Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 1, Problem 9SQ
To determine
Choose the correct option that does not represent the considering feature of the speed control of a motor.
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When field voltage is controlled to provide a method of variable speed control, the system is using a concept known as field
A. drive.B. weakening.
C. stability.
D. bias.
18. When field voltage is controlled to provide a method of variable speed control, the system is using a
concept known as field
A. drive.
B. stability.
C. bias.
D. weakening.
Is the motor speed controller able to protect current, voltage limitation? How is it done?Explain.
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- The amount of short-circuit current from a motor is equal approximately to_current for each motor. A.accelerating b. locked-rotor c. stator d. finalarrow_forwardDraw the equivalent circuits for each of the following motor types in your logbook: DC Shunt Motor; DC Compound Motors; DC Series Motor. Include for each motor the placement of ammeters and voltmeter to measure input current, armature current and input voltage. Also include a rheostat in the shunt field circuit of the Shunt and Compound motors for the adjustment of no load motor speed.arrow_forwardMu culty of ectrical. aduat al 1 (B)- Select the correct answer for the alternatives given. 1- When the voltage applied to the armature of a de shunt motor is decreased, what happens to the motor speed? (a) It decreases. (b) It increases, (c) The motor stops, (d) It becomes uncontrollab 2- The starting current is high in d.c shunt motor because (a) The armature resistance is small very (b) The speed of motor is equal zero AVAIR I-X2 (c) The back E.M.F is equal zero R. v (d) (a)+(b)+(c) 3- The generation of electricity achieved by moving a conductor in a magnetic field due to the relation a) E-ILB, b) E= BLV c) E-qVB) d) E-F.L.B " PZ 4- A 4-pole generator has a wave-wound armature with 722 conductors and the armature current is 60 Amper on full load. The armature m.m.f is equal b) 1353.75 A.T a) 5415 A.T c) 2707.5 A.T d) 676.675 A.T 9arrow_forward
- 21.a. When field voltage is controlled to provide a method of variable speed control, the system is using aconcept known as fieldA. stability.B. drive.C. bias.D. weakening. 21.b. What type of motor has the same wire diameter in both the field and the armature coils?A. Interpole-woundB. Series-woundC. Compound-woundD. Shunt-woundarrow_forward14-Which is the most effective and currently used method in asynchronous motor speed control methods?A) changing the number of polesB) changing voltage and frequency togetherC) changing the voltage frequencyD) changing the applied voltagearrow_forward1.) Variable frequency drive (VFD) is an electrical equipment used to control__________ of AC motors.a. torqueb. starting currentc. Sychronous/ Rotor Speedd.) Motor Slip 2.) The Start pushbutton of a motor controller requires ________ in orer to keep the motor running even if the start pushbutton is releaseda.) Thermal overload relayb.) Control transformerc.) Transient Suppressord.) None of the Above 3.) Magnetic Contractors of motor controller requries_____ for latching and signaling purposesa.) Thermal Overload Relayb.) Auxilliary contractsc.) Transient Suppressord.) None of the Abovearrow_forward
- 1.(Im) does the excitation circuit current change as motor current changes? explain the reasons.arrow_forward20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.arrow_forwardSolve on keyboard clear and correct answer or will dislike In Induction motor, the load test has done. The result get is like the table below.1) Explain why the speed(rpm) is increase when voltage is increase?2) Explain why when the voltage reach in maximum the speed(rpm) is decrease?Answer all questions by explaination. Solve on keyboard clear and correct answer or will dislikearrow_forward
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