A DC series motor is running with a speed of 800 RPM, while taking a current of 20A from the supply. If the load is changed such that the current drawn by motor is increased to 50 A. Calculate the speed of the motor on new load. The armature and series field winding resistance are 0.2Ω and 0.3Ω respectively. Assume the flux produced is proportional to the current. Assume supply voltage is 250V.

Q: Q2/ A d.c. series motor is running whith a speed of 800 r.p.m. while taking a current of 20 A from…

A: A DC series motor , field winding series with the armature winding.    If Speed N=800rpm drawn…

Q: A 440 V d.c. Armature resistance of shunt motor is 0.25 Ω and field winding resistance is 220 Ω. A…

A: Solution: Given data; V =440 v, Armature resistance Ra=0.25 Ω, shunt resistance Rsh=220 Ω, Load…

Q: A series DC generator has an output voltage of 200 volts, an armature resistance of 0.070 and an…

A: Consider the formula for the EMF is. E=V+IR Here, R is the combined resistance of field winding and…

Q: A DC motor takes an armature current of 100 A at 440 V. The armature circuit resistance is 0.3 0.…

A: Given a DC motor with, Armature current, Ia=100 A Terminal voltage, V=440 V Armature resistance,…

Q: The current flows in the windings of the DC machine which causes the O Ohmic loss O Eddy current…

A: Given :    Generally DC machines are those circuits which will converts the electrical energy into…

Q: A DC generator feeds a load of current 20 A and voltage 220 V. Calculate the electrical motive force…

A: Load current IL= 20 A Load Voltage VL = 220 V Resistance of armature Ra= 0.02 Resistance of field…

Q: A Series Motor has an Armature Resistance of 0.2 and a Series Field Resistance of 0.3 ohm. It is…

A: Need to find back EMF of motor

Q: A DO shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field…

A: Given values are - IL=45AVt=220VRa=0.01ohmRsh=44ohmStray losses=375W

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…

A:

Q: A mechanical load of 0.5n moved by a 12 v linear motor with movable member of 0.2 meter long moving…

A: i) For the steady-state condition, the force on the mechanical load should be balanced. The force…

Q: The armature of a shunt generator has 0.08-ohm effective resistance. Each brush has an effective…

A: In a shunt generator is having, Armature resistance, Ra=0.08 Ω. Resistance of each brush, Rb=0.02 Ω…

Q: .A 230 V dc series motor has Ra=0.22, Rf=0.12. The motor draw 40A at rated speed and 1000 RPM. Find…

A:

Q: Which of the following statements are true? I-If an alternating current is applied to a winding, an…

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

Q: The factors effecting the speed of dc motor are The flux p and the voltage across the armature The…

A: The factor affecting the speed of the dc motor is as follows; N=V-Ia RaϕN= speed of dc…

Q: A 6-pole series motor takes 40 A from the supply mains at 220 V. It has 600 lap-wound conductors.…

A: The formula for back emf in case of DC series motor is given by, Eb=V-Ia(Ra+Rse) Where, Eb: Back EMF…

Q: The torque developed by a dc series motor is 44 N-m when drawing 17 A. If the current is doubled,…

A:

Q: 5. URS Electrician has a 25 kW series generator used in street lighting has an efficiency of 85 8…

A:

Q: Q3: A universal fractional horsepower series motor has a resistance of 30 Q and a total inductance…

A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…

Q: The field winding of a d.c. motor is connected to a 110V supply. At a temperature of 18°C, the…

A: We need to find out temperature for given condition . First we will find out the resistance for both…

Q: The DC shunt generator with the terminal voltage 300 V, armature drop 7 V and the each brush drop 4…

A: In this we will find emf..

Q: Q- The armature resistance of a permanent magnet dc motor is 0.80. At no load, the motor draws 1.5 A…

A:

Q: A DC generator has eight poles, wound as lap then rewound as a wave, calculate the electrical motive…

A: In this question,  DC Generator ,  Number of pole P= 8,   Number of conductors Z= 240 Flux = 0.04wb…

Q: Find the mechanical speeds in revolutions per minute of a multipole electrical machine, if the…

A: In this question,  If the frequency f= 50Hz. Find the speed N?  We know N= 120f/P

Q: Q- The armature resistance of a permanent magnet dc motor is 0.80. At no load, the motor draws 1.5 A…

A: Given- Armature resistance- Ra=0.8 Ω, Current- Ia=3.5 A, supply voltage V=25 V, speed=1500 RPM, To…

Q: A dc series generator is supplying a current of 5 A to a certain load. The terminal voltage is 500…

A:

Q: The hysteresis loss of a dc machine is 300 W when the flux per pole is 30 mWb and the machine is…

A:

Q: A 220 V DC Machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 ohm. If the…

A: Given a 220 V DC machine, As a generator: Armature current, Ia=20 A Terminal voltage, V = 200 V…

Q: The armature of a shunt generator has 0.05 ohm effective resistance. Each brush has an effective…

A: It is given that: Ra=0.05 ΩRb=2×0.01 Ω=0.02 ΩVt=100 VIL=40 A

Q: Q3: A universal fractional horsepower series motor has a resistance of 30 2 and a total inductance…

A: Given data: Resistance:30 ohm Total inductance: 0.5H DC voltage: 250V current: 0.8A r.p.m : 2000

Q: 57. One of those listed is not a type of de generator winding A drum D. lap B progressive C. gramme…

A: 1)  The correct answer is magnetic starter. Explanation: It is a device originated to supply power…

Q: Ohmic loss

A:

Q: A direct current shunt dynamo continuously supplies an ohmic load of 50 Ohm at terminal voltage Vt=…

A:

Q: The field winding of a d.c. motor is connected to a 110V supply. At a temperature of 18°C, the…

A: Given: Voltage, V=110V At a temperature of 18°C, the current drawn is 0.575 A. T1=18° and I1=0.575A…

Q: A shunt generator delivers 1,000 W at 149 V to a load. If the armature resistance is 0 ohm, and the…

A:

Q: Suppose there is a load that needs 120W of power and is located 50ft from a generator with a total…

A: Given data Load = 120 W V1 = 12 V V1 = 120 V Total resistance = R = 0.2525 Ohms Lenght = 50

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.