Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 59, Problem 8SQ
What might be a hazard if a motor is started in the wrong direction?
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Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW
at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The
cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm².
The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per
km of conductor of 1 cm² cross-section is 0.173ohms.
First Draw the equation then solve it
using double integral
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Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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