Q.3: A 250 V DC shunt motor has armature resistance of 0.25. It takes an armature current of 50 A and runs at 750 r.p.m. If the flux of the motor is reduced by 10% without changing the load torque, find: (i) The new speed of the motor (ii)The developed torque.

Q.3: A 250 V DC shunt motor has armature resistance of 0.25. It takes an armature current of 50 A and runs at 750 r.p.m. If the flux of the motor is reduced by 10% without changing the load torque, find: (i) The new speed of the motor (ii)The developed torque.

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

Related questions

Q: Q/ A d.c. series motor drawn 38 A at 218 V and runs at 910 r.p.m. If the armature and field…

A: In this question we will find the the armature develop torque and efficiency of DC series motor.

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A: Given: Current, IL=100A, Resistance, Ra=0.04ΩRsh=115ΩRse=0.01Ω Voltage, V=230V

Q: 3Electromechanics

Q: A- A d.c. series motor draws 22 A from a 240 V line while running at 840 rpm. It has an armature…

Q: A 24 KW, 140 V, Duplex Lap-Wound DC machine has been set to induce rated voltage at a constant K…

Q: DC series motor

A: For the DC series motor, Ise=Ia =Ia Flux, conductor, poles, armature resistance values given in…

Q: A four-pole Shunt connected generates 120 V. If the generator supplies an incandescence lamp (100V,…

Q: Question- A 220 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2…

A: Given data- 220 V DC machine, 20 A at 200 V generator, Ia=20 A, Armature resistance- Ra=0.2 Ω, Flux…

Q: A dc motor has an electrical power of 150W, speed of w=30rad/s, and a torque of 3N-m. The efficiency…

A: given Input power= 150W w=30 rad/sec torque,τ=3 N-m

Q: A long shunt generator running at 1000 RPM supplies 20 kW at a terminal voltage of 220 V. The…

Q: A 220 V DC shunt motor draws a current of 20 A and rotates at a speed of 1783 r.p.m. The armature…

A: Torque developed by motor =( power developed )×60/(2×pi×speed). Simillarly we will calculate output…

Q: . series motor when loaded to 50 A runs at 1500 r.p.m. on a 220 V supply. The motor resistance is…

Q: a dc shunt motor runs at 900 r.p.m from a 460 V supply when taking an armature current of 25 A.…

A: Take the ratio of back emfs to find the speed at terminal voltage of 230 volts. Back emf is directly…

Q: A 250 V, 8-poles lap wound D.C. shunt motor has an armatre resistance of 0.5 N and shunt field…

Q: The field and armature resistances of a 220-V series dc motor are 0.2 ohms and 0.1 ohms…

Q: A 240 V series lift motor has resistance of 0.2 ohm. At the speed of 1800 r.p.m. it takes 40 A. Find…

Q: A 220 V permanent magnets DC motor has an armature resistance of 0.502. If the full load armature…

A: Given data, Terminal voltage V = 220 V. Armature resistance Ra=0.5 Ω. Armature current Ia=20 A.

Q: A de electrical shunt motor rated 50 kW connected to a 250 V supply is loaded as to draw 200 A when…

Q: 5. A 230V series motor with 4-pole, 600 conductors wave-connected supplying a load of 7.5kW by…

Q: A 50 h.p, 440 V d.c. A shunt motor draws a current of 104 A from the mains when running at full…

Q: A 600 V small traction motor is used in street car operation is rated at 50 hp and 760 rpm. This…

A: DC Machine Losses include iron Loss (Hysteresis and eddy loss) Cu Loss (shunt, series, armature…

Q: 3. A series motor having a series field resistance of 0.25 2 and an armature resistance of 0.152 is…

Q: A 24 KW, 140 V, Duplex Lap-Wound DC machine has been set to induce rated voltage at a constant K…

Q: d.c. shunt motor

Q: . Explain the self excited DC Shunt generator with its voltage equation

A: The shunt generator divided in two parts, self-excited dc shunt generator separately excited dc…

Q: A 250V series motor runs at 500 rpm at rated load current of 75 A. The armature circuit has a…

A: It is given that: V=250 VN1=500 rpmIL1=Ia1=75 ARa+Rse=0.2 Ωϕ α Ia

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

Q: Justify why an electrostatic motor cannot be operated from dc supply. Derive the expression of…

Q: A DC series motor is running with 1000 rpm and induced voltage of 150V , find the speed when the…

A: This question belongs to d.c. machine . It is based on the concept of d.c. series 's induced e.m.f.…

Q: V DC separately excited motor has ure resistance 2 ohms and voltage constant V /rad/s. The field…

A: Note: As the question data is incomplete, still i am trying to solve it by taking some random data.…

Q: A dc motor has a back emf of 110 V and an armature current of 90 A when running at 1500 rpm. Find…

A: Given: Back emf = 110V Armature Current = 90A speed = 1500rpm. The torque can be calculated by using…

Q: A 220 V permanent magnets DC motor has an armature resistance of 0.5 0. If the full load armature…

A: Given data, Terminal voltage V = 220 V. Armature resistance Ra=0.5 Ω. Full load armature current…

Q: ·A 4-pole, 250-V, d.c. shunt motor has a lap-connected armature with 960 conductors. The flux per…

A: Given: A DC shunt lap connected motor has: Poles, P=4 Voltage, V=250 V Number of conductors, Z=960…

Q: A 5 kW 125 V shunt generator operates at 1800 r/min If the field current is 1.8 A and the armature…

A: Output power Terminal voltage Field current Armature resistance

Q: A separately excited dc generator when running at 1200 rpm supplies 200 A at 125 V to a circuit of…

Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

Q.3: A 250 V DC shunt motor has armature resistance of 0.25. It takes an armature current
of 50 A and runs at 750 r.p.m. If the flux of the motor is reduced by 10% without
changing the load torque, find:
(i) The new speed of the motor
(ii)The developed torque.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Introduction

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A 4-pole series motor has 800 lap connected armature conductors. At a certain load, the flux per pole is | 60mWb and the total mechanical torque developed is 400 N-m. Calculate the line current taken by the motor and the speed at which it will run with a back emf of 400 V. Total motor resistance is 4 ohm.
Q3. Write if the shown statements are TRUE or FALSE. 1- In DC machine the induced e.m.f is proportional with flux only. 2- The Ta/l a graph of a d.c. series motor is a straight line throughout. 3- In a DC motor the direction of the shaft rotation can be change by changing the polarity of the power supply. 4-The critical resistance is less than armature resistance in shunt generator. 5-As the load is increased, the speed of a d.c. shunt motor increases slightly.
A shunt generator delivers 195 A at a terminal voltage of 250V. The armature resistance and the shunt field resistance are 0.02 and 50 ohms, respectively. The iron and the friction losses are equal to 950 W. Find the commercial efficiency of the generator.
Subject: Electrical Machines
Problem-7 A permanent magnet DC motor has an armature resistance of 1 2 and when a voltage of 240 V is applied to the motor it reaches a steady-state speed of rotation of 40 rev/s and draws 80 A. Find the following; a) b) The power input to the motor. The power loss in the armature. The torque generated at that speed. c)
A motor’s rotor spins at 1,000 rpm when no load is applied (i.e. torque = 0), but reduces to 900rpm when the rated torque of 2.3 N-m is applied. Determine the speed regulation and output horsepower at the rated load condition. If the motor’s input power is 500 Watts at the rated load condition, what is the efficiency?