If we need to use a DC generator witha very good voltage regulation wechoose: *DC Generators cannot give very good Voltage RegulationSeparately-Excited DC GeneratorSelf-Excited Shunt wound DC GeneratorSelf-Excited Series wound DC Generator

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Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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Similar questions

Induction motors and welding transformers require magnetizing current, which causes a. lagging power factor. b. leading power factor. c. unity power factor. d. zero power factor.
10/ The series field winding of DC Machine has many turns of thick wire Select one: True False
A short-shunt compound wound generator has a full-load current of 40 amperes. If the series field resistance is 0.04 ohms and a diverter carries a 20 amperes, what is the diverter resistance? note: A diverter is a low value resistor connected in parallel with the series field of a DC machine.Please include detailed solution and formula. Thanks.
Two dc shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohms run in parallel and supply a total current of 1000 A to the load circuit. If their emf's are 270 V and 265 V, solve the bus bar voltage. Subject:Electrical Machine 1
A d.c. series motor draws 25 A from a 260 V line while running at 900 rpm. It has an armature resistance of 1.5 Ω and a series field resistance of 0.8 Ω. A diverter is to be added to the circuit so that the speed increases to 1200 rpm while the line current increases to 30 A. Find the value of the diverter resistance Rd . a) find the Rd mathmatically
The 50kW, 500V short compound DC generator has an armature resistance of 0.06 Ohms, a series field resistance of 0.04 Ohms and a shunt field resistance of 125 Ohms. The voltage loss on the brush is 2 V. Calculate the armature induced voltage at the load of the twig
During stator voltage control of Induction motor drives, Relationship of Torque (T) with Vrms is given by a. T∝1/Vrms2 b. T∝1/Vrms c. T∝Vrms d. T∝Vrms2
Q4. A synchronous generator with a synchronous reactance of 1.5 p.u. is connected to an infinite bus whose voltage is 1 p.u. The maximum permissible power output is 1.2 p.u. (a) Compute the excitation voltage. (b) The power output is gradually reduced to 0.7 p.u. with fixed field excitation. Find the new current and power angle δ. Q5. Compute the reactive power generated by the machine of problem Q4 under part (b). If the machine is required to generate a reactive power of 0.4 p.u. while supplying the same active power by changing the field excitation, find the new excitation voltage and power angle δ. answer Q5
A short - shunt compound generator supplies 100 A at 110 V. Armature resistance = 0-05 ohm ; shunt field resistance = 57 ohm; series field resistance = 0.04 ohm. Iron and frictional losses amount to 852 W. Find ) generated e.m.f. ( it ) total Cu losses ( til ) overall efficiency .
No. 8 problem A shunt generator has the following open-circuit characteristic at 800 r.p.m. Field amperes : 0.5 1.0 1.5 2.0 2.5 3.0 3.5E.M.F. Volt : 54 107 152 185 210 230 245 Armature and shunt field resistances are respectively 0.1 Ω and 80 Ω. The terminal p.d. falls to 175 V when the armature current is 100 A. Find the O.C. volts and the volts lost due to (i) reduction in the field current(ii) armature resistance (iii) armature reaction.
Determine the voltage regulation of a 2,000-V, 1-phase alternator giving a current of 100 A at 0.8 p.f. leading from the test results. Full-load current of 100 A is produced on short-circuit by a field excitation of 2.5 A. An e.m.f. of 500 V is produced on open-circuit by the same excitation. The armature resistance is 0.8 Ω . Draw the vector diagram
An 8-pole dc generator with 778 wave connected armature conductors and running at 500 rpm supplies a load of 12.5 ohms resistance at a terminal voltage of 50V. The Ra = 0.24 ohm and Rsh = 250 ohms. Find the flux per pole.

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If we need to use a DC generator witha very good voltage regulation we choose: * DC Generators cannot give very good Voltage Regulation Separately-Excited DC Generator Self-Excited Shunt wound DC Generator Self-Excited Series wound DC Generator