توربي5- (A) For 4 e d.c. machine armature winding with a double layer progressiveSump wave winding with 21 number of slots answer the followinga-How many coils are present?b- What are the pole pitch and back pitch in terms of number of slots?What is the total number of armature conductors presents?d- What is commutator pitch in terms of commutator segments? -21 Noe- How many parallel paths are present?2slot(10 marks)(15 marks)(B)- Find the back, front and commutation pitch of 4-poles, 17 slots wave connected DC machine,if the selected developed windings diagram is duplex progressive.GOOD LUCK(10 marks)

Step 1: Step 2: Step 3: Step 4:

Answered: توربي 5- (A) For 4 e d.c. machine…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

A 3-phase, 50 Hz, oil cooled core type transformer has the following dimensions: Distance between core centres = 0.2 m, Height of window = 0.24 m Diameter of circumscribing circle = 0.14 m. The flux density in the core- 1.25 Wb/m². The current density in the conductor 2.5 A/mm². Assume a window = space factor of 0.2 and the core area factor 0.56. The core is 2-stepped. Estimate kVA rating the transformer
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In no load phasor diagram of practical transformer, the magnetizing current is with flux 4. In phase 90 Degree out of phase Lagging by 60 Degrees Leading by 60 Degrees
For the design we assuming following parameters 1) winding : Lap 2) simplex 3) Number of slots : 16 , single turn coil with 2 conductors per slot 4) Number of poles = 4
4. The portion of the flux that goes through one of the transformer coils but not the other one is called. A) Average flux C) Total flux B) Mutual flux D) Leakage flux 5. The ------- are represented in the induction motor equivalent circuit by the resistor Rc (or the conductance Gc). A) Stray losses. C) Air-gap losses B) Friction and windage losses D) Core losses 6. The per-phase voltage Vo can be calculated by dividing the total voltage on. A) √3 B) √1.404. C) √0.707. D) √2.
Laminated insulations coated with varnish are normally used in the transformer? A. to reduce reluctance of magnetic path B. to reduce the effect of eddy current C. to increase the reluctance of magnetic path D. to reduce the hysteresis effect
6- The transformer emf can be obtained by (a)By having a time-varying loop area in a static B field (b)By having a stationary loop in a time-varying B field (c) By having a time-varying loop area in a time-varying B field (d)None of the above
In magnetic circuits, the core is often made of laminated magnetic material. What are the benefits of using a laminated magnetic core? Select ALL that apply: 1. Laminations reduce the effective cross section of material which eddy currents form in 2. Laminations work better for high frequencies 3. Eddy current losses are decreased by the inclusion of laminations 4. Eddy current losses are increased by the addition of laminations in the core 5. Core losses are better reduced by phase shifting the input voltage by 180 degrees
List the materials used for construction of following parts (1) commutator (2) Transformer core (3) Yoke of DC machine (4) Armature and field winding
What type of power losses does windage lods, bearing and brush friction is consid3red? a. stray losses b. armature losses c. core losses d. copper losses

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