be connected in parallel with the component and the Ammeter must be connected
in series with the component. You must pay attention to the polarity of the voltage across the
component as well as the direction of the current flowing through the component.
5Vpk
1kHz
30°
ww
40
Z=A-JB
Wattmeter-XWM1
2.503 W
Power factor:
1.00000
Voltage
Current
•
•
Similarly connect a second Wattmeter to measure the average power supplied by the source.
Connect a third Wattmeter to measure the average power in the capacitor. Does this value agree
with the theoretical value?
Perform Interactive Simulation under Analysis and Simulation. Double click on Wattmeters to
see the average power values. Note that the Wattmeter also…
• We will use the Wattmeter to find the average power supplied/absorbed by each component.
The following figure shows how to connect the Wattmeter to measure the average power
absorbed by the resistor. Note that the Wattmeter consists of a Voltmeter and an Ammeter. The
Voltmeter must be connected in parallel with the component and the Ammeter must be connected
in series with the component. You must pay attention to the polarity of the voltage across the
component as well as the direction of the current flowing through the component.
5Vpk
1kHz
30°
ww
40
Z=A-JB
Wattmeter-XWM1
2.503 W
Power factor:
1.00000
Voltage
Current
•
•
Similarly connect a second Wattmeter to measure the average power supplied by the source.
Connect a third Wattmeter to measure the average power in the capacitor. Does this value agree
with the theoretical value?
Perform Interactive Simulation under Analysis and Simulation. Double click on Wattmeters to
see the average power values. Note that the Wattmeter also…
Chapter 4 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 4 - Identify the following symbols.Ch. 4 - Electrical symbols usually conform to which...Ch. 4 - What do the following abbreviations stand for? a....Ch. 4 - Single-pole and double-pole switch symbols are...Ch. 4 - The symbol shown is a a. polarized capacitor. b....Ch. 4 - The symbol shown is a a. normally closed float...Ch. 4 - The symbol shown is a(n) a. iron core transformer....Ch. 4 - The symbol shown is a a. normally open pressure...Ch. 4 - The symbol shown is a a. double-acting push...Ch. 4 - If you were installing the circuit in Figure 412,...
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- 8-3) Bandpass sampling A bandpass signal is confined to the frequency range from 7.5 to 10.5 kHz. Find the allowed ranges of the sampling rate for this signal. Sketch the amplitude spectrum of a hypothetical message, the amplitude spectrum of the sampled signal, and the transfer function of a suitable recovery filter if the sampling rate is chosen in the center of the lowest range available.arrow_forward8-4) Similar to Lathi & Ding, Prob. P.5.1-5 6.1-4 A low-pass signal g(t) sampled at rate of fs > 2B needs reconstruction. The sampling interval is Ts = 1/fs. (a) If the reconstruction pulse used is p(1) = [1 - specify the equalizer filter E(f) to recover g (1). (b) If the reconstruction pulse used is p(t) = П Ts/2 specify the equalizer filter E(f) to recover g (1).arrow_forward8-2) Lathi & Ding, Prob. P.5.1-1 Determine the Nyquist sampling rate for the following signals, explaining your method: (a) 4 sinc(420лt); (b) 5sinc² (6500лt); (c) sinc(1800лt)+ sinc² (2000лt); (d) 2 sinc(500лt) sin(300л)arrow_forward
- 2) A load consisting of a 1350 Q2 resistor in parallel with a 405 mH inductor is connected across the terminals of a sinusoidal voltage source Vg, where Vg = 90 cos(2500t) V. Find a) the average power delivered to the load, b) the reactive power for the load, c) the apparent power for the load, and d) the power factor of the load.arrow_forward4) Find the phasor voltage Vs for the following circuit if loads L1 and L2 are absorbing 15 kVA at 0.6 pf lagging and 6 kVA at 0.8 pf leading, respectively. Express Vs in polar form. + j10 + 200/0° V(rms) | L1 Li L2arrow_forward3) A 100-V rms, 60 Hz source is applied to a load impedance Z. The apparent power entering the load is 120 VA at a power factor of 0.707 lagging. a) Calculate the complex power b) Find the rms current supplied to the load c) Determine Z d) Assuming that Z = R + jwL, find the values of R and L.arrow_forward
- Q1. Choose the correct answer 1. With fixed number of quantization levels in PCM, the quantization noise is (linearly proportional to signal amplitude, non-linearly proportional to signal amplitude, linearly proportional to signal frequency, non-linearly proportional to signal frequency). 2. A PCM encoder uses 130 quantization levels. Which of the following N bits is more economical to encode such signal? (N=6, N=7, N=9, N=10). 3. Frequency Shift Keying can be accomplished by _multiplying two On-Off Keying signals, combining two Frequency Shift Keying signals, adding two (adding two On-Off Keying signals, Frequency Shift Keying signals). 4. Which of the following statements is true with respect to PCM? (The parallel binary data is converted into serial before transmission, Analog data is transmitted directly, Analog signal is amplified before transmission, The analog signal is converted into parallel binary data before transmission). 5. A baseband speech signal of maximum frequency of…arrow_forwardThree speech signals are TDM multiplexed with a high-quality music signal. If each speech signal is sampled at 16 kHz and PCM quantized by 8 bits/sample, while the music signal is sampled at 64 kHz with the same PCM quantizer. 1. Draw the block diagram of this TDM. 2. Calculate the output bit rate of this TDM.arrow_forwardYou and your crew have made it through the night and the day has brought more warmth. After searching the industrial site, you find an abundant amount of fuel to run the generators to keep you warm. You also find a memory card labelled “cure”, but your cell phone battery is dead. First things first, you will need to stay safe as the zombies continue to hunt you in your current location. The industrial site is surrounded by a metal chain-link fence. You decide you will electrify the fence to keep the zombies from scaling it. But the output voltage from the generators is not high enough to really deter them. You would like to apply around 10 kV to the fence (AC or DC, at that voltage it doesn’t really matter). You find a transformer that you can use but it only has a turn ratio of 10. You find some diodes and capacitors and construct the circuit shown in Figure 3 with the intention of hooking Vout to the fence. Perform a simulation, displaying the voltage Vout using a scope.…arrow_forward
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