Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 8, Problem 5SQ
To determine
Explain the effects on the contactor when the blowout coil’s terminals are reversed.
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Chapter 8 Solutions
Electric Motor Control
Ch. 8 - Prob. 1SQCh. 8 - What is the principal difference between a...Ch. 8 - What causes the arc to move upward in a blowout...Ch. 8 - Why is it desirable to extinguish the arc as...Ch. 8 - Prob. 5SQCh. 8 - Why will the blowout coil also operate on AC?Ch. 8 - Prob. 7SQCh. 8 - Are ON control stations used in multiple locations...
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- Why will the blowout coil also operate on AC?arrow_forward12) Welding generator will have A. Lap winding B. Wave winding C. Delta winding D. Duplex wave winding E. Star windingarrow_forwardHow to calculate the pitch factor of a 8 pole alternator with an armature wound coils having 18 / 24 fractioanl pitch. Can you please show the solution in details.arrow_forward
- Answer is 2.93 hz. Take No. Of poles = 2.arrow_forwardWhat are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a single-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I,II and III b. I only c. I and II only d. II and IIIarrow_forwardExplain the operation of the blowout coil used in dc contactorsarrow_forward
- Differentiate between the AC and DC magnetic fields applied to an induction motor stator.arrow_forwardExplain the need for connecting a capacitor in the auxiliary winding of a single phase induction motor.arrow_forward7- Iron loss in the rotor of a 3-phase induction motor is negligible due to (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts 8- The starting current of a 3-phase induction motor is about (a) Half (c) 5 to 7 times (b) Twice (d) 8 to 10 times 9- During plugging of an induction motor (a) Phase sequence is reversed (b) A de source is connected to stator (e) One phase is open circaited (d) Power is ied back to mains 10- Direct online (D.O.L.) starter is used for induction motors (a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core of its full load rated currentarrow_forward
- 1) Calculate the coil pitches and indicate the slots into which the first coil should be place for the following armature windings a. 36 slots , 4 poles b. 57 slots , 4 poles c. 76 slots , six poles d. 132 slots , eight poles e. 270 slots , 10 polesarrow_forwardHow to adjust reactive power in synchronous machine? A) by changing the load applied to the shaft B) by changing the frequency C) by changing the excitation current D) by changing the applied voltagearrow_forwardState the types of induction motorarrow_forward
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