Q2. A 200V, 4-pole, wave connected shunt motor with 600 conductors in it is armature slots. The armature and shunt field resistance are 0.50 and 200Q respectively. If the input power drawn from the mains is 8000 w and the iron and friction loss power is 960.5 w.(use flux per-pole 0.0 25Wb and brushes drop may be neglected) A- Calculate the gross torque developed by the armature, the shaft torque (useful), and the lost torque. B- Calculate the gross power developed by the armature, mechanical efficiency, electrical efficiency, and the overall efficiency. Calcultae also the maximum efficinct. Armature reaction may be neglected. (comment on your result)

Q2. A 200V, 4-pole, wave connected shunt motor with 600 conductors in it is armature slots. The armature and shunt field resistance are 0.50 and 200Q respectively. If the input power drawn from the mains is 8000 w and the iron and friction loss power is 960.5 w.(use flux per-pole 0.0 25Wb and brushes drop may be neglected) A- Calculate the gross torque developed by the armature, the shaft torque (useful), and the lost torque. B- Calculate the gross power developed by the armature, mechanical efficiency, electrical efficiency, and the overall efficiency. Calcultae also the maximum efficinct. Armature reaction may be neglected. (comment on your result)

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...

See similar textbooks

Similar questions

a shunt-wound motor runs at 600 r.p.m from a 230 V supply when taking a line current of 50 A. its armature and Field resistance are 0.4 ohms and 104.5 ohms respectively. Neglecting the effects of armature reaction and allowing 2 V brush drop, calculate (a) the no-load speed if the no-load line current is 5 A. (b) the resistance to be placed in armature circuit in order to reduce the speed to 500 r.p.m when motor is taking a line current of 50 A . (c) the percentage reduction in the flux per pole in order that the speed maybe 750 r.p.m when the armature is 30 A with no added resistance in the armature circuit.
A series dc motor 20-hp, 500-V, is having armature, series field and shunt field winding resistances of 0.08 Ω, 0.3 Ω and 125 Ω, respectively. If the back – emf is 478 V, determine the motor current when the connection is a) long – shunt. b) short – shunt c) series d) shunt
A 220v dc shunt motor takes a total current of 80A and runs at 800r.p.m. Shunt field resistance and armature resistance are 50ohm and 0.1ohm respectively. If the iron and friction losses around to 1600w, find 1.copper losses 2.armature torque 3.shaft torque 4.efficiency
For a certain load and a constant terminal voltage VT of 230 V, DC shunt motor takes an armature current of 20 A. The armature resistance is 0.5 Ω. Rotation and ohmic losses can be neglected. Find the resistance required in series with armature to reduce the speed by 50% of the original motor speed if: a) The load torque TL is constant. b) The load torque is not constant but is proportional to square of the motor speed, i.e. TL = kT × ω2
1- A 10kW, 200V, DC Shunt motor has 1-ohm armature resistance. At the starting of the motor, its back emf (Eb) is zero.Select one:TrueFalse 2- Identify which of the following loss is not varying with respect to load current? a.Iron loss b.Both Armature and Series field copper losses c.Series field Copper Loss d.Armature Copper Loss
A separately excited dc motor has the following parameters: 220 V, 10 A, 1,400 rpm, armature resistance = 2.3 Ω, field excited at rated current. When the armature is open-circuited and rotated at 1,500 rpm by a prime mover, the armature voltage was 250 V. If the motor is now supplied at rated voltage and if it carries 5.6 A armature current, what will be the approximate load torque on the shaft?
A 220 V, 4-pole lap wound dc shunt motor has 800 conductors and has a filed resistance of 220 ohm. The motor takes a line current of 15 A at full load and rated speed. Find the additional resistance required in the field winding if the speed of the motor is to be raised by 20 % while maintaining its torque output at previous full load value. Assume linear magnetic circuit for the machine and the resistance of each armature conductor as 40 mohm
A 440V, A-connected, 60Hz four-poles SM has an armature resistance of 0.229 and synchronous reactance of 30. When this motor is supplying 100hp at 0.8 PF leading, its Plosses 9.2kW. 1. Find I, I, and EA 2. Find efficiency at rated conditions. 3. Calculate the output torque of this motor at the rated conditions. 4. If the flux is decreased by 10%, find the torque angle, the armature current, and the PF.
The equivalent circuit parameters of a 230-V, 1-phase, 6-pole, 60-Hz induction motor are: R1 = R2’ =10ohm, X1 = X2’ = 10ohm, and Xm = 100ohm. At a slip of 5%, calculate the developed torque and The input power to the motor at 230V, while running on no-load, is 31.4 W at 1.2 A. What is the approximate efficiency of the motor at 5% slip?
A 4-pole, 240-V., wave-connected shunt motor gives 11.19 kW whenrunning at 1000 rpm and drawing armature and field current of 50 A.and 1.0 A. respectively. It has 540 conductors. Its resistance is 0.1 Ω.Assuming a drop of 1 volt per brush, find (a) armature torque, (b) shafttorque, (c) rotational losses, and (d) efficiency.
A 4 pole, 220V dc shunt motor takes 32A from the supply mains and develops a power of 5.6KW in its armature. The field winding and armature resistances are 220ohms and 0.09ohm respectively. It has 540 lap wound conductors. If the flux per pole is 30mWb, calculate the torque developed in lb-ft.
a 220v dc shunt motor takes 5a and 40a at no load and full load respectively it has an armature resistance of 0.2 ohm and field resistance of 110 ohm respectively. iron,friction and windages losses are negligible.then using among parameters find following. calculate emf at full load of dc motor