Electrical Wiring Residential
Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 21.1, Problem 8R
To determine

Mention whether the plans indicate a wall switch for the controlling operation of a food waste disposer or not.

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The short-circuit test has been carried out on a single-phase transformer of 2500kVA,50kV/10kV, with the following results: 4000V,  50A , 50000 WIt is known that the transformer has a vacuum current equal to 2% and its efficiency at full load fp=1 is 97.5%. Calculate: A. Parameters of the excitation branch. Rfe, JXm, Pob. Relative voltage drops. εcc, εrcc, εxcc
Magnetic Field Analysis of a Helical Coil In this lab you will analyse the inductive coil structure shown in Figure 1. It comprises a solid round copper wire of radius a = 0.8mm, wound into a cylindrical spiral having N = 20 turns, major radius R = 10mm and an axial pitch p = 2mm. The coil is excited by a dc current of 1A. R P 1 (a) Analytic Calculations Figure 1: Helical Air-cored Coil Using the expressions developed in the class, estimate the magnetic flux density B at the centre of the coil. Recall from EN1216 that for a long solenoid, the flux density is given by: HONI B l As we saw in the class (see section 4) a modified expression can also be derived that eliminates the need for the 'long' solenoid assumption: R α1 Р â B = HONI 2l (cosa₂-cosα1) 1 Compare the results obtained using equations (1) and (2) and state which solution you would expect to give the best approximation to the real coil behaviour.
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