Q6: Choose the correct answer, (answer five only): 1-The slip-rings in an AC gen.provide means of: (a)connecting an external circuit to a rotating armature inding ((b) periodically reversing the current produced by an armature winding (c) supporting a rotating armature without the need for bearings 2-The rotor of an AC induction motor consists of: ((a) a single copper loop which rotates inside the field created by a permenent magnet (b)aseries of coil windings on a laminated iron core with connections via slip-rings (c) aliminated iron core inside a squirrel cage made from copper or aluminuim 3-In a balanced star-connected three-phase system the line evurrent is a 2 A and the lin voltage is 220 V.If the power factor 0.75 which one of the folowing gives the total powe in the load? (a)520W ((b)271W (c)900W 4-E, for a shont d.c gen.is.... (a)V₁-1,Ra (b)V₁-L(R+R) (c)V₁¹1₂R₂ 5-The induced e.m.f. in DC gen. depends on: (a)field coil (b)current

Q6: Choose the correct answer, (answer five only): 1-The slip-rings in an AC gen.provide means of: (a)connecting an external circuit to a rotating armature inding ((b) periodically reversing the current produced by an armature winding (c) supporting a rotating armature without the need for bearings 2-The rotor of an AC induction motor consists of: ((a) a single copper loop which rotates inside the field created by a permenent magnet (b)aseries of coil windings on a laminated iron core with connections via slip-rings (c) aliminated iron core inside a squirrel cage made from copper or aluminuim 3-In a balanced star-connected three-phase system the line evurrent is a 2 A and the lin voltage is 220 V.If the power factor 0.75 which one of the folowing gives the total powe in the load? (a)520W ((b)271W (c)900W 4-E, for a shont d.c gen.is.... (a)V₁-1,Ra (b)V₁-L(R+R) (c)V₁¹1₂R₂ 5-The induced e.m.f. in DC gen. depends on: (a)field coil (b)current

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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A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding consists of 220 turns each of 0.004 2 resistance, when running at 900 RPM the armature current is 50 A. If the armature winding reconnected as lap calculate the terminal voltage in case of wave and lap given that the field circuit and the speed are kept same.
Q8) A two-pole de generator has an armature containing a total of 40 conductors connected in two parallel paths. The flux per pole is 0.02 web, and the speed of the prime mover is 30 rpm. The resistance of each conductor is 0.01 ohm, and the current-carrying capacity of each conductor is 10 A. Calculate: (a) The average generated voltage per path and the generated armature voltage (b) The armature current delivered to an external load (c) The armature resistance (d) The terminal voltage of the generator.
(B)-ndicate whether the following statements are true or false and correct the faise statements. -When a series d.c. motor is operate without load, the armature will not run. The strength of magnetic field in d.c. shunt generator can be varied by varying the polarity of the field poles The main disadvantage of series generators is Output voltage varies as the Toad varies There is no output from the transformer under short-circuit conditions
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
Which one of the following is not the function of pole shoes in a dc machine? (1) To reduce eddy current loss (2)To support the field coils (3)To spread out flux for better uniformity (4)To reduce the reluctance of the magnetic path (5)None of the above.
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A 4-pole alternator runs at 1,200 RPM. There are 10,000 kilolines per pole. (a) Determine the effective voltage built up for each full pitch armature coil of one turn if the flux distribution in the air gap is sinusoidal. (b) Suppose that the armature coil is short 30 electrical degrees of being full pitch, what will be the effective voltage per coil? (a) What is the pitch factor for this winding? Ans. 17.76V; 17.15V; 0.966
With the aid of diagrams describe the basic topology of a wound field 3 phase synchronous generator and outline the relationship between the excitation voltage and rotor current. Q2 (a) (b) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) generator to a stand alone DC system. A star connected 3 phase wound field synchronous generator with a synchronous reactance of 20 N is connected to a 6.6 kV (phase voltage) grid and supplies 1.5 MW at 0.95 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8). (c) The load is now increased to 3 MW with the Excitation Voltage kept constant. Using the phasor diagram drawn in part (c) graphically determine the resultant phase current, power factor and load angle. (d)
For a 4-pole dc armature with 28 slots and 8 coil-sides per slot, find the winding pitches and the commutator pitch for a wave winding. What is the distance between brushes in terms of commutator segments?
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