Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 1, Problem 1.17Q
Will current be leading or lagging voltage in an inductive load? Will the reactive power of the load be positive or negative?
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Students have asked these similar questions
What is the importance of reactive power in power systems, and how is it managed through devices like capacitors and reactors?
Define the term Capacitance and Inductance?
Capacitance: It is the amount of charge that is stored inside a capacitor at a given voltage.
Inductance: It is defined as the property of a coil to resist any changes in electric current flowing through it. Mutual inductance happens when a secondary coil opposes current change in the primary coil.
Mention what is the difference between generator and alternator?
Both generator and alternator work on the same principle they convert mechanical energy into electrical energy.
Generator: It converts induced emf (Electro Motive Force) into direct current, where it based on stationary magnetic field and revolving conductor which rolls on the armatures with slip rings and brushes riding against each other.
Alternator: It has rotating magnetic and stationary armature for high voltage and stationary magnetic field and a rotating armature for low voltage
low voltage systemsWhich of the following is true in pure inductive circuit?
a) Current can be 90 forward or backward.
b) Current in phase with voltage.
c) The current lags behind the voltage by 90.
d) Current stays beyond 90 ° to voltage.
Chapter 1 Solutions
Electric machinery fundamentals
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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- If there is reactive power associated with a circuit element we can say a) That said element is purely resistive. b) That said element has a unitary power factor c) That said element has associated electric or magnetic fields d) None of the abovearrow_forwardIn reference to the load, how are capacitors connected to help prevent voltage spikes and surges? Are capacitors connected in parallel or in series with the load?arrow_forwardWhat is the significance of reactive power in power systems, and how is it managed?arrow_forward
- what is the effect of number of turns and radius in inductancearrow_forwardEach of the conductor in a parallel-plate capacitor is calleda. dielectricb. insulatorc. platesd. terminalarrow_forward1.1 Given the circuit in Figure 1, using Kirchoffs voliage law show that: jwME, Ez R1 + jwl1 R, R Figure 1 1.2 A ferromagnetic ring of cross-sectional area 800 mm and of mean radius 170 mm has two windings connected in series, one of 500 turns and one of 700 turns. If the relative permeability is 1200, calcula:e the self-inductance of each coil and the mutual inductance of each assuming that there is no flux leakage.arrow_forward
- a. individal current b. voltage sourcearrow_forwardAn inductor has an inductive reactance of 250 V when connected to a 60-Hz line. What will be the inductive reactance if the inductor is connected to a 400-Hz line?arrow_forwardWhat is reactive power, and how does it affect the voltage profile in a power system? Describe methods to control and manage reactive power.arrow_forward
- Okay for Determine the mathematical expression for the voltage vC and the current iC for the discharge phase. I got Vc = 8e-t/0.2s V and iC = -4e-t/0.2mA But I need help with the last question Plot the waveforms of vC and iC for a period of time extending from 0to 2 s from when the switch was thrown into position 1.arrow_forwardFor figure (1)draw and calculate the voltages waveform across each half of secondary winding and across load when 100sin2π60t applied across the primary, then find PIV.arrow_forwardAnother name for reactive power is?arrow_forward
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