Q1) A 6-pole lap-wound DC Shunt Motor has a 220 V supply. The armature has 600 conductors and a resistance of 0.8 ohm. If the useful flux per pole is 0.1 Wb and the armature conductor current is 4 A, calculate (a) the speed and (b) the torque developed. Q2) A Separately excited DC Motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply and a field resistance of 100 ohm. If the armature is stationary then the armature voltage dron is

Q1) A 6-pole lap-wound DC Shunt Motor has a 220 V supply. The armature has 600 conductors and a resistance of 0.8 ohm. If the useful flux per pole is 0.1 Wb and the armature conductor current is 4 A, calculate (a) the speed and (b) the torque developed. Q2) A Separately excited DC Motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply and a field resistance of 100 ohm. If the armature is stationary then the armature voltage dron is

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

Q/ A 250 V dc series motor having armature and field resistance 0.25 ohm and 0.15 ohm respectively runs, at 800 rpm, while taking 50 A from the supply. Assuming the magnetic circuit of the motor to be unsaturated, determine its speed, when a divertor of 0.3 ohm resistance is connected in parallel with the field winding of the motor, which is subjected to a load torque whose torque (a) remains constant regardless of speed, (b) varies in direct proportion to the speed, (c) varies as the square of the speed.
a dc shunt motor runs at 900 r.p.m from a 460 V supply when taking an armature current of 25 A. Calculate the speed at which it will run from a 230 V supy when taking an armature current of 15 A . The resistance of the armature circuit is 0.8 ohms . Assume the flux per pole at 230 V to have decreased to 75 % of its value at 460 V .
A 4 pole, 250 V, DC shunt motor has a lap connected armature with 960 conductors. The flux per pole is 2x10-2Wb. Calculate the torque developed by the armature and the useful torque in Nm when the current taken by the motor is 30 A. The armature resistance is 0.12 ohm and the field resistance is 125 ohm. The rotational losses 825 W.
A 500 V shunt motor has an armature resistance of 0.1 ohm shunt field resistance of 125 ohms. Find the resistance of the shunt field regulator to increase the speed from 750 r.p.m, to 1000 r.p.m if the current taken by the motor is 500 A. Assume the magnetization characteristic to be a straight line.
The armature winding resistance of a long shunt connected DC generator is 0.4ohm, the resistances of the shunt and serial field windings are 125 ohms and 0.1 ohms, respectively. While the generator supplies 8KW of power to the load it feeds, which is the voltage it produces since the output voltage is 250V?
The armature winding of a 4-pole, 250-V DC shunt motor is lap connected. There are 130 slots, each slot containing 8 conductors. The flux per pole is 30 mWb and the current taken by the motor is 35-A. The resistance of armature and field circuit are 0.25 and 150 ohms respectively. If the rotational losses amount to 750W. Determine the (a) gross torque in N-m, (b) useful torque in N-m and (c) the efficiency.
(use 2-decimal digits for solutions) A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors anduseful flux/pole of 20 mWb. The armature and field resistances are 0.5 Ω and 250Ω respectively. What will be the speed and torque developed by the motor when itdraws 20 A. from the supply mains? If the magnetic and mechanical losses amountto 900 W., find (a) useful torque, (b) output in kW, and (c) efficiency at this load.
A short-shunt compound DC generator supplies a current of 100 A at 220 V. If the resistance of the shunt field is 50 ohms, of the series field 0.025 ohms, of the armature 0.05 ohm, the total brush drop is 2 V and the iron and friction losses amount to 1 kW, determine the following: The armature current, Amp The generated voltage, V The copper losses, W The output power of the prime mover, kW The generator efficiency, %
A dc series motor operates at its full rated load at 1500 rpm. The line condition are 125 V and 10 A. The motor has an armature circuit resistance, including the commutating field, of 1.25 ohms and a series field resistance of 0.425 ohms . Assuming that the field flux changes linearly with field current, what will be the motor speed if the load is such that the line current drops to 6.25 A?
A 500 V shunt motor has an armature resistance of 0.1 ohm shunt field resistance of 125 ohms. Find the resistance of the shunt field regulator to increase the speed from 750 r.p.m, to 1000 r.p.m if the current taken by the motor is 500 A. Assume the magnetization characteristic to be a straight line. (Ans. 41.7 ohm)
A dc shunt motor runs at 900 rpm from a 460 V supply when taking an armature current of 25 A. Calculate the speed at which it will run from a 230-V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 Ω. Assume the flux per pole at 230 V to have decreased to 75% of its value at 460 V.
Q/ A de series motor on load operating at 250 V dc mains draws 25 A and runs at 1200 rpm. Armature and field resistances are 0.1 ohm and 0.3 ohm respectively. A resistance of 25 ohms is placed in parallel with the armature of the motor. Determine: (a) The speed of the motor with the shunted armature connection, if the magnetic circuit remains unsaturated and the load torque remains constant, and (b) the no load speed of the motor with the shunted armature connection.