Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 56, Problem 2SQ
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List the devices that are used to energize the magnetic clutch.
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Electric Motor Control
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- 5) The deflecting torque of an ammeter varies as the square of the current flowing through it. If a current of 10 A produces a deflection of 90°, what deflection would occur for a current of 5 A when the instrument is (a) spring controlled and (b) gravity controlled? [Ans. (a) 22.5°, (b) 14.5°]arrow_forwardWhat is the major difference between a magnetic starter and a contactor?arrow_forwardWhat is the difference between a magnetic starter and a contactor?arrow_forward
- Answer Letter C only.arrow_forwardA 4–pole, 500 V d.c. shunt motor has 720 wave–connected conductors on its armature. The full–load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Ω. What is the full–load speed of the motor?arrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
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