Electric Motors and Control Systems
Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 1.1, Problem 2RQ

a. Calculate the theoretical body current flow (inamperes and milliamperes) of an electric shockvictim who comes in contact with a 120 V energysource. Assume a total resistance of 15,000 Ω skin, body, and ground contacts).
b. What effect, if any, would this amount of currentlikely have on the body?

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Q3:A: (a) A 10-hp 230-volt shunt-wound motor has rated speed of 1000 rpm and full-load efficiency of 86 percent. Armature-circuit resistance, 0.26 ohm; field-circuit resistance, 225-ohms. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon back emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?
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