Write the solution neatly. A 230 V d.c. shunt motor, having an armature resistance of 0.05 ohm and a fieldresistance of 75 ohms, draws a line current of 7 A while running light at 1120 rpm. Determine the motor efficiency when the line current at a given load is 46 A. Answer % = 83.92 %

Write the solution neatly. A 230 V d.c. shunt motor, having an armature resistance of 0.05 ohm and a fieldresistance of 75 ohms, draws a line current of 7 A while running light at 1120 rpm. Determine the motor efficiency when the line current at a given load is 46 A. Answer % = 83.92 %

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

See similar textbooks

Related questions

Q: A 220 V dc shunt motor takes 4A at no load when running at 700 rpm. The field resistance is 100…

Q: A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the…

A: The solution is given below

Q: pole, 240 V, wave connected shunt motor gives 1119 Kw, when running at 1000 r.p.m. and drawing…

Q: DC motor is shunt excited. It has a rated voltage VT, rated out put power Pout and rated speed Nout.…

Q: A d.c. shunt motor runs at 900 r.p.m. from a 400 V supply when taking an armature current of 25 A.…

Q: A 220 V shunt motor has armature and field resistances of 0.5 Q and 220 Q respectively. Initially,…

Q: A 240 V d.c. shunt motor runs at 700 r.p.m. ,takes 12kW. Find resistance to be added to the field…

Q: Find the number of resistance sections and the resistance of each section of a starter for a 3.7 kW,…

Q: 2. Ad.c. motor has a speed of 900 rev/min when connected to a 460 V supply. Find the approx- imate…

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 armature and shunt field resistance of a 600 V shunt motor are 1.5 ohm and 600 ohms…

Q: The field windings of the series motor have a resistance of 120 ohms at 15-degree C. After running…

Q: 10. A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At…

Q: A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field resistance of 0.18…

A: In tbe question A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field…

Q: 3. A compound motor develops a torque of 271 lb-ft when it is operating at 1200 rpm, under which…

Q: 1. Calculate the no load speed of a DC motor with specs 12V Vdc KE=0.1 and flux of 2Wb

A: In the question 1. We need to Calculate the no load speed of a DC motor with specs 12V Vdc KE=0.1…

Q: A DC series motor having a resistance of 0.4 n and runs at 2000 rpm when connected to 250 V supply…

Q: 250 V d.c. shunt motor runs at 800 r.p.m. ,takes 12.5kW. Find resistance to be added to

Q: A belt-driven 202 Hp shunt wound DC generator is running at 465 rpm and is supplying full load to a…

A: Given Belt driven Shunt compound DC generator of output P0= 202 Hp The speed N=465 rpm The busbar…

Q: A shunt motor by means of a prony brake having a length arm of 3.5 feet and a tare weight of 5.7…

A: According to the question we have to find the value of rotational loss.

Q: Determine the overall efficiency of the machine if long shunt compound motor draws a line current of…

A: Input power = terminal voltage × Line current. Power developed = back emf × armature current.…

Q: A DC series motor having a resistance of 0.4 a and runs at 2000 rpm when connected to 250 V supply…

A: N1 = 2000rpmV=250VRin = 0.4ΩFor series motor,IL = Ia = Ise = 20A Back EMF = Eb=V-IaRa=250-20×0.4 =…

Q: A 230 V D.C. shunt motor takes 32 A at full load. The back e.m.f. on full load, if the resistance of…

Q: The terminal voltage of a motor is 118 V, and the armature current is 38 A. If the armature…

Q: Re Q2 // A series motor has an armature resistance of (0.4 92 ) and a series field resistance of (…

Q: A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has…

Q: A 500 V, lap wound d.c. A shunt motor has 90 slots and each has 8 conductors. When the motor…

Q: A 220-V shunt motor has an armature resistanceof 0.32 Ω and a field resistance of 110Ω . At no…

A: Given V=220 VRa=0.32 ΩRf=110 ΩIa=6 AN=1800 rpm (a) The speed of the DC shunt motor is given by…

Q: A belt-driven 150 kW shunt wound DC generator is running at 500 rpm and is supplying full load to a…

Q: A series motor, working on 500 V d.c. supply, runs at a speed of 1000 r.p.m when load current is 120…

A: Given : V=500 V N1=1000 rpm IL1=120 A Ra+Rf1=0.15 ohms Rf1=0.04 ohms Rd=0.08 ohms

Q: If the losses of the armature wingdings of dc motor which is running at 1200 RPM is neglected and…

Q: A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the…

A: We need to find out Speed of motor .

Q: The overall efficiency of a 4-pole DC motor is 83.5% when running at a speed of 550 rpm. The motor…

Q: A series motor having a series field resistance of 0.25 2 and an armature resistance of 0.1552 is…

A: In this question we will find back emf of dc series motor..

