Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 59, Problem 7SQ
What is an orderly step-by-step procedure in successful troubleshooting?
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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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- What basic sensory faculties should a troubleshooter rely on?arrow_forward5) 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_forwardThe following information is given for a 300kW, 600V, long shunt compound DC generat or, shunt field resistance is 75 ohms, armature resistance 0.01, brush resistance is 0.011 ohrms, series field resistance is 0.012 ohms and the divert or resistance of 0.036 ohms.When the machine is delivering full load; a. Draw the circuit diagrarn b. Calculate the voltage and C Power generated by the armat ure.arrow_forward
- Q1. Which of the following is not true of a DC machine commutator? (a) Its made of copper (b) Its also known as slip rings (c) Its also known as split rings (d) Its mounted on the rotor shaft (e) Its connected to the armature conductors Q2. Which of the following is true of a DC machine commutator? (a) The commutator provides external access to the armature via the brushes (b) The commutator segments are electrically insulated from each other and the rotor (c) The commutator acts as a mechanical rectifier in a DC generator (d) The commutator ensures that the current entering the armature of a DC motor is of the correct polarity (e) All of the above The main reason why Copper is preferred over Aluminum for DC machines windings is because: Q3. (a) Copper is less expensive than Aluminum (b) Copper is a better conductor than Aluminum (c) Copper is lighter than Aluminum (d) Copper has a higher melting point than Aluminum. (e) All of the above.arrow_forwardWhat are the three main electrical test instruments used in troubleshooting?arrow_forwardList the probable causes if the armature dos notable release after the magnetic starter is de - energized .arrow_forward
- I need the answer as soon as possiblearrow_forwardWhy should mechanical engineers be concerned about electrical safety? Before working in an electrical setting, discuss the prerequisites.arrow_forwardWhat is the difference bewteen a grounded control system And a floating control system?arrow_forward
- 1. 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_forwardWhat do you mean by manometric efficiency, mechanical efficiency and overall efficiency of centrifugal pump ?arrow_forwardA step up chopper has an input of 200 volts and output of 250 volts. The blocking period is each cycle is 0.6x10-3 seconds. Find the period of conduction in each cycle and frequency of operation?arrow_forward
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