10. Two identical 5 kW, 220 V, 24 A dc shunt machines are to be used as the gene-rator and motor in a Ward-Leonard system. The armature resistance of eachmachine is 0.5 ohm and the magnetization curve for each machine at 1500 rpmis given below:Field current, AInduced emf, V0.2800.40.60.81.01.21.4160 210228237243 247The generator is driven at a constant speed of 1500 rpm.(a) Determine the maximum and minimum values of the generator field currentrequired to give the motor a speed range of 100 rpm to 1500 rpm at full loadarmature current of 24 A, with the motor field current held constant at 0.6 A.(b) Determine the maximum motor speed obtainable at full load armature currentif the motor field current is reduced to 0.10 A and generator field current isnot allowed to exceed 1.2.A.

(a) The maximum and minimum generator field currents required are 2 A and 2 A respectively. (b) The…

Answered: 10. Two identical 5 kW, 220 V, 24 A dc…

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 120 V shunt generator running at 850 rpm has its armature and shunt field resistance of 0.15 ohm and 50 ohm respectively. It supplies 200 lamps each rated at 60 W, 100 V. The friction and windage and core loss of the machine is 400 W. its armature copper * loss on full load and shunt field loss is 2156.7 W, 240 W 2232.6 W, 240 W O 2232.6 W, 200 W 2156.7 W, 200 W O
) A d.c. shunt machine while running as generator develops a voltage of 240 V at 1000 rp.m. on no-load It has armature resistance of 0.52 and field resistance of 250 92. When the machine runs as motor, input to it at no-load ts 4 A at 240 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 240 V. Armature reaction weakens the field by 6%
4. What for brushes are employed in DC generator? 5. What is the function of armature in a DC generator? 6. What is the function of commutator in a DC machine in generator action. 7 Whieh diffe u0ad in
A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *
A 4 pole machine running at 1500 rpm has an armature with 90 slots and 6 conductor per slot. The flux per pole is 10mWb. Determine the terminal emf as DC generator if the coils are lap connected. If the current per conductor is 100A, determine the electrical power.
An 8 pole, lap connected armature has 500 conductors and its generated e.m.f is 120V. If the flux per pole is 20 mWb, then the speed of machine is, (a) 105 rpm (b) 420 rpm (c) 180 rpm (d) 720 rpm
4) A dc. ahunt machine while running as generator develops a voltage of 240 V at 1000 rpm. on no-load It has armature resistance of 0.5 12 and field resistance of 250 2. When the machine runs as motor, input to it at no-load ts 4 A at 240 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 240 V. Armature reaction weakens the field by 6%
A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 2 and 44N respectively. The stray losses are 375 W. What is percentage efficiency of the DC generator
55. Calculate the voltage induced in the armature winding of a 4-pole, lap wound, dc machine having 728 active conductors and running at 1800 rpm. The flux per pole is 30 mWb.a. 655.2 Vb. 493.6 Vc. 545.4 Vd. 385.2 V
An eight-pole, 24 KW, 124 V, DC machine has a duplex LAP-wound armature which has 72 coils with 6 turns per coil. Its rated speed is 3000 RPM. Assume no dead zone Find the constant K and the flux per pole to produce the rated voltage at no-load conditions Select one: O a. K = 68.76 and flux = 5.71 mWb / pole O b. K = 86.76 and flux = 4.55 mWb / pole O c. K = 78.86 and flux = 5.33 mWb/pole O d. None
An 8- pole dc generator has 500 armature conducters and a useful flux of 0.05 Wb. A. What will be the emf generated, if it is lap- connected and runs at 1200 rpm? B. What must be the speed at which it is to be driven to produce the same emf if it is wave wound.
A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above

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