The flux o in a 18 KW, 120 V, Duplex Lap-Wound DC machine has been set to induce rated voltage at a speed of 1500 RPM. Find the product Ko, and find the induced torque in this machine at no load. Select one: a. Product = 0.764, and Induced Torque = 114.6 N.m O b. None Oc. Product = 0.764, and Induced Torque = 0 N.m O d. Not enough information is given to find the torque WEXT

The flux o in a 18 KW, 120 V, Duplex Lap-Wound DC machine has been set to induce rated voltage at a speed of 1500 RPM. Find the product Ko, and find the induced torque in this machine at no load. Select one: a. Product = 0.764, and Induced Torque = 114.6 N.m O b. None Oc. Product = 0.764, and Induced Torque = 0 N.m O d. Not enough information is given to find the torque WEXT

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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Similar questions

A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors and useful flux/pole of 20 mWb. The armature and field resistances are 0.5 Ω and 250 Ω respectively. What will be the speed and torque developed by the motor when it draws 20 A. from the supply mains? If the magnetic and mechanical losses amount to 900 W., find (a) useful torque, (b) output in kW, and (c) efficiency at this load.
(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.
Suppose that we are designing a 1200-rpm dc motor to run from a 240-V source. We have determined that the flux density will be 1 T because smaller fluxes make inefficient use of the iron and larger fluxes result in saturation. The radius of the rotor (and thus, the torque arm for the armature conductors) is 0.1 m. The lengths of the armature conductors are 0.3 m. Approximately how many armature conductors must be placed in series in this machine?
At what speed, in rpm, must the armature of a dc machine run to develop 572.4 kW at a torque of 4605 n-m?
A 4-pole dc motor is lap-wound with 480 conductors. The average flux density and the cross - sectional area over one-pole-pitch are 0.4 T and 16m2 respectively. Find the torque developed when the motor is drawing 30A and running at 1500 rpm.
An 8-pole DC machine has a simplex wave-wound armature containing 200 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.004 Wb. What is the internal resistance of the armature in ohms? What is the current absorbed by this machine in amperes at the instant it's connected to a 100 Vdc source? What is the internally generated torque produced by the armature of this machine in N-m at the instant it's connected to the 100 Vdc source? With the DC machine connected to the 100 Vdc source, what is the steady state angular speed of the machine in rpm? What is the internally generated voltage of the armature of this machine at steady state in volts?
A 230 V dc machine has an emf constantand . The field is separatelyexcited and produces 0.01 Wb per pole. for all parts ofthe problem. (a) At what speed does the machine operate as adc generator with rated terminal voltage? (b) At what speeddoes the machine operate as a dc motor with rated terminalvoltage? (c) If an external resistance is added in serieswith the armature circuit, at what speed does the machineoperate as a dc motor with rated terminal voltage? (d) If themotor of part (b) is known to be supplying 10 HP to a coupledmechanical load, determine the rotational losses at the point ofoperation ***Any two branches please do not be late
Q1) A 4-pole, separately excited, wave wound DC machine with 0.12 armature resistance is rated for 230 V and 5 kW at a speed of 1200 rpm. If the same armature coils are reconnected to forms a lap winding, what is the power (in kW) at 1200 rpm of the reconnected machine if the field circuit is left unchanged? Also voltage regulation in both cases
Q1) A 4-pole, separately excited, wave wound DC machine with 0.12 armature resistance is rated for 230 V and 5 kW at a speed of 1200 rpm. If the same armature coils are reconnected to forms a lap winding, what is the power (in kW) at 1200 rpm of the reconnected machine if the field circuit is left unchanged? Also calculate the voltage regulation in both cases
A separately excited D.C motor is rated for a full load torque of 100Nm. For an applied voltage of 240V and for flux (φ) per pole of 30 mWb, the no-load and full load speeds of the motor are 1595 r.p.m and 1195 r.p.m respectively. (a) Find the armature resistance (b) If the applied voltage and the flux per pole are reduced to 200V and 20mWb respectively, Find the corresponding full load speed.
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.
A 110V shunt generator has a full load current of 100A, shunt field resistance of 55 ohms and constant losses of 500W. If full load efficiency is 88%, find the armature resistance. Assuming voltage to be constant at 110V, calculate the efficiency at half load. Find the load current.