Q: Determine the efficiency and the output horse-power of a 3-phase, 400-V induction motor running…

A: Motor running light at 400VInput current=15APower taken=2000WFriction,Windage,Rotor Core…

Q: A 4-pole, DC shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720…

Q: A 50 hp, 220 V shunt motor operating at 1200 rpm draws a line current of 94 A when operating at…

Q: A dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The…

A: As two questions are different so iam solving only one question i.e 1st question. take ratio of back…

Q: A dc shunt motor runs at 900 rpm. from a 400 V supply when taking an armature current of 25 A.…

A: Sol: - N1= 900 rpm, V1= 400V Ia1 = 25A , Ra = 0.8 Ω Eb1 = V1 - Ia1 Ra1 = 400 –(25*0.8) Eb1 = 380 V…

Q: A6-pole, 24 KW, 120 V, DC machine has a Duplex LAP-woundarmature which has 72 coils with 10 turns…

A: Given data, P=4VT=120 VPout=21.5 kW

Q: A 240 V d.c. shunt motor runs at 700 r.p.m. ,takes 12kW. Find resistance to be added to the field…

A: First calculate back emf before and after external field resistance is inserted. Now take the ratio…

Q: Ia (A) 0.30 N (RPM) S.NO IL(A) 0.08 T(mNm) 84 P(watts) 10.9 1 1233 2 0.20 0.40 1217 203 25.9 3 0.26…

Q: n eight-pole, 24 KW, 120 V, DC machine has a Duplex LAP-wound armature which has 80 coils with 10…

Q: shunt generator delivers 1,000 W at 115 V to a load. If the armature resistance is 0 Ω, and the…

A: In this question we will find shunt field current in shunt generator....

Q: A belt-driven 0.16 MW shunt-wound DC generator is running at 460 rpm and is supplying full load to a…

A: find the back emfs in both cases (i.e generating mode and motoring mode) and tage the ratio of back…

Q: A 4-pole 250-V, d.c. series motor has a wave-wound armature with 496 conductors. Calculate (a) the…

A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

Q: A 500 V shunt motor running at 720 rpm takes an armature current of 50 Amp,its effective resistance…

Q: A DC series motor having a resistance of 0.4 o and runs at 2000 rpm when connected to 250 V supply…

Q: A 350 V shunt motor runs at it's normal speed of 720 r/min when the armature current is 90 A. The…

A: According to the question we have to find the value of the (1) The kΦ1 of the motor. If armature…

Q: A DC series motor having a resistance of 0.4 ꭥ and runs at 2000 rpm when connected to 250 V supply…

A: In DC series motor, field, and armature winding connected in series so flux is directly proportional…

Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

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

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 2 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 squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is the horsepower output of the motor?
The speed of a 230 V shunt motor is to be reduced from 900 r.p.m to 600 r.p.m. Theresistance of the armature circuit is 0.3 ohm. When the motor current is 30 A, speedis 900 r.p.m. If the current reduces to 20 A at lower speed, what arrangement shouldbe made? Neglect any effect not included in the data given. (Ans.3.833 ohms)
A 240V shunt motor, running on no-load and at normal speed, takes an armature current of 2.4 A froma 240Vsupply. The resistance of the field circuit is 240Ω, and that of the armature is 0.25Ω. Calculatethe motor output power and efficiency when drawing a line current of 35 A from the supply
A belt-driven 0.16 MW shunt-wound DC generator is running at 460 rpm and is supplying full load to a bus bar at 230 V. At what speed will it run if the belt breaks and the machine continues to run taking 9 kW from the bus bar? The armature and the field resistances are 0.05 Ohm and 100 Ohms respectively. The brush contact drop is 2 Volts per brush.
A belt-driven 100-kW, shunt generator running at 300 RPM on 220-V busbars continues to run as a motor when the belt breaks, then taking 10 kW. What will be its speed when the armature resistance = 0.025 ohms, field resistance = 60 ohms and contact drop under each brush = 1 V? Assume the flux deteriorates by 25% when ran as a motor.
8.) A 25-kW shunt generator is delivering full output to 400-V bus-bars and is driven at 950 r.p.m. by belt drive. The belt breaks suddenly but the machine continues to run as a motor taking 25 kW from the busbars. At what speed does it run ? Take armature resistance including brush contact resistance as 0.5 Ω and field resistance as 160 Ω.
12. A d.c. shunt motor runs at 900 r.p.m. from a 400 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. Theresistance 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 400 V.
A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?
DC/AC MOTOR (UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATIONS NEEDED. ANSWER IN 2 DECIMAL PLACES. BOX THE FINAL ANSWER.) A 200V shunt motor develops 23hp, when taking 20.2 kW. The field resistance is 50 ohms and the armature resistance is 0.06 ohm. What are the rotational losses? a. 1125 W b. 1667 W c. 917 W d. 825 W
The speed of a 230 V shunt motor is to be reduced from 900 r.p.m to 600 r.p.m. The resistance of the armature circuit is 0.3 ohm. When the motor current is 30 A, speed is 900 r.p.m. If the current reduces to 20 A at lower speed, what arrangement should be made? Neglect any effect not included in the data given.
Please Do not Designed 15 Kw Please Must Show Given Questions in Design for 11KW Motor . A15 kW, 440 V, 4-pole, 50 Hz, 3-phase induction motor is built with a stator bore 0.25 m and a core length of 0.16. The specific electric loading is 23000 ampere conductors/meter. Using the data of this machine, determine the core dimensions, number of stator slots and number of stator conductors for 11 kW, 460 V, 6 pole, 50 Hz motor. Assume a full-load efficiency of 84% and power factor of 0.82 for each machine.the Winding Factor is 0.955.
A 500 V, lap wound d.c. A shunt motor has 90 slots and each has 8 conductors. When the motor delivers full load it draws a current of 30/ A from the line. The field and armature resistances are 250 ohm and 0.4 ohm respectively. If the fixed resistance is 27.1 mWh, find the speed of the motor and the torque produced.