Electric Machinery Fundamentals
5th Edition
ISBN: 9780071325813
Author: Stephen J. Chapman
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 1, Problem 1.18P
(a)
To determine
The value of complex power S consumed by the load.
(b)
To determine
Whether the load is capacitive or inductive.
(c)
To determine
The power factor of the load
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Assume that the voltage applied to a load is V = 2082-30° V and the current flow-
ing through the load is I = 5Z15° A.
(a) Calculate the complex power S consumed by this load.
(b) Is this load inductive or capacitive?
Answer the following:
a. A capacitance is connected to a 115 V, 25 Hz mains and takes a current of 5 A. find the current when both the capacitance and frequency are doubled.
b. A 220 V, 60 Hz circuit draws a current of 11 A with a power factor of 0.8 lagging. Find the resistance of the circuit.
a) why is there a wattmeter reading when the load is purely inductiveb) why is there no wattmeter reading when the load is purely capacitive
Chapter 1 Solutions
Electric Machinery Fundamentals
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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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