Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 49, Problem 8SQ
To determine
Explain the reason that may cause a de-energized brake to slip under load with maximum spring tension.
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What is plugging type braking?
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An 8-pole, 600 rpm dc shunt with 778
wave connected armature conductors of
12.5 ohms resistance at a terminal voltage of
250 volts. The armature resistance is 0.25
ohm the shunt field resistance is 250 ohms.
Determine the flux per pole?
(Our subject is Electrical Machines 1
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(I need a clear answer and solution. Thank you so much)
Chapter 49 Solutions
Electric Motor Control
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- Select the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.arrow_forwardWhat is regenerative braking system explains itarrow_forwardplease answer all question 1. What is the idea of interchanging two lead if the direction of rotation is wrong? 2. Explain the construction of squirrel cage I.M. 3. Explain the importance of slip measurement and give full load slip of the motor.arrow_forward
- How can you reduce the amount of voltage applied to the motor during inching?arrow_forwardD.a- A knocking sound that's coming from a pump is normally caused byA. a faulty coupling.B. a broken impeller.C. a leaking seal.D. pump cavitation.D.b- A DC motor will normally require that you replace which one of the following components on a regularschedule?A. BrushesB. ArmaturesC. GearsD. BearingsD.c- You're doing a PM inspection on a small chain-drive system. You see one side of the sprockets is shinywhile the opposite side is dull. This means that theA. chain is the wrong size.B. sprockets are worn.C. chain is worn.D. sprockets are misaligned.arrow_forward• T or F, modify the wrong part if False, please underline twice your answer if True or False. Lap-wound machines are designed for high-current, low voltage machines.arrow_forward
- For the Starting Up the Power Station Simulator Why are certain operations blocked by isolatorsarrow_forwardA starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?arrow_forward12.a. An electrical device would also fall into the classification of an electric(al)A. motor.B. load.C. component.D. fitting.12.b. A short circuit describes the condition where there's contact between theA. hot wire and the neutral wire.B. grounded conductor and the grounding wire.C. hot wire and the grounding wire.D. neutral wire and the grounded conductor.arrow_forward
- pole-zero(control systems)arrow_forwardWhile discussing armature testing: Technician A says to test for shorts, place the ohmmeter leads on a commutator segment and armature shaft. Technician B says that continuity should exist between the commutator and the armature shaft. Who is correct?arrow_forward
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