2. 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? 3. The armature of a dc machine running at 1200 rpm carries 45 A in current. If the induced armature voltage is 130 v, what is the torque developed by the armature?

Q: A 6-pole, 24 KW, 120 V, DC machine has a triplex LAP-wound armature which has 72 coils with 10 turns…

A: Given A 6-pole, 24 KW, 120 V, DC machine has a triplex LAP-wound armature which has 72 coils with 10…

Q: A shunt motor on a 240- V line has an armature current of 75 A. If the field- circuit resistance is…

A:

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: The armature of a dc machine running at 1200 rpm carries 45 A in current. If the induced armature…

A: Given: N=1200 rpmIa=45AEa=130V

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

A:

Q: 2. A 25 kW shunt machine having an Armature circuit Resistance of 0.4 2 and a filed resistance of…

A: In this dc machine is given..We have to find out efficiency when machine acts as generator and…

Q: A 8-pole d.c. motor has a wave-wound armature with 870 conductors. The useful flux per pole is 46…

A: According to the question we have to calculate the value of Torque.

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

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

A:

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: Q2/ The open circuit voltage of a separately excited de generator when running at a constant speed…

A: Initial speed of the generator (N1) = 2000 r.p.m The generated e.m.f, Eg1 = 122 V Load voltage (V) =…

Q: a dc machine runs no load with a speed of 200 rad/s. The applied armature voltage is Va = 120 V. At…

A:

Q: The current in a conductor on the armature of a dc motor is 300A. The flux under the poles is…

A:

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

A:

Q: 1.) a)Determine the type of DC Machine that can be utilized in traction purposes and locomotives on…

A:

Q: A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 0. If the armature…

A: We need to find out the speed for given motor.

Q: .Find the torque when armature current is halved a. 20 N-m b. 5 N-m c. 40 N-m d. 10 N-m

A:

Q: At what speed, in rpm, must the armature of a dc machine run to develop 572.4 kW at a torque of 4605…

A: GivenPower developed by motor=572.4 KWTorque=4605 n-m

Q: The electromagnetic torque developed in a DC machine is 80 Nm for an armature current of 30 A. What…

A: Solution: Given:  The electromagnetic torque developed in a DC machine is 80 Nm for an armature…

Q: A DC motor has the following specifications: 10 hp, 37.5 A, 230 V; flux / pole = 0.01 Wb, number of…

A: back  emf Eb = flux per pole×speed of the machine×total number of conductors60×number of polesnumber…

Q: A 20 kW shunt machine having an Armature circuit Resistance of 0.5 N and a filed resistance of 1200,…

A: Draw the circuit diagram for the DC shunt generator.

Q: Asap, select the best answer In dc machine, which among the parts converts the AC voltage into its…

A: In this question,  We need to choose the correct options In dc machine, which among the parts…

Q: The torque developed by a dc motor is 30 Nm when the armature current is 25 A. If the flux is…

A: Initial torque T1=30 Nm. Initial armature current Ia1=25 A. Let initial flux is ϕ1. Flux is reduced…

Q: 1.4 A dc series motor draws 300 A from a 750 V supply when deliveri at 950 r/min. The field and…

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

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

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Q: A 6-pole, 24 KW, 120V, DC machine has a Duplex LAP-wound armature which has 72 coils with 10 turns…

A: Given data, P=6Pout=24 kWVT=120 VNm=2400 rpm Duplex lap wound armature, with 72 coils with 10 turns…

Q: 2. A 15 kW shunt machine having an Armature circuit Resistance of 0.35 and a filed resistance of…

A:

Q: A DC motor takes an armature current of 130 A at 460 V. The armature circuit resistance is 0.4 Q.…

A: Given that: Armature current, Ia=130 A Voltage, V= 460 volt Armature resistance, Ra=0.4 ohm Pole,…

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: Q6 a d.c. shunt machine while running as generator develops a voltage 250 V at 100 r.p.m. at…

A:

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: The armature of a d.c. The machine has a resistance of 0.25 ohm and is connected to a 300V supply.…

A:

Q: QUESTION 1 a) Write down three (3) factors that will determine the induced torque in a DC machine.…

A: “Since you have asked multiple questions, we will solve the first question for you. If youwant any…

Q: A 4 pole lap wound dc machine has 728 active conductors running at 1800 rpm. The flux per pole is…

A:

Q: Calculate the torque in N-m exerted by a motor with 100 conductors, 5 inches long, on the armature…

A: Given Data: N = 100 conductors L = 5 inches field of intensity  = 50,000 lines per inch square  I =…

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.