ELECTRIC MOTORS+CONTROLS ACTIVITIES MAN.
3rd Edition
ISBN: 9781260439380
Author: Petruzella
Publisher: MCG
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Textbook Question
Chapter 8.1, Problem 1RQ
In what way is resistance wire different from the wire used for circuit conductors?
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E2.6 Consider the following neural network.
Input Sat. Linear Layer
Linear Layer
purelin(Wa+b)
Sketch the following responses (plot the indicated variable versus p for (-3
E2.3 Given a two-input neuron with the following weight matrix and input vector:
w=[32] and p = [-5 7], we would like to have an output of 0.5. Do you
suppose that there is a combination of bias and transfer function that might allow
this?
i. Is there a transfer function from Table 2.1 that will do the job if the bias is zero?
ii. Is there a bias that will do the job if the linear transfer function is used? If yes,
what is it?
iii. Is there a bias that will do the job if a log-sigmoid transfer function is used?
Again, if yes, what is it?
iv. Is there a bias that will do the job if a symmetrical hard limit transfer function is
used? Again, if yes, what is it?
E2.2 Consider a single-input neuron with a bias. We would like the output to be -1
for inputs less than 3 and +1 for inputs greater than or equal to 3.
i. What kind of a transfer function is required?
ii. What bias would you suggest? Is your bias in any way related to the input
weight? If yes, how?
iii. Summarize your network by naming the transfer function and stating the bias
and the weight. Draw a diagram of the network.
Chapter 8 Solutions
ELECTRIC MOTORS+CONTROLS ACTIVITIES MAN.
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- E2.1 A single input neuron has a weight of 1.3 and a bias of 3.0. What possible kinds of transfer functions, from Table 2.1, could this neuron have, if its output is given below. In each case, give the value of the input that would produce these outputs. i. 1.6 ii. 1.0 iii. 0.9963 iv. -1.0arrow_forwardQ2. The slew rate of an amplifier can cause signal distortion at its output if wrongly chosen. State the criterion for selecting the slew rate of an amplifier to avoid signal distortion. A step signal of 5 mV is applied to an inverting amplifier shown in Figure 2, which has a slew rate of 0.05 V/us. Estimate the time required for the output voltage of the amplifier to reach within 10% of its final value. If the input to Figure 2 is a sinusoidal signal of 0.02 sin(2πft) V, determine the maximum frequency that can be applied to the circuit without causing signal distortion due to the limitation of its slew rate (0.05 V/µs). In order to minimise the output offset voltage of Figure 2, a compensating resistor should be added to Figure 2. Draw a modified circuit diagram that includes the compensating resistor. Determine the appropriate value for the compensating resistor. V₁ 2 ΚΩ 100 ΚΩ +arrow_forwardQ3) A single-phase semiconverter, shown in Fig.(3), is used to control the speed of small separately excited d.c. motor rated at 4.5 kW, 220V, 1500 rpm. The converter is connected to a single phase 230 V, 50 Hz supply. The armature resistance is Ra = 0.50 ohm and the armature circuit inductance is La 10 mH. The motor voltage constant is Ke D = 0.1 V/rpm. With the converter operates as a rectifier, the d.c. motor runs at 1200 rpm and carries an armature current of 16 A Assume that the motor current is continuous and ripple-free == (a) Draw and drive an equation for output voltage of semiconverter (b) The firing angle a. (c) The power delivered to the motor. (d) The supply power factor. R₂ FWD Thi Th₂ D. D FWD ep Fig.(3) Da ectearrow_forward
- Q3) A single-phase semiconverter, shown in Fig.(3), is used to control the speed of small separately excited d.c. motor rated at 4.5 kW, 220V, 1500 rpm. The converter is connected to a single phase 230 V, 50 Hz supply. The armature resistance is Ra = 0.50 ohm and the armature circuit inductance is La = 10 mH. The motor voltage constant is Ke Q=0.1 V/rpm. With the converter operates as a rectifier, the d.c. motor runs at 1200 rpm and carries an armature current of 16 A Assume that the motor current is continuous and ripple-free (a) Draw and drive an equation for output voltage of semiconverter (b) The firing angle a. (c) The power delivered to the motor. (d) The supply power factor. R FWD Th₁ Th₂ D. D FWD ep Fig.(3) Da ectearrow_forwardE2.4 A two-layer neural network is to have four inputs and six outputs. The range of the outputs is to be continuous between 0 and 1. What can you tell about the network architecture? Specifically: i. How many neurons are required in each layer? ii. What are the dimensions of the first-layer and second-layer weight matrices? iii. What kinds of transfer functions can be used in each layer? iv. Are biases required in either layer?arrow_forwardE2.5 Consider the following neuron. Input General Neuron ΣΠ Sketch the neuron response (plot a versus p for -2arrow_forwardQ1. All transistors shown in Figure 1 are identical. They have the following properties: ẞ = 200, VT = 0.026 V and VBE = 0.7 V. In order to set the bias current of the differential amplifier to I = 1.8 mA (see Figure 1), determine the value of the resistor, R. Determine the DC output voltage at the output terminals V01 and V02. The input signal to the differential amplifier is given as (v1 - Viz) = 12 sin(wt) mV, determine the total output voltage at terminal vo1. Explain how to eliminate the DC voltage at the output terminal, V01. Sketch a circuit diagram that can fulfil this requirement. R +20 V 20 ΚΩ Vil V02 ના 50711 20 ΚΩ I = 1.8 mA Vizarrow_forwarda. An amplifier has a gain of 500. What is the dB gain? b. A three-stage amplifier system has dB gains of 15 dB, 32 dB, and 6 dB. What is the overall gain of the system in dB?arrow_forwardQ1) A 3-phase full converter charges a battery from a three-phase supply of 230 V 50 Hz. The battery amf is 200 V and its internal resistance is 0.552. On account of inductance connected in series with the battery, charging current constant at 20A. (a) Compute the firing angle delay and the supply power factor Also Draw output voltage. (b) In case it is desired that power flows from de source to ac load in part (a), find the firing angle delay for the same current.arrow_forward6:22 PM P Expert Help 4G +40345 73 K/S EaEDnD#9140 17:09 find the fct)= fourier series 0 when -7444D の1 When 04+<752 -1 when 7/22ヒム This was my answer when is solved 2 sin () (1+(-1)-2 003 (5) f(t)=2 cas (nut) + 3=1 Απ mt find the for series (ct)= ro when -arrow_forwardQ4. Determine the Y-parameters at a frequency of 100 MHz for the two-port network shown in figure 4. Present your answer in matrix form. R1 R-10 m са C-20F 11 R2 C1 CF 1-10 H R 12 C4 C-100 OF C-50 F Figure 4arrow_forwardQ3. a) For the circuit shown in figure 3, use nodal analysis to obtain a complete set of circuit equations, presenting your answer in matrix form. Compute the potential across and the current flowing through the ZL element, given: IS = 12sin(wt) A, R1 = 30, R2 = 50, L1 = j4 Q, L2 = j10 Q and ZL = (2+2) b) IS R1 L2 Figure 3 w R2 ZL Using equations and text, define the two-port impedance parameters.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_iosRecommended textbooks for you
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