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Circuits

Three Zones of a Single Phase Circuit

Three zones of a single-phase circuit are identified in the figure attached. The zones are connected by two transformers T1 and T2, whose ratings are also shown in the same figure. Using base values of 20kVA and 115 volts in zone-3 calculate the per-unit impedances. Neglect the transformer winding resistances and the shunt admit

Communications Systems

A speech scrambler transforms low frequency to high frequency components and vice versa so that a baseband signal of bandwidth B is transformed to another baseband signal of the same bandwidth and a components at the frequency f is transformed into a component at the frequency B-f, where B is the bandwidth of the signal. An exam

Resonant Frequency of a Circuit

Refer to the diagram attached. 1. Calculate the resonant frequency of the circuit 2. Calculate the magnitude of the circuit current at resonance. 3. Calculate the value of VOUT at resonance. 4. Explain why the circuit current is capacitive (i.e. leads the supply voltage) at very low frequencies and inductive at very high fr

Fault Tolerant Volume Control

In a certain application the following circuit serves as a fault tolerant volume control. What value must the potentiometer (P) be in order for the total resistance to be 50ohms?

Virtual Circuits

The following design problem concerning implementation of virtual circuit service. If virtual circuits are used internal to the subnet, each data packet must have a 3-byte header, and each router must tie up 8 bytes of storage for circuit identification. If datagrams are used internally, 15-byte headers are needed, but no router

Question about Electrical Energy Conversion

A 100 kVA, 60 Hz, 7200/480 V, single-phase transformer has the following parameters (all expressed in ohms): RHV = 3.06 RLV = 0.014 XHV = 6.05 XLV = 0.027 Xm,HV = 17,809 Re,HV = 71,400 The transformer supplies a load that draws rated current at 0.75 power factor lagging at 480 V at the load. Sketch the approximate eq

Two power sources in a circuit

I need to find the voltmeter reading and how to deal with 2 power sources Is this going into Thevenins or Kirchoff's? (Please see the attachment.)

Please, show me how you got the answers and give me the answers. Thanks

1. A series RL circuit containing a 0.17-H inductor has a time constant of 0.13 s. What is the resistance in the circuit? 2. A 1000-ohm's resistor is joined in series with a 400-mH inductance and a 12-V battery. (a) What is the time constant of the circuit? (b) How long will it take after the circuit is completed for voltage

Charge flow from one capacitor to another

Why and how does charge flow from one capacitor to another capacitor when the two are connected to each other by a conducting wire? I am not able to understand that; why and how does negative charge flow from a capacitor having lower potential difference between its plates to a capacitor having higher potential difference betwe

RC Circtuit with Expulsion = 12.0 votes

Consider an RC circuit with epsilon = 12.0 V, R = 175 ohms, and C = 55.7 micro-F. Find (a) the time constant for the circuit, (b) the maximum charge on the capacitor, and (c) the initial current in the circuit.

LRC Circuits

Please refer to the attached file. How much should damping ( ) affect the result of the angular frequency for impulse response? (see attachment) In equation XVI.5, the details of the differentiation of I(t) are omitted. Take the derivative of I(t) and explicitly show how the voltage across the inductor L varies with time.

Undistorted Sinusoidal Signals in a Diode Circuit

In the diode shown, the diodes are ideal except that each is modeled by a voltage source of 0.5V in series with a (diode) resistance of rd = 20, when forward biased. A sinusoidal signal Vs with input impedance Rs=100 is connected to the diode circuit. Determine the maximum value of Vs such that Vo remains sinusoidal, with no dis

Depletion-Load NMOS Amplifier

A depletion-load NMOS amplifier and its small-signal equivalent circuit are shown in the figures. For the small signal parameters gm1=0.2 and mA/V, gm2=0.04mA/V, ro1=ro2=50k and CL= 20pF, calculate the mid-band voltage gain Vo/Vi. ==================================== a) vo/vi = -2.5 v/v b) vo/vi = -1.5 v/v c) vo/vi = -2.0 v/

Define appropriate resistor values in a battery-charger circuit

The attached file shows the circuit in question along with information about the components (zener diode, op-amp, and BJT transistor). Problem Statement: The simple circuit shown below is a battery-charge circuit. It operates from a DC power supply having Vcc=22V. The fully charged NiCd battery pack exhibits Vb=12.08V. Opera

Seal-In Circuit with Internal Relay Control

Problem involves a seal-in circuit with an internal relay control. Please see attached for description. I'd like to see the ladder logic diagram as to how the problems are to be diagramed. I had only two lines of ladder logic for part a, but I think there may be more. Can anyone give me a firm understanding on this? Thank

Wildar current source/active loads

These are two transistor problems based on textbook (Electronic Circuit Analysis and Design, 2nd ed by Neamen). See attached file for full problem description.

Op Amps

Attached is the problem and the work I've done so far. Please check to make sure it is absolutely correct and then help me understand and SOLVE the rest of the problem. **Any bottom of any circuit cutoff, it's just a horizontal line for ground w/ nothing else.

RL/RC Circuits

A series RL circuit with L = 3.00 H and a series RC circuit with C = 3.00 have equal time constants. If the two circuits contain the same resistance R, (a) What is the value of R and (b) What is the time constant?

Develop a state space model of a current-fed series RC circuit.

Develop a state space model of a current-fed series RC circuit. Use Simulink to simulate the dynamic behaviour of a current-fed series RC circuit. What happens when you do a parameter analysis of this model? Explain your observations! The attachments are: A model of a voltage - fed series RC circuit And a model of the RC

Circuit Theory Problem

Assume an infinite network made of 1nH inductors as shown. Furthermore assume that there is not mutual inductance. What is the effective inductance between points A and B? [The number only, i.e. Leff =?] (see diagram in the attached file for visual representation)

AC/DC BJT transisitor Circuit Analysis

For the circuit in the image, Beta=120, VCC=5V, Va=100V, and Rb=25kohms. Determine Vbb and RC such that Rpi=5.4kOhms and the Q-point is in the center of the load line. I have a formula for Rpi=(Vt*Beta)/Icq. From this I found Icq=1.25x10^-4 Amps. However, is this a correct way to determine Icq? The question said to d

Bias stable circuit design with capacitors

For the circuit, design a bias stable circuit such that Icq=.8mA and Vceq=5V. Let Bf=100. Using the results, determine the percentage change in Icq if Bf is in the range of 75<=Bf<=150. Repeat this if Re=1kOhms. Rth=.1(1+b)re=.1*101*.5Kohms=5050 Ohms I can do KVL around the b-e loop to find Vth, but how do I split the two

Circuit Output

For the circuit in Fig. P3.105, each utilizing an ideal diode(or diodes), sketch the output for the input shown. Label the most positive and most negative output levels. Assume CR.>>T. Please see the attached document.

Design a logic circuit

Design a logic circuit with 4 inputs and an output. Please see the attached MS Word file for the complete problem and table.

Anesthetic vaporization and controlled delivery

In a vaporizer a volatile anesthetic liquid is evaporated into a gas which eventually flows to the patient. A lot of attention is directed toward temperature maintenance in order to assure that the patient receives the proper concentration. Why is temperature control important? What methods can be used to actually control the

Fermi Energy and Circuits

REVISION QUESTIONS Please could you provide detailed answers from the questions below; 1. a silicon n-p-n bipolar junction (BJT) is designed with emitter, base and collector doping levels of 1019 cm-3 , 1015 cm-3 and 5 × 1017 cm-3 , respectively. Assuming the intrinsic carrier concentration (ni) in silicon to be 101