Share
Explore BrainMass

Power Engineering

PLC Input and Power Supply

Attached are shown several external components and a 12 volt 8-point common input module for a PLC. The inputs on the input module share a single common terminal (COM). The inputs are bipolar. The sensor has a PNP output. It is powered by Vcc = 12V and its output transistor is ON when the sensor is ON. Wire the components to the

Power Factor Correction

Three parallel impedances in rectangular form as follows: 8.66+j5 ohm , 25+j0 ohm , 3.54+j2.54. A 240 volt 50 Hz supply Calculate overall power factor of the three loads.

ECL Gate

I would like a circuit diagram of the output stages of an ECL gate. Also stating the logic function

Electrical networks

Engine consumes 5kw of power and a reactive power of 2kvar at current of (3+j2) Amps. Find the applied voltage in complex form V=(a+jb). Then use P=Re(VI*) and Q=IM(VI*) to form two simultaneous equations. Please show workings.

Electrical networks

An engine consumes 10kw of power and 4kvar reactive power at a current of (6+j4)Amps . Find the applied voltage in complex form using P=Re(VI) and Q=Im(VI) as simultaneous equations. Obviously V=(a+jb)

Solving for Power

If the voltage and current supplied to a circuit or load by a source are: Vs = 170<(-0.157) V Is = 13<0.28 A determine a) The power supplied by the source which is dissipated as heat or work in the circuit (load). b) The power stored in reactive components in the circuit (load). c) The power factor angle and power facto

Complex power of electrical load

An electrical load operates at 240 Vrms. The load absorbs an average power of 8kW with 0.8 lagging power factor. How do I compute the complex power of the load and impedance?

Current, Power and Total Power

For the circuit shown in Figure 2.24 (attached file), find: a) The currents i1 and i2. b) The power delivered by the 3-A current source and by the 12-V voltage source. c) The total power dissipated by the circuit. Let R1=25 ohms, R2= 10 ohms, R3= 5 ohms, R4= 7 ohms, and express i1 and i2 as functions of v. (Hint: Apply KCL

Terminal Voltage & Power Supplied/Dissipated

Refer to Figure 2.16 (see attached file): a) Find the total power supplied by the ideal source. b) Find the power dissipated and lost within the nonideal source. c) What is the power supplied by the source to the circuit as modeled by the load resistance? d) Plot the terminal voltage and power supplied to the circuit as a fu

Supplying and Dissipating Power

Determine which elements in the circuit of Figure 2.10 (attached file) are supplying power and which are dissipating power. Also, determine the amount of power dissipated and supplied.

Capacitance

Prior to t=0, a 100- uF capacitance is uncharged. Starting at t=0, the voltage across the capacitor is increased linearly with time to 100V in 2s. Then, the voltage remains constant at 100V. Sketch the voltage, current, power, and stored energy to scale versus time. Please show equations for the sketches.

Capacitance

The current through a 3-uF capacitance is shown in the attachment. At t=0, the voltage is v(0)=10v. Sketch the voltage, power, and stored energy to scale vs. time. In the sketch of each one, I need the equations worked out for each plot. (See attached file for full problem description)

Circuit Elements - Power Dissipated

Given the circuit shown in the attachment find: values and power dissipated. (Please see attachment for complete question and diagram. Thanks)

Rankine Cycle - Net Power, Thermal Efficiency and Heat Transfer

Water is the working fluid in a vapor power cycle with reheat, superheat and reheat. Superheated steam enters the first turbine stage at 8 MPa, 480 C and expands to 0.7 MPa. It then is reheated to 480 C before entering the second turbine stage, where it expands to the condenser pressure of 8 KPa. The mass flow rate of steam e

Complex Power and Impedance

Question: An electrical load operates at 240 volts rms. The load absorbs an average power of 8 kW at a lagging power factor of 0.8. a) Calculate the complex power of the load. b) Calculate the impedance of the load. Please view attachment for multiple choice options.

Dissipations of Power in Lightbulbs

An incandescent lightbulb rated at 100 W will dissipate 100 W as heat and light when connected across a 110-V ideal voltage source. If three of these bulbs are connected in series across the same source, determine the power each bulb will dissipate.

Turbine Unit and Mechanical Output Generated

An area of an interconnected 60 hz power system has three turbine generator units rated 100MVA, 200MVA, and 600MVA respectively. Regulation constants are given for each unit, with the load suddenly decreasing by 100MW. With assumptions made and a frequency response of beta = 165 p.u., calculate the MW decrease in mechanical ou

A Three-Phase Overhead Transmission Line

A three-phase overhead transmission line line has a per-phase resistance of 0.15 ohm/km and a per-phase inductance of 1.3263 mH/km. Assume that the shunt capacitance is negligible. The length f the line is 40 kilometers and it operates under 220 kV and 60-Hz. The line is supplying a three-phase load of 381 MVA at 0.8 power facto

Power-Flow Solution (Calculate Phase Angle via Real and Reactive Power Equations)

Consider the electric power system shown {see attachment}. The power-flow solution of this system can be obtained without resorting to iterative techniques. The elements of the bus admittance matrix Ybus have been calculated as: {see attachment}. Calculate the phase angle {see attachment} by using the real and reactive power

Electronics (about operational amplifier)

Show how an ideal Operational Amplifier with an open loop gain = A can be used to provide: i) a non-inverting amplifier with gain= +6v/v. ii) an inverting amplifier with gain= -3v/v. iii) an integrator with gain= +3. Explain the purpose of every component in your circuits. Please see attached for full question.

Electrical Energy Conversion: Synchronous Generator

Synchronous Generator A 250 kVA, 280 V, three-phase, four-pole, 60 Hz, synchronous generator with a synchronous reactance of 0.99 ohms per phase is operating at rated conditions and a power factor of 0.832 lagging. The magnetization curve for the generator is shown in Figure 1. a. Sketch a phasor diagram for the generator. b.

Probability of a False Alarm: Noise Power

The fixed threshold of a radar detector was set, assuming a known noise power, to yield P_FA = 10^-6. The actual noise power was 3 dB higher than expected. What will be the actual P_FA?

Power Systems - Nodal Equations, Y Bus Matrix and P&Q

1. {see attachment for diagram and details} All reactances are on the System's Base. Write the Nodal Equations and the YBus Matrix. 2. {see attachment for diagram and details} Find P&Q delivered from the generator's terminals to the system

Power Systems Problem (3-Phase Fault; Matrices; Matrix Inversion)

For a 3-Phase fault at Bus 3, find (see attachment) the post fault bus voltages for each bus, and the currents to all busses. Show your work, including the Y & Z matrices. Explain your method of matrix inversion. **Please see attachment for complete question and diagram.

Electrical Power Systems Problems

Electrical Power Systems Problems 1. A three-phase line serves a 54MW load with a .9 lagging power factor at a line voltage of 138KV. The line constants are: A = D = 1 at 0 degrees B = 85 ohms At 70 degrees C = 950 x 10^4 siemens at 90 degrees Find the line and phase values of voltage and current at the sending end.