A 240 V d.c. shunt motor runs at 700 r.p.m. ,takes 12kW. Find resistance to be added to the field circuit to increase speed to 1100 r.p.m. at an armature current of 75 A. Assume flux proportional to field current. Armature resistance = 0.18 Ώ and field winding resistance is 200 Ώ?

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A: Here  DC shunt motor is given and we have to find developed torque  and useful torque

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A: As per Bartleby guidelines we are allowed to solve only one question, please ask the rest again.

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

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Q: A d.c. shunt motor is running with certain load. For constant torque, the effect of adding an…

A: As per the guidelines of Bartleby we supposed to answer 1st question only since the 2nd question 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.…

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Q: Q2) A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding…

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

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Q: A 4 pole, (01*10)V, DC shunt motor operates on a load current (1*10)A, having wave connected…

A: Given: V= 10 IL= 10 A Z=200 flux per pole = 25 mwb Rsh=1 ohm Ra= 0.15 ohm

Q: (1) What is the armature current IA for EA= (A-10)V (2) What is new value of EAnew, at C/5 percent…

A: RA=0.25Ω ;VT=A=436 V ;EA1=A-10=426V ;1 IA1=?  for  EA=A-10 C=7, ∴C/5=7/5=1.4% decrease ∴ϕ2=0.986ϕ1 2…

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A: DC machines (Generator/ Motor) are the important parts of electrical drives. These machines are used…

Q: A 240 V, 4 pole wave wound dc shunt motor has 600 conductors on its armature. It has an armature…

A: Given, A DC shunt motor has V=240 VP=4 A=2  wave woundZ=600Ra=0.7 ΩE=210 Vϕ=10 mWb

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A: The solution is attached below.

Q: d.c. shunt motor

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A: The power flow diagram of a three phase induction motor is shown below,

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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

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A: We need to Find armature current and generated voltage. Solution is attached below

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A: Eddy current loss can be minimized by laminating the armature core of dc generator.

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.